(reland) cc: Refactor layer/tile manager unittest to extract common code.

cc/layers/picture_layer_impl_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/picture_layer_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <limits>
@@ skipping 12 matching lines @@
 #include "cc/test/fake_content_layer_client.h"
 #include "cc/test/fake_impl_task_runner_provider.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 #include "cc/test/fake_output_surface.h"
 #include "cc/test/fake_picture_layer_impl.h"
 #include "cc/test/fake_raster_source.h"
 #include "cc/test/fake_recording_source.h"
 #include "cc/test/geometry_test_utils.h"
 #include "cc/test/gpu_rasterization_enabled_settings.h"
 #include "cc/test/layer_test_common.h"
+#include "cc/test/test_layer_tree_host_base.h"
 #include "cc/test/test_shared_bitmap_manager.h"
 #include "cc/test/test_task_graph_runner.h"
 #include "cc/test/test_web_graphics_context_3d.h"
 #include "cc/tiles/tiling_set_raster_queue_all.h"
 #include "cc/tiles/tiling_set_raster_queue_required.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 #include "ui/gfx/geometry/size_conversions.h"
 
 namespace cc {
 namespace {
 
-#define EXPECT_BOTH_EQ(expression, x)         \
-  do {                                        \
-    EXPECT_EQ(x, pending_layer_->expression); \
-    EXPECT_EQ(x, active_layer_->expression);  \
+#define EXPECT_BOTH_EQ(expression, x)          \
+  do {                                         \
+    EXPECT_EQ(x, pending_layer()->expression); \
+    EXPECT_EQ(x, active_layer()->expression);  \
   } while (false)
 
-#define EXPECT_BOTH_NE(expression, x)         \
-  do {                                        \
-    EXPECT_NE(x, pending_layer_->expression); \
-    EXPECT_NE(x, active_layer_->expression);  \
+#define EXPECT_BOTH_NE(expression, x)          \
+  do {                                         \
+    EXPECT_NE(x, pending_layer()->expression); \
+    EXPECT_NE(x, active_layer()->expression);  \
   } while (false)
 
-#define EXPECT_BOTH_TRUE(expression)         \
-  do {                                       \
-    EXPECT_TRUE(pending_layer_->expression); \
-    EXPECT_TRUE(active_layer_->expression);  \
+#define EXPECT_BOTH_TRUE(expression)          \
+  do {                                        \
+    EXPECT_TRUE(pending_layer()->expression); \
+    EXPECT_TRUE(active_layer()->expression);  \
   } while (false)
 
-#define EXPECT_BOTH_FALSE(expression)         \
-  do {                                        \
-    EXPECT_FALSE(pending_layer_->expression); \
-    EXPECT_FALSE(active_layer_->expression);  \
+#define EXPECT_BOTH_FALSE(expression)          \
+  do {                                         \
+    EXPECT_FALSE(pending_layer()->expression); \
+    EXPECT_FALSE(active_layer()->expression);  \
   } while (false)
 
 class MockCanvas : public SkCanvas {
  public:
   explicit MockCanvas(int w, int h) : SkCanvas(w, h) {}
 
   void onDrawRect(const SkRect& rect, const SkPaint& paint) override {
     // Capture calls before SkCanvas quickReject() kicks in.
     rects_.push_back(rect);
   }
 
   std::vector<SkRect> rects_;
 };
 
-class PictureLayerImplTestSettings : public GpuRasterizationEnabledSettings {
+class PictureLayerImplTest : public TestLayerTreeHostBase {
  public:
-  PictureLayerImplTestSettings() {
-    layer_transforms_should_scale_layer_contents = true;
-    verify_clip_tree_calculations = true;
-  }
-};
-
-class NoLowResTilingsSettings : public PictureLayerImplTestSettings {};
-
-class LowResTilingsSettings : public PictureLayerImplTestSettings {
- public:
-  LowResTilingsSettings() { create_low_res_tiling = true; }
-};
-
-class PictureLayerImplTest : public testing::Test {
- public:
-  explicit PictureLayerImplTest(const LayerTreeSettings& settings)
-      : task_runner_provider_(base::ThreadTaskRunnerHandle::Get()),
-        output_surface_(FakeOutputSurface::Create3d()),
-        host_impl_(settings,
-                   &task_runner_provider_,
-                   &shared_bitmap_manager_,
-                   &task_graph_runner_),
-        root_id_(6),
-        id_(7),
-        pending_layer_(nullptr),
-        old_pending_layer_(nullptr),
-        active_layer_(nullptr) {
-    host_impl_.SetViewportSize(gfx::Size(10000, 10000));
+  void SetUp() override {
+    TestLayerTreeHostBase::SetUp();
+    host_impl()->SetViewportSize(gfx::Size(10000, 10000));
   }
 
-  PictureLayerImplTest() : PictureLayerImplTest(LowResTilingsSettings()) {}
-
-  ~PictureLayerImplTest() override {}
-
-  void SetUp() override { InitializeRenderer(); }
-
-  virtual void InitializeRenderer() {
-    host_impl_.SetVisible(true);
-    host_impl_.InitializeRenderer(output_surface_.get());
-  }
-
-  void SetupDefaultTrees(const gfx::Size& layer_bounds) {
-    scoped_refptr<FakeRasterSource> pending_raster_source =
-        FakeRasterSource::CreateFilled(layer_bounds);
-    scoped_refptr<FakeRasterSource> active_raster_source =
-        FakeRasterSource::CreateFilled(layer_bounds);
-
-    SetupTrees(pending_raster_source, active_raster_source);
-  }
-
-  void SetupDefaultTreesWithInvalidation(const gfx::Size& layer_bounds,
-                                         const Region& invalidation) {
-    scoped_refptr<FakeRasterSource> pending_raster_source =
-        FakeRasterSource::CreateFilled(layer_bounds);
-    scoped_refptr<FakeRasterSource> active_raster_source =
-        FakeRasterSource::CreateFilled(layer_bounds);
-
-    SetupTreesWithInvalidation(pending_raster_source, active_raster_source,
-                               invalidation);
-  }
-
-  void RebuildPropertyTreesOnPendingTree() {
-    host_impl_.pending_tree()->property_trees()->needs_rebuild = true;
-    host_impl_.pending_tree()->BuildPropertyTreesForTesting();
-  }
-
-  void ActivateTree() {
-    RebuildPropertyTreesOnPendingTree();
-    host_impl_.ActivateSyncTree();
-    CHECK(!host_impl_.pending_tree());
-    CHECK(host_impl_.recycle_tree());
-    old_pending_layer_ = pending_layer_;
-    pending_layer_ = nullptr;
-    active_layer_ = static_cast<FakePictureLayerImpl*>(
-        host_impl_.active_tree()->LayerById(id_));
-
-    bool update_lcd_text = false;
-    host_impl_.active_tree()->UpdateDrawProperties(update_lcd_text);
+  LayerTreeSettings CreateSettings() override {
+    LayerTreeSettings settings;
+    settings.gpu_rasterization_enabled = true;
+    settings.layer_transforms_should_scale_layer_contents = true;
+    settings.create_low_res_tiling = true;
+    settings.verify_clip_tree_calculations = true;
+    return settings;
   }
 
   void SetupDefaultTreesWithFixedTileSize(const gfx::Size& layer_bounds,
                                           const gfx::Size& tile_size,
                                           const Region& invalidation) {
     scoped_refptr<FakeRasterSource> pending_raster_source =
         FakeRasterSource::CreateFilled(layer_bounds);
     scoped_refptr<FakeRasterSource> active_raster_source =
         FakeRasterSource::CreateFilled(layer_bounds);
 
-    SetupTreesWithFixedTileSize(pending_raster_source, active_raster_source,
-                                tile_size, invalidation);
-  }
-
-  void SetupTrees(scoped_refptr<RasterSource> pending_raster_source,
-                  scoped_refptr<RasterSource> active_raster_source) {
-    SetupPendingTree(active_raster_source);
-    ActivateTree();
-    SetupPendingTreeInternal(pending_raster_source, gfx::Size(), Region());
-  }
-
-  void SetupTreesWithInvalidation(
-      scoped_refptr<RasterSource> pending_raster_source,
-      scoped_refptr<RasterSource> active_raster_source,
-      const Region& pending_invalidation) {
-    SetupPendingTreeInternal(active_raster_source, gfx::Size(), Region());
-    ActivateTree();
-    SetupPendingTreeInternal(pending_raster_source, gfx::Size(),
-                             pending_invalidation);
+    SetupTreesWithFixedTileSize(std::move(pending_raster_source),
+                                std::move(active_raster_source), tile_size,
+                                invalidation);
   }
 
   void SetupTreesWithFixedTileSize(
       scoped_refptr<RasterSource> pending_raster_source,
       scoped_refptr<RasterSource> active_raster_source,
       const gfx::Size& tile_size,
       const Region& pending_invalidation) {
-    SetupPendingTreeInternal(active_raster_source, tile_size, Region());
+    SetupPendingTree(std::move(active_raster_source), tile_size, Region());
     ActivateTree();
-    SetupPendingTreeInternal(pending_raster_source, tile_size,
-                             pending_invalidation);
+    SetupPendingTree(std::move(pending_raster_source), tile_size,
+                     pending_invalidation);
   }
 
-  void SetupPendingTree(scoped_refptr<RasterSource> raster_source) {
-    SetupPendingTreeInternal(raster_source, gfx::Size(), Region());
+  void SetupDefaultTreesWithInvalidation(const gfx::Size& layer_bounds,
+                                         const Region& invalidation) {
+    scoped_refptr<FakeRasterSource> pending_raster_source =
+        FakeRasterSource::CreateFilled(layer_bounds);
+    scoped_refptr<FakeRasterSource> active_raster_source =
+        FakeRasterSource::CreateFilled(layer_bounds);
+
+    SetupTreesWithInvalidation(std::move(pending_raster_source),
+                               std::move(active_raster_source), invalidation);
+  }
+
+  void SetupTreesWithInvalidation(
+      scoped_refptr<RasterSource> pending_raster_source,
+      scoped_refptr<RasterSource> active_raster_source,
+      const Region& pending_invalidation) {
+    SetupPendingTree(std::move(active_raster_source), gfx::Size(), Region());
+    ActivateTree();
+    SetupPendingTree(std::move(pending_raster_source), gfx::Size(),
+                     pending_invalidation);
   }
 
   void SetupPendingTreeWithInvalidation(
       scoped_refptr<RasterSource> raster_source,
       const Region& invalidation) {
-    SetupPendingTreeInternal(raster_source, gfx::Size(), invalidation);
+    SetupPendingTree(std::move(raster_source), gfx::Size(), invalidation);
   }
 
   void SetupPendingTreeWithFixedTileSize(
       scoped_refptr<RasterSource> raster_source,
       const gfx::Size& tile_size,
       const Region& invalidation) {
-    SetupPendingTreeInternal(raster_source, tile_size, invalidation);
-  }
-
-  void SetupPendingTreeInternal(scoped_refptr<RasterSource> raster_source,
-                                const gfx::Size& tile_size,
-                                const Region& invalidation) {
-    host_impl_.CreatePendingTree();
-    host_impl_.pending_tree()->PushPageScaleFromMainThread(1.f, 0.00001f,
-                                                           100000.f);
-    LayerTreeImpl* pending_tree = host_impl_.pending_tree();
-    pending_tree->SetDeviceScaleFactor(
-        host_impl_.active_tree()->device_scale_factor());
-
-    // Steal from the recycled tree if possible.
-    LayerImpl* pending_root = pending_tree->root_layer();
-    std::unique_ptr<FakePictureLayerImpl> pending_layer;
-    DCHECK(!pending_root || pending_root->id() == root_id_);
-    if (!pending_root) {
-      std::unique_ptr<LayerImpl> new_pending_root =
-          LayerImpl::Create(pending_tree, root_id_);
-      pending_layer = FakePictureLayerImpl::Create(pending_tree, id_);
-      if (!tile_size.IsEmpty())
-        pending_layer->set_fixed_tile_size(tile_size);
-      pending_layer->SetDrawsContent(true);
-      pending_layer->SetScrollClipLayer(new_pending_root->id());
-      pending_root = new_pending_root.get();
-      pending_tree->SetRootLayer(std::move(new_pending_root));
-    } else {
-      pending_layer.reset(static_cast<FakePictureLayerImpl*>(
-          pending_root->RemoveChildForTesting(pending_root->children()[0])
-              .release()));
-      if (!tile_size.IsEmpty())
-        pending_layer->set_fixed_tile_size(tile_size);
-    }
-    pending_root->test_properties()->force_render_surface = true;
-    // The bounds() just mirror the raster source size.
-    pending_layer->SetBounds(raster_source->GetSize());
-    pending_layer->SetRasterSourceOnPending(raster_source, invalidation);
-
-    pending_root->AddChild(std::move(pending_layer));
-    pending_tree->SetViewportLayersFromIds(
-        Layer::INVALID_ID, pending_tree->root_layer()->id(), Layer::INVALID_ID,
-        Layer::INVALID_ID);
-
-    pending_layer_ = static_cast<FakePictureLayerImpl*>(
-        host_impl_.pending_tree()->LayerById(id_));
-
-    // Add tilings/tiles for the layer.
-    bool update_lcd_text = false;
-    RebuildPropertyTreesOnPendingTree();
-    host_impl_.pending_tree()->UpdateDrawProperties(update_lcd_text);
+    SetupPendingTree(std::move(raster_source), tile_size, invalidation);
   }
 
   void SetupDrawProperties(FakePictureLayerImpl* layer,
                            float ideal_contents_scale,
                            float device_scale_factor,
                            float page_scale_factor,
                            float maximum_animation_contents_scale,
                            float starting_animation_contents_scale,
                            bool animating_transform_to_screen) {
     layer->layer_tree_impl()->SetDeviceScaleFactor(device_scale_factor);
-    host_impl_.active_tree()->SetPageScaleOnActiveTree(page_scale_factor);
+    host_impl()->active_tree()->SetPageScaleOnActiveTree(page_scale_factor);
 
     gfx::Transform scale_transform;
     scale_transform.Scale(ideal_contents_scale, ideal_contents_scale);
     layer->draw_properties().target_space_transform = scale_transform;
     layer->set_is_drawn_render_surface_layer_list_member(true);
     DCHECK_EQ(layer->GetIdealContentsScale(), ideal_contents_scale);
     layer->draw_properties().maximum_animation_contents_scale =
         maximum_animation_contents_scale;
     layer->draw_properties().starting_animation_contents_scale =
         starting_animation_contents_scale;
@@ skipping 32 matching lines @@
     }
   }
 
   void SetContentsScaleOnBothLayers(float contents_scale,
                                     float device_scale_factor,
                                     float page_scale_factor,
                                     float maximum_animation_contents_scale,
                                     float starting_animation_contents_scale,
                                     bool animating_transform) {
     SetupDrawPropertiesAndUpdateTiles(
-        pending_layer_, contents_scale, device_scale_factor, page_scale_factor,
+        pending_layer(), contents_scale, device_scale_factor, page_scale_factor,
         maximum_animation_contents_scale, starting_animation_contents_scale,
         animating_transform);
 
     SetupDrawPropertiesAndUpdateTiles(
-        active_layer_, contents_scale, device_scale_factor, page_scale_factor,
+        active_layer(), contents_scale, device_scale_factor, page_scale_factor,
         maximum_animation_contents_scale, starting_animation_contents_scale,
         animating_transform);
   }
 
   void ResetTilingsAndRasterScales() {
-    if (pending_layer_) {
-      pending_layer_->ReleaseResources();
-      EXPECT_FALSE(pending_layer_->tilings());
-      pending_layer_->RecreateResources();
-      EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
+    if (pending_layer()) {
+      pending_layer()->ReleaseResources();
+      EXPECT_FALSE(pending_layer()->tilings());
+      pending_layer()->RecreateResources();
+      EXPECT_EQ(0u, pending_layer()->tilings()->num_tilings());
     }
 
-    if (active_layer_) {
-      active_layer_->ReleaseResources();
-      EXPECT_FALSE(active_layer_->tilings());
-      active_layer_->RecreateResources();
-      EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
+    if (active_layer()) {
+      active_layer()->ReleaseResources();
+      EXPECT_FALSE(active_layer()->tilings());
+      active_layer()->RecreateResources();
+      EXPECT_EQ(0u, active_layer()->tilings()->num_tilings());
     }
   }
 
   size_t NumberOfTilesRequired(PictureLayerTiling* tiling) {
     size_t num_required = 0;
     std::vector<Tile*> tiles = tiling->AllTilesForTesting();
     for (size_t i = 0; i < tiles.size(); ++i) {
       if (tiles[i]->required_for_activation())
         num_required++;
     }
@@ skipping 10 matching lines @@
   void AssertNoTilesRequired(PictureLayerTiling* tiling) {
     std::vector<Tile*> tiles = tiling->AllTilesForTesting();
     for (size_t i = 0; i < tiles.size(); ++i)
       EXPECT_FALSE(tiles[i]->required_for_activation()) << "i: " << i;
     EXPECT_GT(tiles.size(), 0u);
   }
 
   void SetInitialDeviceScaleFactor(float device_scale_factor) {
     // Device scale factor is a per-tree property. However, tests can't directly
     // set the pending tree's device scale factor before the pending tree is
-    // created, and setting it after SetupPendingTreeInternal is too late, since
+    // created, and setting it after SetupPendingTreeis too late, since
     // draw properties will already have been updated on the tree. To handle
     // this, we initially set only the active tree's device scale factor, and we
-    // copy this over to the pending tree inside SetupPendingTreeInternal.
-    host_impl_.active_tree()->SetDeviceScaleFactor(device_scale_factor);
+    // copy this over to the pending tree inside SetupPendingTree.
+    host_impl()->active_tree()->SetDeviceScaleFactor(device_scale_factor);
   }
 
- protected:
   void TestQuadsForSolidColor(bool test_for_solid);
-
-  FakeImplTaskRunnerProvider task_runner_provider_;
-  TestSharedBitmapManager shared_bitmap_manager_;
-  TestTaskGraphRunner task_graph_runner_;
-  std::unique_ptr<OutputSurface> output_surface_;
-  FakeLayerTreeHostImpl host_impl_;
-  int root_id_;
-  int id_;
-  FakePictureLayerImpl* pending_layer_;
-  FakePictureLayerImpl* old_pending_layer_;
-  FakePictureLayerImpl* active_layer_;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(PictureLayerImplTest);
 };
 
 class NoLowResPictureLayerImplTest : public PictureLayerImplTest {
  public:
-  NoLowResPictureLayerImplTest()
-      : PictureLayerImplTest(NoLowResTilingsSettings()) {}
+  LayerTreeSettings CreateSettings() override {
+    LayerTreeSettings settings = PictureLayerImplTest::CreateSettings();
+    settings.create_low_res_tiling = false;
+    return settings;
+  }
 };
 
 TEST_F(PictureLayerImplTest, TileGridAlignment) {
   // Layer to span 4 raster tiles in x and in y
   LayerTreeSettings settings;
   gfx::Size layer_size(settings.default_tile_size.width() * 7 / 2,
                        settings.default_tile_size.height() * 7 / 2);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_size);
 
   // Create an active recording source, but make sure it's not solid.
   std::unique_ptr<FakeRecordingSource> active_recording_source =
       FakeRecordingSource::CreateFilledRecordingSource(layer_size);
   active_recording_source->SetLayerBounds(layer_size);
   active_recording_source->add_draw_rect(gfx::Rect(layer_size));
   active_recording_source->add_draw_rect(
       gfx::Rect(0, 0, layer_size.width() - 1, layer_size.height() - 1));
   active_recording_source->Rerecord();
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreateFromRecordingSource(active_recording_source.get(),
                                                   false);
 
   SetupTrees(pending_raster_source, active_raster_source);
 
   // Add 1x1 rects at the centers of each tile, then re-record recording source
   // contents.
-  active_layer_->tilings()->tiling_at(0)->CreateAllTilesForTesting();
+  active_layer()->tilings()->tiling_at(0)->CreateAllTilesForTesting();
   std::vector<Tile*> tiles =
-      active_layer_->tilings()->tiling_at(0)->AllTilesForTesting();
+      active_layer()->tilings()->tiling_at(0)->AllTilesForTesting();
   EXPECT_EQ(16u, tiles.size());
   std::vector<SkRect> rects;
   std::vector<Tile*>::const_iterator tile_iter;
   active_recording_source->reset_draws();
   for (tile_iter = tiles.begin(); tile_iter < tiles.end(); tile_iter++) {
     gfx::Point tile_center = (*tile_iter)->content_rect().CenterPoint();
     gfx::Rect rect(tile_center.x(), tile_center.y(), 1, 1);
     active_recording_source->add_draw_rect(rect);
     rects.push_back(SkRect::MakeXYWH(rect.x(), rect.y(), 1, 1));
   }
@@ skipping 21 matching lines @@
     EXPECT_EQ(1u, mock_canvas.rects_.size());
     EXPECT_EQ(*rect_iter, mock_canvas.rects_[0]);
     rect_iter++;
   }
 }
 
 TEST_F(PictureLayerImplTest, CloneNoInvalidation) {
   gfx::Size layer_bounds(400, 400);
   SetupDefaultTrees(layer_bounds);
 
-  EXPECT_EQ(pending_layer_->tilings()->num_tilings(),
-            active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(pending_layer()->tilings()->num_tilings(),
+            active_layer()->tilings()->num_tilings());
 
-  const PictureLayerTilingSet* tilings = pending_layer_->tilings();
+  const PictureLayerTilingSet* tilings = pending_layer()->tilings();
   EXPECT_GT(tilings->num_tilings(), 0u);
   for (size_t i = 0; i < tilings->num_tilings(); ++i)
     EXPECT_TRUE(tilings->tiling_at(i)->AllTilesForTesting().empty());
 }
 
 TEST_F(PictureLayerImplTest, ExternalViewportRectForPrioritizingTiles) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
   gfx::Size layer_bounds(400, 400);
   SetupDefaultTrees(layer_bounds);
 
-  SetupDrawPropertiesAndUpdateTiles(active_layer_, 1.f, 1.f, 1.f, 1.f, 0.f,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(), 1.f, 1.f, 1.f, 1.f, 0.f,
                                     false);
 
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
 
   // Update tiles with viewport for tile priority as (0, 0, 100, 100) and the
   // identify transform for tile priority.
   gfx::Rect viewport_rect_for_tile_priority = gfx::Rect(0, 0, 100, 100);
   gfx::Transform transform, transform_for_tile_priority;
 
-  host_impl_.SetExternalTilePriorityConstraints(viewport_rect_for_tile_priority,
-                                                transform_for_tile_priority);
+  host_impl()->SetExternalTilePriorityConstraints(
+      viewport_rect_for_tile_priority, transform_for_tile_priority);
   bool update_lcd_text = false;
-  host_impl_.active_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->active_tree()->UpdateDrawProperties(update_lcd_text);
 
   gfx::Rect viewport_rect_for_tile_priority_in_view_space =
       viewport_rect_for_tile_priority;
 
   // Verify the viewport rect for tile priority is used in picture layer tiling.
   EXPECT_EQ(viewport_rect_for_tile_priority_in_view_space,
-            active_layer_->viewport_rect_for_tile_priority_in_content_space());
-  PictureLayerTilingSet* tilings = active_layer_->tilings();
+            active_layer()->viewport_rect_for_tile_priority_in_content_space());
+  PictureLayerTilingSet* tilings = active_layer()->tilings();
   for (size_t i = 0; i < tilings->num_tilings(); i++) {
     PictureLayerTiling* tiling = tilings->tiling_at(i);
     EXPECT_EQ(
         tiling->GetCurrentVisibleRectForTesting(),
         gfx::ScaleToEnclosingRect(viewport_rect_for_tile_priority_in_view_space,
                                   tiling->contents_scale()));
   }
 
   // Update tiles with viewport for tile priority as (200, 200, 100, 100) in
   // screen space and the transform for tile priority is translated and
   // rotated. The actual viewport for tile priority used by PictureLayerImpl
   // should be (200, 200, 100, 100) applied with the said transform.
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
 
   viewport_rect_for_tile_priority = gfx::Rect(200, 200, 100, 100);
   transform_for_tile_priority.Translate(100, 100);
   transform_for_tile_priority.Rotate(45);
-  host_impl_.SetExternalTilePriorityConstraints(viewport_rect_for_tile_priority,
-                                                transform_for_tile_priority);
-  host_impl_.active_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->SetExternalTilePriorityConstraints(
+      viewport_rect_for_tile_priority, transform_for_tile_priority);
+  host_impl()->active_tree()->UpdateDrawProperties(update_lcd_text);
 
   gfx::Transform screen_to_view(gfx::Transform::kSkipInitialization);
   bool success = transform_for_tile_priority.GetInverse(&screen_to_view);
   EXPECT_TRUE(success);
 
   // Note that we don't clip this to the layer bounds, since it is expected that
   // the rect will sometimes be outside of the layer bounds. If we clip to
   // bounds, then tile priorities will end up being incorrect in cases of fully
   // offscreen layer.
   viewport_rect_for_tile_priority_in_view_space =
       MathUtil::ProjectEnclosingClippedRect(screen_to_view,
                                             viewport_rect_for_tile_priority);
 
   EXPECT_EQ(viewport_rect_for_tile_priority_in_view_space,
-            active_layer_->viewport_rect_for_tile_priority_in_content_space());
-  tilings = active_layer_->tilings();
+            active_layer()->viewport_rect_for_tile_priority_in_content_space());
+  tilings = active_layer()->tilings();
   for (size_t i = 0; i < tilings->num_tilings(); i++) {
     PictureLayerTiling* tiling = tilings->tiling_at(i);
     EXPECT_EQ(
         tiling->GetCurrentVisibleRectForTesting(),
         gfx::ScaleToEnclosingRect(viewport_rect_for_tile_priority_in_view_space,
                                   tiling->contents_scale()));
   }
 }
 
 TEST_F(PictureLayerImplTest, ViewportRectForTilePriorityIsCached) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
   gfx::Size layer_bounds(400, 400);
   SetupDefaultTrees(layer_bounds);
 
-  SetupDrawPropertiesAndUpdateTiles(active_layer_, 1.f, 1.f, 1.f, 1.f, 0.f,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(), 1.f, 1.f, 1.f, 1.f, 0.f,
                                     false);
 
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
 
   gfx::Rect viewport_rect_for_tile_priority(0, 0, 100, 100);
   gfx::Transform transform_for_tile_priority;
 
-  host_impl_.SetExternalTilePriorityConstraints(viewport_rect_for_tile_priority,
-                                                transform_for_tile_priority);
+  host_impl()->SetExternalTilePriorityConstraints(
+      viewport_rect_for_tile_priority, transform_for_tile_priority);
   bool update_lcd_text = false;
-  host_impl_.active_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->active_tree()->UpdateDrawProperties(update_lcd_text);
 
   EXPECT_EQ(viewport_rect_for_tile_priority,
-            active_layer_->viewport_rect_for_tile_priority_in_content_space());
+            active_layer()->viewport_rect_for_tile_priority_in_content_space());
 
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
 
   gfx::Rect another_viewport_rect_for_tile_priority(11, 11, 50, 50);
-  host_impl_.SetExternalTilePriorityConstraints(
+  host_impl()->SetExternalTilePriorityConstraints(
       another_viewport_rect_for_tile_priority, transform_for_tile_priority);
 
   // Didn't call UpdateDrawProperties yet. The viewport rect for tile priority
   // should remain to be the previously cached value.
   EXPECT_EQ(viewport_rect_for_tile_priority,
-            active_layer_->viewport_rect_for_tile_priority_in_content_space());
-  host_impl_.active_tree()->UpdateDrawProperties(update_lcd_text);
+            active_layer()->viewport_rect_for_tile_priority_in_content_space());
+  host_impl()->active_tree()->UpdateDrawProperties(update_lcd_text);
 
   // Now the UpdateDrawProperties is called. The viewport rect for tile
   // priority should be the latest value.
   EXPECT_EQ(another_viewport_rect_for_tile_priority,
-            active_layer_->viewport_rect_for_tile_priority_in_content_space());
+            active_layer()->viewport_rect_for_tile_priority_in_content_space());
 }
 
 TEST_F(PictureLayerImplTest, ClonePartialInvalidation) {
   gfx::Size layer_bounds(400, 400);
   gfx::Rect layer_invalidation(150, 200, 30, 180);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   scoped_refptr<FakeRasterSource> lost_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   SetupPendingTreeWithFixedTileSize(lost_raster_source, gfx::Size(50, 50),
                                     Region());
   ActivateTree();
   // Add a unique tiling on the active tree.
-  PictureLayerTiling* tiling = active_layer_->AddTiling(3.f);
+  PictureLayerTiling* tiling = active_layer()->AddTiling(3.f);
   tiling->set_resolution(HIGH_RESOLUTION);
   tiling->CreateAllTilesForTesting();
 
   // Ensure UpdateTiles won't remove any tilings.
-  active_layer_->MarkAllTilingsUsed();
+  active_layer()->MarkAllTilingsUsed();
 
   // Then setup a new pending tree and activate it.
   SetupTreesWithFixedTileSize(pending_raster_source, active_raster_source,
                               gfx::Size(50, 50), layer_invalidation);
 
-  EXPECT_EQ(1u, pending_layer_->num_tilings());
-  EXPECT_EQ(3u, active_layer_->num_tilings());
+  EXPECT_EQ(1u, pending_layer()->num_tilings());
+  EXPECT_EQ(3u, active_layer()->num_tilings());
 
-  const PictureLayerTilingSet* tilings = pending_layer_->tilings();
+  const PictureLayerTilingSet* tilings = pending_layer()->tilings();
   EXPECT_GT(tilings->num_tilings(), 0u);
   for (size_t i = 0; i < tilings->num_tilings(); ++i) {
     const PictureLayerTiling* tiling = tilings->tiling_at(i);
     gfx::Rect content_invalidation = gfx::ScaleToEnclosingRect(
         layer_invalidation,
         tiling->contents_scale());
     auto prioritized_tiles =
         tiling->UpdateAndGetAllPrioritizedTilesForTesting();
     for (PictureLayerTiling::CoverageIterator iter(
              tiling,
              tiling->contents_scale(),
              gfx::Rect(tiling->tiling_size()));
          iter;
          ++iter) {
       // We don't always have a tile, but when we do it's because it was
       // invalidated and it has the latest raster source.
       if (*iter) {
         EXPECT_FALSE(iter.geometry_rect().IsEmpty());
         EXPECT_EQ(pending_raster_source.get(),
                   prioritized_tiles[*iter].raster_source());
         EXPECT_TRUE(iter.geometry_rect().Intersects(content_invalidation));
       } else {
         // We don't create tiles in non-invalidated regions.
         EXPECT_FALSE(iter.geometry_rect().Intersects(content_invalidation));
       }
     }
   }
 
-  tilings = active_layer_->tilings();
+  tilings = active_layer()->tilings();
   EXPECT_GT(tilings->num_tilings(), 0u);
   for (size_t i = 0; i < tilings->num_tilings(); ++i) {
     const PictureLayerTiling* tiling = tilings->tiling_at(i);
     gfx::Rect content_invalidation =
         gfx::ScaleToEnclosingRect(layer_invalidation, tiling->contents_scale());
     auto prioritized_tiles =
         tiling->UpdateAndGetAllPrioritizedTilesForTesting();
     for (PictureLayerTiling::CoverageIterator iter(
              tiling,
              tiling->contents_scale(),
@@ skipping 13 matching lines @@
   gfx::Size layer_bounds(300, 500);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   SetupTreesWithInvalidation(pending_raster_source, active_raster_source,
                              gfx::Rect(layer_bounds));
 
-  EXPECT_EQ(pending_layer_->tilings()->num_tilings(),
-            active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(pending_layer()->tilings()->num_tilings(),
+            active_layer()->tilings()->num_tilings());
 
-  const PictureLayerTilingSet* tilings = pending_layer_->tilings();
+  const PictureLayerTilingSet* tilings = pending_layer()->tilings();
   EXPECT_GT(tilings->num_tilings(), 0u);
   for (size_t i = 0; i < tilings->num_tilings(); ++i) {
     VerifyAllPrioritizedTilesExistAndHaveRasterSource(
         tilings->tiling_at(i), pending_raster_source.get());
   }
 }
 
 TEST_F(PictureLayerImplTest, UpdateTilesCreatesTilings) {
   gfx::Size layer_bounds(1300, 1900);
   SetupDefaultTrees(layer_bounds);
 
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  float low_res_factor = host_impl()->settings().low_res_contents_scale_factor;
   EXPECT_LT(low_res_factor, 1.f);
 
-  active_layer_->ReleaseResources();
-  EXPECT_FALSE(active_layer_->tilings());
-  active_layer_->RecreateResources();
-  EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
+  active_layer()->ReleaseResources();
+  EXPECT_FALSE(active_layer()->tilings());
+  active_layer()->RecreateResources();
+  EXPECT_EQ(0u, active_layer()->tilings()->num_tilings());
 
-  SetupDrawPropertiesAndUpdateTiles(active_layer_,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(),
                                     6.f,  // ideal contents scale
                                     3.f,  // device scale
                                     2.f,  // page scale
                                     1.f,  // maximum animation scale
                                     0.f,  // starting animation scale
                                     false);
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  ASSERT_EQ(2u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(6.f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+                  active_layer()->tilings()->tiling_at(0)->contents_scale());
   EXPECT_FLOAT_EQ(6.f * low_res_factor,
-                  active_layer_->tilings()->tiling_at(1)->contents_scale());
+                  active_layer()->tilings()->tiling_at(1)->contents_scale());
 
   // If we change the page scale factor, then we should get new tilings.
-  SetupDrawPropertiesAndUpdateTiles(active_layer_,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(),
                                     6.6f,  // ideal contents scale
                                     3.f,   // device scale
                                     2.2f,  // page scale
                                     1.f,   // maximum animation scale
                                     0.f,   // starting animation scale
                                     false);
-  ASSERT_EQ(4u, active_layer_->tilings()->num_tilings());
+  ASSERT_EQ(4u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(6.6f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+                  active_layer()->tilings()->tiling_at(0)->contents_scale());
   EXPECT_FLOAT_EQ(6.6f * low_res_factor,
-                  active_layer_->tilings()->tiling_at(2)->contents_scale());
+                  active_layer()->tilings()->tiling_at(2)->contents_scale());
 
   // If we change the device scale factor, then we should get new tilings.
-  SetupDrawPropertiesAndUpdateTiles(active_layer_,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(),
                                     7.26f,  // ideal contents scale
                                     3.3f,   // device scale
                                     2.2f,   // page scale
                                     1.f,    // maximum animation scale
                                     0.f,    // starting animation scale
                                     false);
-  ASSERT_EQ(6u, active_layer_->tilings()->num_tilings());
+  ASSERT_EQ(6u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(7.26f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+                  active_layer()->tilings()->tiling_at(0)->contents_scale());
   EXPECT_FLOAT_EQ(7.26f * low_res_factor,
-                  active_layer_->tilings()->tiling_at(3)->contents_scale());
+                  active_layer()->tilings()->tiling_at(3)->contents_scale());
 
   // If we change the device scale factor, but end up at the same total scale
   // factor somehow, then we don't get new tilings.
-  SetupDrawPropertiesAndUpdateTiles(active_layer_,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(),
                                     7.26f,  // ideal contents scale
                                     2.2f,   // device scale
                                     3.3f,   // page scale
                                     1.f,    // maximum animation scale
                                     0.f,    // starting animation scale
                                     false);
-  ASSERT_EQ(6u, active_layer_->tilings()->num_tilings());
+  ASSERT_EQ(6u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(7.26f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+                  active_layer()->tilings()->tiling_at(0)->contents_scale());
   EXPECT_FLOAT_EQ(7.26f * low_res_factor,
-                  active_layer_->tilings()->tiling_at(3)->contents_scale());
+                  active_layer()->tilings()->tiling_at(3)->contents_scale());
 }
 
 TEST_F(PictureLayerImplTest, PendingLayerOnlyHasHighResTiling) {
   gfx::Size layer_bounds(1300, 1900);
   SetupDefaultTrees(layer_bounds);
 
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  float low_res_factor = host_impl()->settings().low_res_contents_scale_factor;
   EXPECT_LT(low_res_factor, 1.f);
 
-  pending_layer_->ReleaseResources();
-  EXPECT_FALSE(pending_layer_->tilings());
-  pending_layer_->RecreateResources();
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
+  pending_layer()->ReleaseResources();
+  EXPECT_FALSE(pending_layer()->tilings());
+  pending_layer()->RecreateResources();
+  EXPECT_EQ(0u, pending_layer()->tilings()->num_tilings());
 
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(),
                                     6.f,  // ideal contents scale
                                     3.f,  // device scale
                                     2.f,  // page scale
                                     1.f,  // maximum animation scale
                                     0.f,  // starting animation scale
                                     false);
-  ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, pending_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(6.f,
-                  pending_layer_->tilings()->tiling_at(0)->contents_scale());
+                  pending_layer()->tilings()->tiling_at(0)->contents_scale());
 
   // If we change the page scale factor, then we should get new tilings.
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(),
                                     6.6f,  // ideal contents scale
                                     3.f,   // device scale
                                     2.2f,  // page scale
                                     1.f,   // maximum animation scale
                                     0.f,   // starting animation scale
                                     false);
-  ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, pending_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(6.6f,
-                  pending_layer_->tilings()->tiling_at(0)->contents_scale());
+                  pending_layer()->tilings()->tiling_at(0)->contents_scale());
 
   // If we change the device scale factor, then we should get new tilings.
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(),
                                     7.26f,  // ideal contents scale
                                     3.3f,   // device scale
                                     2.2f,   // page scale
                                     1.f,    // maximum animation scale
                                     0.f,    // starting animation scale
                                     false);
-  ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, pending_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(7.26f,
-                  pending_layer_->tilings()->tiling_at(0)->contents_scale());
+                  pending_layer()->tilings()->tiling_at(0)->contents_scale());
 
   // If we change the device scale factor, but end up at the same total scale
   // factor somehow, then we don't get new tilings.
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(),
                                     7.26f,  // ideal contents scale
                                     2.2f,   // device scale
                                     3.3f,   // page scale
                                     1.f,    // maximum animation scale
                                     0.f,    // starting animation scale
                                     false);
-  ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, pending_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(7.26f,
-                  pending_layer_->tilings()->tiling_at(0)->contents_scale());
+                  pending_layer()->tilings()->tiling_at(0)->contents_scale());
 }
 
 TEST_F(PictureLayerImplTest, CreateTilingsEvenIfTwinHasNone) {
   // This test makes sure that if a layer can have tilings, then a commit makes
   // it not able to have tilings (empty size), and then a future commit that
   // makes it valid again should be able to create tilings.
   gfx::Size layer_bounds(1300, 1900);
 
   scoped_refptr<FakeRasterSource> empty_raster_source =
       FakeRasterSource::CreateEmpty(layer_bounds);
   scoped_refptr<FakeRasterSource> valid_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   SetupPendingTree(valid_raster_source);
-  ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, pending_layer()->tilings()->num_tilings());
 
   ActivateTree();
   SetupPendingTree(empty_raster_source);
-  EXPECT_FALSE(pending_layer_->CanHaveTilings());
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
-  ASSERT_EQ(0u, pending_layer_->tilings()->num_tilings());
+  EXPECT_FALSE(pending_layer()->CanHaveTilings());
+  ASSERT_EQ(2u, active_layer()->tilings()->num_tilings());
+  ASSERT_EQ(0u, pending_layer()->tilings()->num_tilings());
 
   ActivateTree();
-  EXPECT_FALSE(active_layer_->CanHaveTilings());
-  ASSERT_EQ(0u, active_layer_->tilings()->num_tilings());
+  EXPECT_FALSE(active_layer()->CanHaveTilings());
+  ASSERT_EQ(0u, active_layer()->tilings()->num_tilings());
 
   SetupPendingTree(valid_raster_source);
-  ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
-  ASSERT_EQ(0u, active_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, pending_layer()->tilings()->num_tilings());
+  ASSERT_EQ(0u, active_layer()->tilings()->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, LowResTilingStaysOnActiveTree) {
   gfx::Size layer_bounds(1300, 1900);
 
   scoped_refptr<FakeRasterSource> valid_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   scoped_refptr<FakeRasterSource> other_valid_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   SetupPendingTree(valid_raster_source);
-  ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, pending_layer()->tilings()->num_tilings());
 
   ActivateTree();
   SetupPendingTree(other_valid_raster_source);
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
-  ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(2u, active_layer()->tilings()->num_tilings());
+  ASSERT_EQ(1u, pending_layer()->tilings()->num_tilings());
   auto* low_res_tiling =
-      active_layer_->tilings()->FindTilingWithResolution(LOW_RESOLUTION);
+      active_layer()->tilings()->FindTilingWithResolution(LOW_RESOLUTION);
   EXPECT_TRUE(low_res_tiling);
 
   ActivateTree();
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  ASSERT_EQ(2u, active_layer()->tilings()->num_tilings());
   auto* other_low_res_tiling =
-      active_layer_->tilings()->FindTilingWithResolution(LOW_RESOLUTION);
+      active_layer()->tilings()->FindTilingWithResolution(LOW_RESOLUTION);
   EXPECT_TRUE(other_low_res_tiling);
   EXPECT_EQ(low_res_tiling, other_low_res_tiling);
 }
 
 TEST_F(PictureLayerImplTest, ZoomOutCrash) {
   gfx::Size layer_bounds(1300, 1900);
 
   // Set up the high and low res tilings before pinch zoom.
   SetupDefaultTrees(layer_bounds);
   ResetTilingsAndRasterScales();
-  EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(0u, active_layer()->tilings()->num_tilings());
   SetContentsScaleOnBothLayers(32.0f, 1.0f, 32.0f, 1.0f, 0.f, false);
-  EXPECT_EQ(32.f, active_layer_->HighResTiling()->contents_scale());
-  host_impl_.PinchGestureBegin();
+  EXPECT_EQ(32.f, active_layer()->HighResTiling()->contents_scale());
+  host_impl()->PinchGestureBegin();
   SetContentsScaleOnBothLayers(1.0f, 1.0f, 1.0f, 1.0f, 0.f, false);
   SetContentsScaleOnBothLayers(1.0f, 1.0f, 1.0f, 1.0f, 0.f, false);
-  EXPECT_EQ(active_layer_->tilings()->NumHighResTilings(), 1);
+  EXPECT_EQ(active_layer()->tilings()->NumHighResTilings(), 1);
 }
 
 TEST_F(PictureLayerImplTest, PinchGestureTilings) {
   gfx::Size layer_bounds(1300, 1900);
 
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  float low_res_factor = host_impl()->settings().low_res_contents_scale_factor;
   // Set up the high and low res tilings before pinch zoom.
   SetupDefaultTrees(layer_bounds);
   ResetTilingsAndRasterScales();
 
   SetContentsScaleOnBothLayers(2.f, 1.0f, 2.f, 1.0f, 0.f, false);
-  EXPECT_EQ(active_layer_->num_tilings(), 2u);
-  EXPECT_EQ(pending_layer_->num_tilings(), 1u);
-  EXPECT_EQ(active_layer_->tilings()->tiling_at(0)->contents_scale(), 2.f);
-  EXPECT_EQ(active_layer_->tilings()->tiling_at(1)->contents_scale(),
+  EXPECT_EQ(active_layer()->num_tilings(), 2u);
+  EXPECT_EQ(pending_layer()->num_tilings(), 1u);
+  EXPECT_EQ(active_layer()->tilings()->tiling_at(0)->contents_scale(), 2.f);
+  EXPECT_EQ(active_layer()->tilings()->tiling_at(1)->contents_scale(),
             2.f * low_res_factor);
   // One of the tilings has to be a low resolution one.
   EXPECT_EQ(LOW_RESOLUTION,
-            active_layer_->tilings()->tiling_at(1)->resolution());
+            active_layer()->tilings()->tiling_at(1)->resolution());
 
   // Ensure UpdateTiles won't remove any tilings.
-  active_layer_->MarkAllTilingsUsed();
+  active_layer()->MarkAllTilingsUsed();
 
   // Start a pinch gesture.
-  host_impl_.PinchGestureBegin();
+  host_impl()->PinchGestureBegin();
 
   // Zoom out by a small amount. We should create a tiling at half
   // the scale (2/kMaxScaleRatioDuringPinch).
   SetContentsScaleOnBothLayers(1.8f, 1.0f, 1.8f, 1.0f, 0.f, false);
-  EXPECT_EQ(3u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(3u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(2.0f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+                  active_layer()->tilings()->tiling_at(0)->contents_scale());
   EXPECT_FLOAT_EQ(1.0f,
-                  active_layer_->tilings()->tiling_at(1)->contents_scale());
+                  active_layer()->tilings()->tiling_at(1)->contents_scale());
   EXPECT_FLOAT_EQ(2.0f * low_res_factor,
-                  active_layer_->tilings()->tiling_at(2)->contents_scale());
+                  active_layer()->tilings()->tiling_at(2)->contents_scale());
   // Since we're pinching, we shouldn't create a low resolution tiling.
   EXPECT_FALSE(
-      active_layer_->tilings()->FindTilingWithResolution(LOW_RESOLUTION));
+      active_layer()->tilings()->FindTilingWithResolution(LOW_RESOLUTION));
 
   // Ensure UpdateTiles won't remove any tilings.
-  active_layer_->MarkAllTilingsUsed();
+  active_layer()->MarkAllTilingsUsed();
 
   // Zoom out further, close to our low-res scale factor. We should
   // use that tiling as high-res, and not create a new tiling.
   SetContentsScaleOnBothLayers(low_res_factor * 2.1f, 1.0f,
                                low_res_factor * 2.1f, 1.0f, 0.f, false);
-  EXPECT_EQ(3u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(3u, active_layer()->tilings()->num_tilings());
   EXPECT_FALSE(
-      active_layer_->tilings()->FindTilingWithResolution(LOW_RESOLUTION));
+      active_layer()->tilings()->FindTilingWithResolution(LOW_RESOLUTION));
 
   // Zoom in a lot now. Since we increase by increments of
   // kMaxScaleRatioDuringPinch, this will create a new tiling at 4.0.
   SetContentsScaleOnBothLayers(3.8f, 1.0f, 3.8f, 1.f, 0.f, false);
-  EXPECT_EQ(4u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(4u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(4.0f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+                  active_layer()->tilings()->tiling_at(0)->contents_scale());
   // Although one of the tilings matches the low resolution scale, it still
   // shouldn't be marked as low resolution since we're pinching.
   auto* low_res_tiling =
-      active_layer_->tilings()->FindTilingWithScale(4.f * low_res_factor);
+      active_layer()->tilings()->FindTilingWithScale(4.f * low_res_factor);
   EXPECT_TRUE(low_res_tiling);
   EXPECT_NE(LOW_RESOLUTION, low_res_tiling->resolution());
 
   // Stop a pinch gesture.
-  host_impl_.PinchGestureEnd();
+  host_impl()->PinchGestureEnd();
 
   // Ensure UpdateTiles won't remove any tilings.
-  active_layer_->MarkAllTilingsUsed();
+  active_layer()->MarkAllTilingsUsed();
 
   // After pinch ends, set the scale to what the raster scale was updated to
   // (checked above).
   SetContentsScaleOnBothLayers(4.0f, 1.0f, 4.0f, 1.f, 0.f, false);
-  EXPECT_EQ(4u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(4u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(4.0f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+                  active_layer()->tilings()->tiling_at(0)->contents_scale());
   // Now that we stopped pinching, the low resolution tiling that existed should
   // now be marked as low resolution.
   low_res_tiling =
-      active_layer_->tilings()->FindTilingWithScale(4.f * low_res_factor);
+      active_layer()->tilings()->FindTilingWithScale(4.f * low_res_factor);
   EXPECT_TRUE(low_res_tiling);
   EXPECT_EQ(LOW_RESOLUTION, low_res_tiling->resolution());
 }
 
 TEST_F(PictureLayerImplTest, SnappedTilingDuringZoom) {
   gfx::Size layer_bounds(2600, 3800);
   SetupDefaultTrees(layer_bounds);
 
   ResetTilingsAndRasterScales();
-  EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(0u, active_layer()->tilings()->num_tilings());
 
   // Set up the high and low res tilings before pinch zoom.
   SetContentsScaleOnBothLayers(0.24f, 1.0f, 0.24f, 1.0f, 0.f, false);
-  EXPECT_EQ(2u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(2u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(0.24f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+                  active_layer()->tilings()->tiling_at(0)->contents_scale());
   EXPECT_FLOAT_EQ(0.0625f,
-                  active_layer_->tilings()->tiling_at(1)->contents_scale());
+                  active_layer()->tilings()->tiling_at(1)->contents_scale());
 
   // Ensure UpdateTiles won't remove any tilings.
-  active_layer_->MarkAllTilingsUsed();
+  active_layer()->MarkAllTilingsUsed();
 
   // Start a pinch gesture.
-  host_impl_.PinchGestureBegin();
+  host_impl()->PinchGestureBegin();
 
   // Zoom out by a small amount. We should create a tiling at half
   // the scale (1/kMaxScaleRatioDuringPinch).
   SetContentsScaleOnBothLayers(0.2f, 1.0f, 0.2f, 1.0f, 0.f, false);
-  EXPECT_EQ(3u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(3u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(0.24f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+                  active_layer()->tilings()->tiling_at(0)->contents_scale());
   EXPECT_FLOAT_EQ(0.12f,
-                  active_layer_->tilings()->tiling_at(1)->contents_scale());
+                  active_layer()->tilings()->tiling_at(1)->contents_scale());
   EXPECT_FLOAT_EQ(0.0625,
-                  active_layer_->tilings()->tiling_at(2)->contents_scale());
+                  active_layer()->tilings()->tiling_at(2)->contents_scale());
 
   // Ensure UpdateTiles won't remove any tilings.
-  active_layer_->MarkAllTilingsUsed();
+  active_layer()->MarkAllTilingsUsed();
 
   // Zoom out further, close to our low-res scale factor. We should
   // use that tiling as high-res, and not create a new tiling.
   SetContentsScaleOnBothLayers(0.1f, 1.0f, 0.1f, 1.0f, 0.f, false);
-  EXPECT_EQ(3u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(3u, active_layer()->tilings()->num_tilings());
 
   // Zoom in. 0.25(desired_scale) should be snapped to 0.24 during zoom-in
   // because 0.25(desired_scale) is within the ratio(1.2).
   SetContentsScaleOnBothLayers(0.25f, 1.0f, 0.25f, 1.0f, 0.f, false);
-  EXPECT_EQ(3u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(3u, active_layer()->tilings()->num_tilings());
 
   // Zoom in a lot. Since we move in factors of two, we should get a scale that
   // is a power of 2 times 0.24.
   SetContentsScaleOnBothLayers(1.f, 1.0f, 1.f, 1.0f, 0.f, false);
-  EXPECT_EQ(4u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(4u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(1.92f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+                  active_layer()->tilings()->tiling_at(0)->contents_scale());
 }
 
 TEST_F(PictureLayerImplTest, CleanUpTilings) {
   gfx::Size layer_bounds(1300, 1900);
 
   std::vector<PictureLayerTiling*> used_tilings;
 
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  float low_res_factor = host_impl()->settings().low_res_contents_scale_factor;
   EXPECT_LT(low_res_factor, 1.f);
 
   float scale = 1.f;
   float page_scale = 1.f;
 
   SetupDefaultTrees(layer_bounds);
-  EXPECT_EQ(2u, active_layer_->tilings()->num_tilings());
-  EXPECT_EQ(1.f, active_layer_->HighResTiling()->contents_scale());
+  EXPECT_EQ(2u, active_layer()->tilings()->num_tilings());
+  EXPECT_EQ(1.f, active_layer()->HighResTiling()->contents_scale());
 
   // Ensure UpdateTiles won't remove any tilings. Note this is unrelated to
-  // |used_tilings| variable, and it's here only to ensure that active_layer_
+  // |used_tilings| variable, and it's here only to ensure that active_layer()
   // won't remove tilings before the test has a chance to verify behavior.
-  active_layer_->MarkAllTilingsUsed();
+  active_layer()->MarkAllTilingsUsed();
 
   // We only have ideal tilings, so they aren't removed.
   used_tilings.clear();
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  EXPECT_EQ(2u, active_layer_->tilings()->num_tilings());
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  EXPECT_EQ(2u, active_layer()->tilings()->num_tilings());
 
-  host_impl_.PinchGestureBegin();
+  host_impl()->PinchGestureBegin();
 
   // Changing the ideal but not creating new tilings.
   scale = 1.5f;
   page_scale = 1.5f;
   SetContentsScaleOnBothLayers(scale, 1.f, page_scale, 1.f, 0.f, false);
-  EXPECT_EQ(2u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(2u, active_layer()->tilings()->num_tilings());
 
   // The tilings are still our target scale, so they aren't removed.
   used_tilings.clear();
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(2u, active_layer()->tilings()->num_tilings());
 
-  host_impl_.PinchGestureEnd();
+  host_impl()->PinchGestureEnd();
 
   // Create a 1.2 scale tiling. Now we have 1.0 and 1.2 tilings. Ideal = 1.2.
   scale = 1.2f;
   page_scale = 1.2f;
   SetContentsScaleOnBothLayers(1.2f, 1.f, page_scale, 1.f, 0.f, false);
-  ASSERT_EQ(4u, active_layer_->tilings()->num_tilings());
-  EXPECT_FLOAT_EQ(
-      1.f,
-      active_layer_->tilings()->tiling_at(1)->contents_scale());
-  EXPECT_FLOAT_EQ(
-      1.f * low_res_factor,
-      active_layer_->tilings()->tiling_at(3)->contents_scale());
+  ASSERT_EQ(4u, active_layer()->tilings()->num_tilings());
+  EXPECT_FLOAT_EQ(1.f,
+                  active_layer()->tilings()->tiling_at(1)->contents_scale());
+  EXPECT_FLOAT_EQ(1.f * low_res_factor,
+                  active_layer()->tilings()->tiling_at(3)->contents_scale());
 
   // Ensure UpdateTiles won't remove any tilings.
-  active_layer_->MarkAllTilingsUsed();
+  active_layer()->MarkAllTilingsUsed();
 
   // Mark the non-ideal tilings as used. They won't be removed.
   used_tilings.clear();
-  used_tilings.push_back(active_layer_->tilings()->tiling_at(1));
-  used_tilings.push_back(active_layer_->tilings()->tiling_at(3));
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(4u, active_layer_->tilings()->num_tilings());
+  used_tilings.push_back(active_layer()->tilings()->tiling_at(1));
+  used_tilings.push_back(active_layer()->tilings()->tiling_at(3));
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(4u, active_layer()->tilings()->num_tilings());
 
   // Now move the ideal scale to 0.5. Our target stays 1.2.
   SetContentsScaleOnBothLayers(0.5f, 1.f, page_scale, 1.f, 0.f, false);
 
   // The high resolution tiling is between target and ideal, so is not
   // removed.  The low res tiling for the old ideal=1.0 scale is removed.
   used_tilings.clear();
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(3u, active_layer_->tilings()->num_tilings());
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(3u, active_layer()->tilings()->num_tilings());
 
   // Now move the ideal scale to 1.0. Our target stays 1.2.
   SetContentsScaleOnBothLayers(1.f, 1.f, page_scale, 1.f, 0.f, false);
 
   // All the tilings are between are target and the ideal, so they are not
   // removed.
   used_tilings.clear();
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(3u, active_layer_->tilings()->num_tilings());
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(3u, active_layer()->tilings()->num_tilings());
 
   // Now move the ideal scale to 1.1 on the active layer. Our target stays 1.2.
-  SetupDrawPropertiesAndUpdateTiles(active_layer_, 1.1f, 1.f, page_scale, 1.f,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(), 1.1f, 1.f, page_scale, 1.f,
                                     0.f, false);
 
   // Because the pending layer's ideal scale is still 1.0, our tilings fall
   // in the range [1.0,1.2] and are kept.
   used_tilings.clear();
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(3u, active_layer_->tilings()->num_tilings());
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(3u, active_layer()->tilings()->num_tilings());
 
   // Move the ideal scale on the pending layer to 1.1 as well. Our target stays
   // 1.2 still.
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.1f, 1.f, page_scale, 1.f,
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(), 1.1f, 1.f, page_scale, 1.f,
                                     0.f, false);
 
   // Our 1.0 tiling now falls outside the range between our ideal scale and our
   // target raster scale. But it is in our used tilings set, so nothing is
   // deleted.
   used_tilings.clear();
-  used_tilings.push_back(active_layer_->tilings()->tiling_at(1));
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(3u, active_layer_->tilings()->num_tilings());
+  used_tilings.push_back(active_layer()->tilings()->tiling_at(1));
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(3u, active_layer()->tilings()->num_tilings());
 
   // If we remove it from our used tilings set, it is outside the range to keep
   // so it is deleted.
   used_tilings.clear();
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(2u, active_layer()->tilings()->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, DontAddLowResDuringAnimation) {
   // Make sure this layer covers multiple tiles, since otherwise low
   // res won't get created because it is too small.
-  gfx::Size tile_size(host_impl_.settings().default_tile_size);
+  gfx::Size tile_size(host_impl()->settings().default_tile_size);
   // Avoid max untiled layer size heuristics via fixed tile size.
   gfx::Size layer_bounds(tile_size.width() + 1, tile_size.height() + 1);
   SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, Region());
 
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  float low_res_factor = host_impl()->settings().low_res_contents_scale_factor;
   float contents_scale = 1.f;
   float device_scale = 1.f;
   float page_scale = 1.f;
   float maximum_animation_scale = 1.f;
   float starting_animation_scale = 0.f;
   bool animating_transform = true;
 
   ResetTilingsAndRasterScales();
 
   // Animating, so don't create low res even if there isn't one already.
   SetContentsScaleOnBothLayers(contents_scale, device_scale, page_scale,
                                maximum_animation_scale,
                                starting_animation_scale, animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 1.f);
   EXPECT_BOTH_EQ(num_tilings(), 1u);
 
   // Stop animating, low res gets created.
   animating_transform = false;
   SetContentsScaleOnBothLayers(contents_scale, device_scale, page_scale,
                                maximum_animation_scale,
                                starting_animation_scale, animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 1.f);
-  EXPECT_EQ(active_layer_->LowResTiling()->contents_scale(), low_res_factor);
-  EXPECT_EQ(active_layer_->num_tilings(), 2u);
-  EXPECT_EQ(pending_layer_->num_tilings(), 1u);
+  EXPECT_EQ(active_layer()->LowResTiling()->contents_scale(), low_res_factor);
+  EXPECT_EQ(active_layer()->num_tilings(), 2u);
+  EXPECT_EQ(pending_layer()->num_tilings(), 1u);
 
   // Ensure UpdateTiles won't remove any tilings.
-  active_layer_->MarkAllTilingsUsed();
+  active_layer()->MarkAllTilingsUsed();
 
   // Page scale animation, new high res, but no low res. We still have
   // a tiling at the previous scale, it's just not marked as low res on the
   // active layer. The pending layer drops non-ideal tilings.
   contents_scale = 2.f;
   page_scale = 2.f;
   maximum_animation_scale = 2.f;
   animating_transform = true;
   SetContentsScaleOnBothLayers(contents_scale, device_scale, page_scale,
                                maximum_animation_scale,
                                starting_animation_scale, animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 2.f);
-  EXPECT_FALSE(active_layer_->LowResTiling());
-  EXPECT_FALSE(pending_layer_->LowResTiling());
-  EXPECT_EQ(3u, active_layer_->num_tilings());
-  EXPECT_EQ(1u, pending_layer_->num_tilings());
+  EXPECT_FALSE(active_layer()->LowResTiling());
+  EXPECT_FALSE(pending_layer()->LowResTiling());
+  EXPECT_EQ(3u, active_layer()->num_tilings());
+  EXPECT_EQ(1u, pending_layer()->num_tilings());
 
   // Stop animating, new low res gets created for final page scale.
   animating_transform = false;
   SetContentsScaleOnBothLayers(contents_scale, device_scale, page_scale,
                                maximum_animation_scale,
                                starting_animation_scale, animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 2.f);
-  EXPECT_EQ(active_layer_->LowResTiling()->contents_scale(),
+  EXPECT_EQ(active_layer()->LowResTiling()->contents_scale(),
             2.f * low_res_factor);
-  EXPECT_EQ(4u, active_layer_->num_tilings());
-  EXPECT_EQ(1u, pending_layer_->num_tilings());
+  EXPECT_EQ(4u, active_layer()->num_tilings());
+  EXPECT_EQ(1u, pending_layer()->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, DontAddLowResForSmallLayers) {
-  gfx::Size layer_bounds(host_impl_.settings().default_tile_size);
+  gfx::Size layer_bounds(host_impl()->settings().default_tile_size);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   SetupTrees(pending_raster_source, active_raster_source);
 
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  float low_res_factor = host_impl()->settings().low_res_contents_scale_factor;
   float device_scale = 1.f;
   float page_scale = 1.f;
   float maximum_animation_scale = 1.f;
   float starting_animation_scale = 0.f;
   bool animating_transform = false;
 
   // Contents exactly fit on one tile at scale 1, no low res.
   float contents_scale = 1.f;
   SetContentsScaleOnBothLayers(contents_scale, device_scale, page_scale,
                                maximum_animation_scale,
@@ skipping 14 matching lines @@
   // TODO(danakj): Remove these when raster scale doesn't get fixed?
   ResetTilingsAndRasterScales();
 
   // Any content bounds that would create more than one tile will
   // generate a low res tiling.
   contents_scale = 2.5f;
   SetContentsScaleOnBothLayers(contents_scale, device_scale, page_scale,
                                maximum_animation_scale,
                                starting_animation_scale, animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), contents_scale);
-  EXPECT_EQ(active_layer_->LowResTiling()->contents_scale(),
+  EXPECT_EQ(active_layer()->LowResTiling()->contents_scale(),
             contents_scale * low_res_factor);
-  EXPECT_FALSE(pending_layer_->LowResTiling());
-  EXPECT_EQ(active_layer_->num_tilings(), 2u);
-  EXPECT_EQ(pending_layer_->num_tilings(), 1u);
+  EXPECT_FALSE(pending_layer()->LowResTiling());
+  EXPECT_EQ(active_layer()->num_tilings(), 2u);
+  EXPECT_EQ(pending_layer()->num_tilings(), 1u);
 
   // Mask layers dont create low res since they always fit on one tile.
   std::unique_ptr<FakePictureLayerImpl> mask =
       FakePictureLayerImpl::CreateMaskWithRasterSource(
-          host_impl_.pending_tree(), 3, pending_raster_source);
+          host_impl()->pending_tree(), 3, pending_raster_source);
   mask->SetBounds(layer_bounds);
   mask->SetDrawsContent(true);
-  pending_layer_->SetMaskLayer(std::move(mask));
-  pending_layer_->SetHasRenderSurface(true);
+  pending_layer()->SetMaskLayer(std::move(mask));
+  pending_layer()->SetHasRenderSurface(true);
   RebuildPropertyTreesOnPendingTree();
-  host_impl_.pending_tree()->UpdateDrawProperties(false);
+  host_impl()->pending_tree()->UpdateDrawProperties(false);
 
   FakePictureLayerImpl* mask_raw =
-      static_cast<FakePictureLayerImpl*>(pending_layer_->mask_layer());
+      static_cast<FakePictureLayerImpl*>(pending_layer()->mask_layer());
   // We did an UpdateDrawProperties above, which will set a contents scale on
   // the mask layer, so allow us to reset the contents scale.
   mask_raw->ReleaseResources();
   mask_raw->RecreateResources();
 
   SetupDrawPropertiesAndUpdateTiles(
       mask_raw, contents_scale, device_scale, page_scale,
       maximum_animation_scale, starting_animation_scale, animating_transform);
   EXPECT_EQ(mask_raw->HighResTiling()->contents_scale(), contents_scale);
   EXPECT_EQ(mask_raw->num_tilings(), 1u);
 }
 
 TEST_F(PictureLayerImplTest, HugeMasksGetScaledDown) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size layer_bounds(1000, 1000);
 
   scoped_refptr<FakeRasterSource> valid_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupPendingTree(valid_raster_source);
 
   std::unique_ptr<FakePictureLayerImpl> mask_ptr =
       FakePictureLayerImpl::CreateMaskWithRasterSource(
-          host_impl_.pending_tree(), 3, valid_raster_source);
+          host_impl()->pending_tree(), 3, valid_raster_source);
   mask_ptr->SetBounds(layer_bounds);
   mask_ptr->SetDrawsContent(true);
-  pending_layer_->SetMaskLayer(std::move(mask_ptr));
-  pending_layer_->test_properties()->force_render_surface = true;
+  pending_layer()->SetMaskLayer(std::move(mask_ptr));
+  pending_layer()->test_properties()->force_render_surface = true;
 
   RebuildPropertyTreesOnPendingTree();
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
   bool update_lcd_text = false;
-  host_impl_.pending_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->pending_tree()->UpdateDrawProperties(update_lcd_text);
 
   FakePictureLayerImpl* pending_mask =
-      static_cast<FakePictureLayerImpl*>(pending_layer_->mask_layer());
+      static_cast<FakePictureLayerImpl*>(pending_layer()->mask_layer());
 
   EXPECT_EQ(1.f, pending_mask->HighResTiling()->contents_scale());
   EXPECT_EQ(1u, pending_mask->num_tilings());
 
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(
       pending_mask->HighResTiling()->AllTilesForTesting());
 
   ActivateTree();
 
   FakePictureLayerImpl* active_mask =
-      static_cast<FakePictureLayerImpl*>(active_layer_->mask_layer());
+      static_cast<FakePictureLayerImpl*>(active_layer()->mask_layer());
 
   // Mask layers have a tiling with a single tile in it.
   EXPECT_EQ(1u, active_mask->HighResTiling()->AllTilesForTesting().size());
   // The mask resource exists.
   ResourceId mask_resource_id;
   gfx::Size mask_texture_size;
   active_mask->GetContentsResourceId(&mask_resource_id, &mask_texture_size);
   EXPECT_NE(0u, mask_resource_id);
   EXPECT_EQ(active_mask->bounds(), mask_texture_size);
 
   // Drop resources and recreate them, still the same.
   pending_mask->ReleaseResources();
   active_mask->ReleaseResources();
   pending_mask->RecreateResources();
   active_mask->RecreateResources();
   SetupDrawPropertiesAndUpdateTiles(active_mask, 1.f, 1.f, 1.f, 1.f, 0.f,
                                     false);
   active_mask->HighResTiling()->CreateAllTilesForTesting();
   EXPECT_EQ(1u, active_mask->HighResTiling()->AllTilesForTesting().size());
   EXPECT_NE(0u, mask_resource_id);
   EXPECT_EQ(active_mask->bounds(), mask_texture_size);
 
   // Resize larger than the max texture size.
-  int max_texture_size = host_impl_.GetRendererCapabilities().max_texture_size;
+  int max_texture_size =
+      host_impl()->GetRendererCapabilities().max_texture_size;
   gfx::Size huge_bounds(max_texture_size + 1, 10);
   scoped_refptr<FakeRasterSource> huge_raster_source =
       FakeRasterSource::CreateFilled(huge_bounds);
 
   SetupPendingTree(huge_raster_source);
   pending_mask->SetBounds(huge_bounds);
   pending_mask->SetRasterSourceOnPending(huge_raster_source, Region());
 
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
-  host_impl_.pending_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->pending_tree()->UpdateDrawProperties(update_lcd_text);
 
   // The mask tiling gets scaled down.
   EXPECT_LT(pending_mask->HighResTiling()->contents_scale(), 1.f);
   EXPECT_EQ(1u, pending_mask->num_tilings());
 
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(
       pending_mask->HighResTiling()->AllTilesForTesting());
 
   ActivateTree();
 
   // Mask layers have a tiling with a single tile in it.
   EXPECT_EQ(1u, active_mask->HighResTiling()->AllTilesForTesting().size());
   // The mask resource exists.
   active_mask->GetContentsResourceId(&mask_resource_id, &mask_texture_size);
   EXPECT_NE(0u, mask_resource_id);
   gfx::Size expected_size = active_mask->bounds();
   expected_size.SetToMin(gfx::Size(max_texture_size, max_texture_size));
   EXPECT_EQ(expected_size, mask_texture_size);
 
   // Drop resources and recreate them, still the same.
   pending_mask->ReleaseResources();
   active_mask->ReleaseResources();
   pending_mask->RecreateResources();
   active_mask->RecreateResources();
   SetupDrawPropertiesAndUpdateTiles(active_mask, 1.f, 1.f, 1.f, 1.f, 0.f,
                                     false);
   active_mask->HighResTiling()->CreateAllTilesForTesting();
   EXPECT_EQ(1u, active_mask->HighResTiling()->AllTilesForTesting().size());
   EXPECT_NE(0u, mask_resource_id);
   EXPECT_EQ(expected_size, mask_texture_size);
 
   // Do another activate, the same holds.
   SetupPendingTree(huge_raster_source);
   ActivateTree();
   EXPECT_EQ(1u, active_mask->HighResTiling()->AllTilesForTesting().size());
-  active_layer_->GetContentsResourceId(&mask_resource_id, &mask_texture_size);
+  active_layer()->GetContentsResourceId(&mask_resource_id, &mask_texture_size);
   EXPECT_EQ(expected_size, mask_texture_size);
   EXPECT_EQ(0u, mask_resource_id);
 
   // Resize even larger, so that the scale would be smaller than the minimum
   // contents scale. Then the layer should no longer have any tiling.
-  float min_contents_scale = host_impl_.settings().minimum_contents_scale;
+  float min_contents_scale = host_impl()->settings().minimum_contents_scale;
   gfx::Size extra_huge_bounds(max_texture_size / min_contents_scale + 1, 10);
   scoped_refptr<FakeRasterSource> extra_huge_raster_source =
       FakeRasterSource::CreateFilled(extra_huge_bounds);
 
   SetupPendingTree(extra_huge_raster_source);
   pending_mask->SetBounds(extra_huge_bounds);
   pending_mask->SetRasterSourceOnPending(extra_huge_raster_source, Region());
 
   EXPECT_FALSE(pending_mask->CanHaveTilings());
 
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
-  host_impl_.pending_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->pending_tree()->UpdateDrawProperties(update_lcd_text);
 
   EXPECT_EQ(0u, pending_mask->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, ScaledMaskLayer) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size layer_bounds(1000, 1000);
 
   SetInitialDeviceScaleFactor(1.3f);
 
   scoped_refptr<FakeRasterSource> valid_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupPendingTree(valid_raster_source);
 
   std::unique_ptr<FakePictureLayerImpl> mask_ptr =
       FakePictureLayerImpl::CreateMaskWithRasterSource(
-          host_impl_.pending_tree(), 3, valid_raster_source);
+          host_impl()->pending_tree(), 3, valid_raster_source);
   mask_ptr->SetBounds(layer_bounds);
   mask_ptr->SetDrawsContent(true);
-  pending_layer_->SetMaskLayer(std::move(mask_ptr));
-  pending_layer_->test_properties()->force_render_surface = true;
+  pending_layer()->SetMaskLayer(std::move(mask_ptr));
+  pending_layer()->test_properties()->force_render_surface = true;
 
   RebuildPropertyTreesOnPendingTree();
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
   bool update_lcd_text = false;
-  host_impl_.pending_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->pending_tree()->UpdateDrawProperties(update_lcd_text);
 
   FakePictureLayerImpl* pending_mask =
-      static_cast<FakePictureLayerImpl*>(pending_layer_->mask_layer());
+      static_cast<FakePictureLayerImpl*>(pending_layer()->mask_layer());
 
   // Masks are scaled, and do not have a low res tiling.
   EXPECT_EQ(1.3f, pending_mask->HighResTiling()->contents_scale());
   EXPECT_EQ(1u, pending_mask->num_tilings());
 
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(
       pending_mask->HighResTiling()->AllTilesForTesting());
 
   ActivateTree();
 
   FakePictureLayerImpl* active_mask =
-      static_cast<FakePictureLayerImpl*>(active_layer_->mask_layer());
+      static_cast<FakePictureLayerImpl*>(active_layer()->mask_layer());
 
   // Mask layers have a tiling with a single tile in it.
   EXPECT_EQ(1u, active_mask->HighResTiling()->AllTilesForTesting().size());
   // The mask resource exists.
   ResourceId mask_resource_id;
   gfx::Size mask_texture_size;
   active_mask->GetContentsResourceId(&mask_resource_id, &mask_texture_size);
   EXPECT_NE(0u, mask_resource_id);
   gfx::Size expected_mask_texture_size =
       gfx::ScaleToCeiledSize(active_mask->bounds(), 1.3f);
   EXPECT_EQ(mask_texture_size, expected_mask_texture_size);
 }
 
 TEST_F(PictureLayerImplTest, ReleaseResources) {
   gfx::Size layer_bounds(1300, 1900);
   SetupDefaultTrees(layer_bounds);
-  EXPECT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  EXPECT_EQ(1u, pending_layer()->tilings()->num_tilings());
 
   // All tilings should be removed when losing output surface.
-  active_layer_->ReleaseResources();
-  EXPECT_FALSE(active_layer_->tilings());
-  active_layer_->RecreateResources();
-  EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
-  pending_layer_->ReleaseResources();
-  EXPECT_FALSE(pending_layer_->tilings());
-  pending_layer_->RecreateResources();
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
+  active_layer()->ReleaseResources();
+  EXPECT_FALSE(active_layer()->tilings());
+  active_layer()->RecreateResources();
+  EXPECT_EQ(0u, active_layer()->tilings()->num_tilings());
+  pending_layer()->ReleaseResources();
+  EXPECT_FALSE(pending_layer()->tilings());
+  pending_layer()->RecreateResources();
+  EXPECT_EQ(0u, pending_layer()->tilings()->num_tilings());
 
   // This should create new tilings.
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(),
                                     1.f,  // ideal contents scale
                                     1.f,  // device scale
                                     1.f,  // page scale
                                     1.f,  // maximum animation scale
                                     0.f,  // starting animation_scale
                                     false);
-  EXPECT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  EXPECT_EQ(1u, pending_layer()->tilings()->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, ClampTilesToMaxTileSize) {
   gfx::Size layer_bounds(5000, 5000);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   SetupPendingTree(pending_raster_source);
-  EXPECT_GE(pending_layer_->tilings()->num_tilings(), 1u);
+  EXPECT_GE(pending_layer()->tilings()->num_tilings(), 1u);
 
-  pending_layer_->tilings()->tiling_at(0)->CreateAllTilesForTesting();
+  pending_layer()->tilings()->tiling_at(0)->CreateAllTilesForTesting();
 
   // The default value.
   EXPECT_EQ(gfx::Size(256, 256).ToString(),
-            host_impl_.settings().default_tile_size.ToString());
+            host_impl()->settings().default_tile_size.ToString());
 
-  Tile* tile = pending_layer_->tilings()->tiling_at(0)->AllTilesForTesting()[0];
+  Tile* tile =
+      pending_layer()->tilings()->tiling_at(0)->AllTilesForTesting()[0];
   EXPECT_EQ(gfx::Size(256, 256).ToString(),
             tile->content_rect().size().ToString());
 
   ResetTilingsAndRasterScales();
 
   // Change the max texture size on the output surface context.
   std::unique_ptr<TestWebGraphicsContext3D> context =
       TestWebGraphicsContext3D::Create();
   context->set_max_texture_size(140);
-  host_impl_.DidLoseOutputSurface();
-  std::unique_ptr<OutputSurface> new_output_surface =
-      FakeOutputSurface::Create3d(std::move(context));
-  host_impl_.SetVisible(true);
-  host_impl_.InitializeRenderer(new_output_surface.get());
-  output_surface_ = std::move(new_output_surface);
+  ResetOutputSurface(FakeOutputSurface::Create3d(std::move(context)));
 
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.f, 1.f, 1.f, 1.f, 0.f,
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(), 1.f, 1.f, 1.f, 1.f, 0.f,
                                     false);
-  ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, pending_layer()->tilings()->num_tilings());
 
-  pending_layer_->tilings()->tiling_at(0)->CreateAllTilesForTesting();
+  pending_layer()->tilings()->tiling_at(0)->CreateAllTilesForTesting();
 
   // Verify the tiles are not larger than the context's max texture size.
-  tile = pending_layer_->tilings()->tiling_at(0)->AllTilesForTesting()[0];
+  tile = pending_layer()->tilings()->tiling_at(0)->AllTilesForTesting()[0];
   EXPECT_GE(140, tile->content_rect().width());
   EXPECT_GE(140, tile->content_rect().height());
 }
 
 TEST_F(PictureLayerImplTest, ClampSingleTileToToMaxTileSize) {
   gfx::Size layer_bounds(500, 500);
   SetupDefaultTrees(layer_bounds);
-  EXPECT_GE(active_layer_->tilings()->num_tilings(), 1u);
+  EXPECT_GE(active_layer()->tilings()->num_tilings(), 1u);
 
-  active_layer_->tilings()->tiling_at(0)->CreateAllTilesForTesting();
+  active_layer()->tilings()->tiling_at(0)->CreateAllTilesForTesting();
 
   // The default value. The layer is smaller than this.
   EXPECT_EQ(gfx::Size(512, 512).ToString(),
-            host_impl_.settings().max_untiled_layer_size.ToString());
+            host_impl()->settings().max_untiled_layer_size.ToString());
 
   // There should be a single tile since the layer is small.
-  PictureLayerTiling* high_res_tiling = active_layer_->tilings()->tiling_at(0);
+  PictureLayerTiling* high_res_tiling = active_layer()->tilings()->tiling_at(0);
   EXPECT_EQ(1u, high_res_tiling->AllTilesForTesting().size());
 
   ResetTilingsAndRasterScales();
 
   // Change the max texture size on the output surface context.
   std::unique_ptr<TestWebGraphicsContext3D> context =
       TestWebGraphicsContext3D::Create();
   context->set_max_texture_size(140);
-  host_impl_.DidLoseOutputSurface();
-  std::unique_ptr<OutputSurface> new_output_surface =
-      FakeOutputSurface::Create3d(std::move(context));
-  host_impl_.SetVisible(true);
-  host_impl_.InitializeRenderer(new_output_surface.get());
-  output_surface_ = std::move(new_output_surface);
+  ResetOutputSurface(FakeOutputSurface::Create3d(std::move(context)));
 
-  SetupDrawPropertiesAndUpdateTiles(active_layer_, 1.f, 1.f, 1.f, 1.f, 0.f,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(), 1.f, 1.f, 1.f, 1.f, 0.f,
                                     false);
-  ASSERT_LE(1u, active_layer_->tilings()->num_tilings());
+  ASSERT_LE(1u, active_layer()->tilings()->num_tilings());
 
-  active_layer_->tilings()->tiling_at(0)->CreateAllTilesForTesting();
+  active_layer()->tilings()->tiling_at(0)->CreateAllTilesForTesting();
 
   // There should be more than one tile since the max texture size won't cover
   // the layer.
-  high_res_tiling = active_layer_->tilings()->tiling_at(0);
+  high_res_tiling = active_layer()->tilings()->tiling_at(0);
   EXPECT_LT(1u, high_res_tiling->AllTilesForTesting().size());
 
   // Verify the tiles are not larger than the context's max texture size.
-  Tile* tile = active_layer_->tilings()->tiling_at(0)->AllTilesForTesting()[0];
+  Tile* tile = active_layer()->tilings()->tiling_at(0)->AllTilesForTesting()[0];
   EXPECT_GE(140, tile->content_rect().width());
   EXPECT_GE(140, tile->content_rect().height());
 }
 
 TEST_F(PictureLayerImplTest, DisallowTileDrawQuads) {
   std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
 
   gfx::Size layer_bounds(1300, 1900);
   gfx::Rect layer_rect(layer_bounds);
 
   gfx::Rect layer_invalidation(150, 200, 30, 180);
   SetupDefaultTreesWithInvalidation(layer_bounds, layer_invalidation);
 
-  active_layer_->SetContentsOpaque(true);
-  active_layer_->draw_properties().visible_layer_rect = gfx::Rect(layer_bounds);
+  active_layer()->SetContentsOpaque(true);
+  active_layer()->draw_properties().visible_layer_rect =
+      gfx::Rect(layer_bounds);
 
   AppendQuadsData data;
-  active_layer_->WillDraw(DRAW_MODE_RESOURCELESS_SOFTWARE, nullptr);
-  active_layer_->AppendQuads(render_pass.get(), &data);
-  active_layer_->DidDraw(nullptr);
+  active_layer()->WillDraw(DRAW_MODE_RESOURCELESS_SOFTWARE, nullptr);
+  active_layer()->AppendQuads(render_pass.get(), &data);
+  active_layer()->DidDraw(nullptr);
 
   ASSERT_EQ(1u, render_pass->quad_list.size());
   EXPECT_EQ(DrawQuad::PICTURE_CONTENT,
             render_pass->quad_list.front()->material);
   EXPECT_EQ(render_pass->quad_list.front()->rect, layer_rect);
   EXPECT_EQ(render_pass->quad_list.front()->opaque_rect, layer_rect);
   EXPECT_EQ(render_pass->quad_list.front()->visible_rect, layer_rect);
 }
 
 TEST_F(PictureLayerImplTest, ResourcelessPartialRecording) {
   std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
 
   gfx::Size tile_size(400, 400);
   gfx::Size layer_bounds(700, 650);
   gfx::Rect layer_rect(layer_bounds);
   SetInitialDeviceScaleFactor(2.f);
 
   gfx::Rect recorded_viewport(20, 30, 40, 50);
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreatePartiallyFilled(layer_bounds, recorded_viewport);
 
   SetupPendingTree(active_raster_source);
   ActivateTree();
 
-  active_layer_->SetContentsOpaque(true);
+  active_layer()->SetContentsOpaque(true);
   gfx::Rect visible_rect(30, 35, 10, 5);
-  active_layer_->draw_properties().visible_layer_rect = visible_rect;
+  active_layer()->draw_properties().visible_layer_rect = visible_rect;
 
   AppendQuadsData data;
-  active_layer_->WillDraw(DRAW_MODE_RESOURCELESS_SOFTWARE, nullptr);
-  active_layer_->AppendQuads(render_pass.get(), &data);
-  active_layer_->DidDraw(nullptr);
+  active_layer()->WillDraw(DRAW_MODE_RESOURCELESS_SOFTWARE, nullptr);
+  active_layer()->AppendQuads(render_pass.get(), &data);
+  active_layer()->DidDraw(nullptr);
 
   gfx::Rect scaled_visible = gfx::ScaleToEnclosingRect(visible_rect, 2.f);
   gfx::Rect scaled_recorded = gfx::ScaleToEnclosingRect(recorded_viewport, 2.f);
   gfx::Rect quad_visible = gfx::IntersectRects(scaled_visible, scaled_recorded);
 
   ASSERT_EQ(1U, render_pass->quad_list.size());
   EXPECT_EQ(DrawQuad::PICTURE_CONTENT,
             render_pass->quad_list.front()->material);
   const DrawQuad* quad = render_pass->quad_list.front();
   EXPECT_EQ(quad_visible, quad->rect);
   EXPECT_EQ(quad_visible, quad->opaque_rect);
   EXPECT_EQ(quad_visible, quad->visible_rect);
 }
 
 TEST_F(PictureLayerImplTest, ResourcelessEmptyRecording) {
   std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
 
   gfx::Size layer_bounds(700, 650);
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreatePartiallyFilled(layer_bounds, gfx::Rect());
   SetupPendingTree(active_raster_source);
   ActivateTree();
 
-  active_layer_->SetContentsOpaque(true);
-  active_layer_->draw_properties().visible_layer_rect = gfx::Rect(layer_bounds);
+  active_layer()->SetContentsOpaque(true);
+  active_layer()->draw_properties().visible_layer_rect =
+      gfx::Rect(layer_bounds);
 
   AppendQuadsData data;
-  active_layer_->WillDraw(DRAW_MODE_RESOURCELESS_SOFTWARE, nullptr);
-  active_layer_->AppendQuads(render_pass.get(), &data);
-  active_layer_->DidDraw(nullptr);
+  active_layer()->WillDraw(DRAW_MODE_RESOURCELESS_SOFTWARE, nullptr);
+  active_layer()->AppendQuads(render_pass.get(), &data);
+  active_layer()->DidDraw(nullptr);
 
   EXPECT_EQ(0U, render_pass->quad_list.size());
 }
 
 TEST_F(PictureLayerImplTest, SolidColorLayerHasVisibleFullCoverage) {
   std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
 
   gfx::Size layer_bounds(1500, 1500);
   gfx::Rect visible_rect(250, 250, 1000, 1000);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilledSolidColor(layer_bounds);
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreateFilledSolidColor(layer_bounds);
 
   SetupTrees(pending_raster_source, active_raster_source);
 
-  active_layer_->draw_properties().visible_layer_rect = visible_rect;
+  active_layer()->draw_properties().visible_layer_rect = visible_rect;
 
   AppendQuadsData data;
-  active_layer_->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
-  active_layer_->AppendQuads(render_pass.get(), &data);
-  active_layer_->DidDraw(nullptr);
+  active_layer()->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
+  active_layer()->AppendQuads(render_pass.get(), &data);
+  active_layer()->DidDraw(nullptr);
 
   Region remaining = visible_rect;
   for (const auto& quad : render_pass->quad_list) {
     EXPECT_TRUE(visible_rect.Contains(quad->rect));
     EXPECT_TRUE(remaining.Contains(quad->rect));
     remaining.Subtract(quad->rect);
   }
 
   EXPECT_TRUE(remaining.IsEmpty());
 }
 
 TEST_F(PictureLayerImplTest, TileScalesWithSolidColorRasterSource) {
   gfx::Size layer_bounds(200, 200);
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreateFilledSolidColor(layer_bounds);
 
   SetupTrees(pending_raster_source, active_raster_source);
   // Solid color raster source should not allow tilings at any scale.
-  EXPECT_FALSE(active_layer_->CanHaveTilings());
-  EXPECT_EQ(0.f, active_layer_->ideal_contents_scale());
+  EXPECT_FALSE(active_layer()->CanHaveTilings());
+  EXPECT_EQ(0.f, active_layer()->ideal_contents_scale());
 
   // Activate non-solid-color pending raster source makes active layer can have
   // tilings.
   ActivateTree();
-  EXPECT_TRUE(active_layer_->CanHaveTilings());
-  EXPECT_GT(active_layer_->ideal_contents_scale(), 0.f);
+  EXPECT_TRUE(active_layer()->CanHaveTilings());
+  EXPECT_GT(active_layer()->ideal_contents_scale(), 0.f);
 }
 
 TEST_F(NoLowResPictureLayerImplTest, MarkRequiredOffscreenTiles) {
   gfx::Size layer_bounds(200, 200);
 
   gfx::Transform transform;
   gfx::Rect viewport(0, 0, 100, 200);
-  host_impl_.SetExternalTilePriorityConstraints(viewport, transform);
+  host_impl()->SetExternalTilePriorityConstraints(viewport, transform);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupPendingTreeWithFixedTileSize(pending_raster_source, gfx::Size(100, 100),
                                     Region());
 
-  EXPECT_EQ(1u, pending_layer_->num_tilings());
-  EXPECT_EQ(viewport,
-            pending_layer_->viewport_rect_for_tile_priority_in_content_space());
+  EXPECT_EQ(1u, pending_layer()->num_tilings());
+  EXPECT_EQ(
+      viewport,
+      pending_layer()->viewport_rect_for_tile_priority_in_content_space());
 
   base::TimeTicks time_ticks;
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
-  pending_layer_->UpdateTiles();
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  pending_layer()->UpdateTiles();
 
   int num_visible = 0;
   int num_offscreen = 0;
 
   std::unique_ptr<TilingSetRasterQueueAll> queue(new TilingSetRasterQueueAll(
-      pending_layer_->picture_layer_tiling_set(), false));
+      pending_layer()->picture_layer_tiling_set(), false));
   for (; !queue->IsEmpty(); queue->Pop()) {
     const PrioritizedTile& prioritized_tile = queue->Top();
     DCHECK(prioritized_tile.tile());
     if (prioritized_tile.priority().distance_to_visible == 0.f) {
       EXPECT_TRUE(prioritized_tile.tile()->required_for_activation());
       num_visible++;
     } else {
       EXPECT_FALSE(prioritized_tile.tile()->required_for_activation());
       num_offscreen++;
     }
   }
 
   EXPECT_GT(num_visible, 0);
   EXPECT_GT(num_offscreen, 0);
 }
 
 TEST_F(NoLowResPictureLayerImplTest,
        TileOutsideOfViewportForTilePriorityNotRequired) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(400, 400);
   gfx::Rect external_viewport_for_tile_priority(400, 200);
   gfx::Rect visible_layer_rect(200, 400);
 
   SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, Region());
 
-  ASSERT_EQ(1u, pending_layer_->num_tilings());
-  ASSERT_EQ(1.f, pending_layer_->HighResTiling()->contents_scale());
+  ASSERT_EQ(1u, pending_layer()->num_tilings());
+  ASSERT_EQ(1.f, pending_layer()->HighResTiling()->contents_scale());
 
   // Set external viewport for tile priority.
   gfx::Rect viewport = gfx::Rect(layer_bounds);
   gfx::Transform transform;
   gfx::Transform transform_for_tile_priority;
-  host_impl_.SetExternalTilePriorityConstraints(
+  host_impl()->SetExternalTilePriorityConstraints(
       external_viewport_for_tile_priority, transform_for_tile_priority);
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
   bool update_lcd_text = false;
-  host_impl_.pending_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->pending_tree()->UpdateDrawProperties(update_lcd_text);
 
   // Set visible content rect that is different from
   // external_viewport_for_tile_priority.
-  pending_layer_->draw_properties().visible_layer_rect = visible_layer_rect;
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
-  pending_layer_->UpdateTiles();
+  pending_layer()->draw_properties().visible_layer_rect = visible_layer_rect;
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
+  pending_layer()->UpdateTiles();
 
   // Intersect the two rects. Any tile outside should not be required for
   // activation.
   gfx::Rect viewport_for_tile_priority =
-      pending_layer_->viewport_rect_for_tile_priority_in_content_space();
-  viewport_for_tile_priority.Intersect(pending_layer_->visible_layer_rect());
+      pending_layer()->viewport_rect_for_tile_priority_in_content_space();
+  viewport_for_tile_priority.Intersect(pending_layer()->visible_layer_rect());
 
-  EXPECT_TRUE(pending_layer_->HighResTiling()->AllTilesForTesting().empty());
+  EXPECT_TRUE(pending_layer()->HighResTiling()->AllTilesForTesting().empty());
 
   int num_inside = 0;
   int num_outside = 0;
-  for (PictureLayerTiling::CoverageIterator iter(active_layer_->HighResTiling(),
-                                                 1.f, gfx::Rect(layer_bounds));
+  for (PictureLayerTiling::CoverageIterator iter(
+           active_layer()->HighResTiling(), 1.f, gfx::Rect(layer_bounds));
        iter; ++iter) {
     if (!*iter)
       continue;
     Tile* tile = *iter;
     if (viewport_for_tile_priority.Intersects(iter.geometry_rect())) {
       num_inside++;
       // Mark everything in viewport for tile priority as ready to draw.
       TileDrawInfo& draw_info = tile->draw_info();
       draw_info.SetSolidColorForTesting(SK_ColorRED);
     } else {
       num_outside++;
       EXPECT_FALSE(tile->required_for_activation());
     }
   }
 
   EXPECT_GT(num_inside, 0);
   EXPECT_GT(num_outside, 0);
 
   // Activate and draw active layer.
-  host_impl_.ActivateSyncTree();
-  host_impl_.active_tree()->UpdateDrawProperties(update_lcd_text);
-  active_layer_->draw_properties().visible_layer_rect = visible_layer_rect;
+  host_impl()->ActivateSyncTree();
+  host_impl()->active_tree()->UpdateDrawProperties(update_lcd_text);
+  active_layer()->draw_properties().visible_layer_rect = visible_layer_rect;
 
   std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
-  active_layer_->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
-  active_layer_->AppendQuads(render_pass.get(), &data);
-  active_layer_->DidDraw(nullptr);
+  active_layer()->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
+  active_layer()->AppendQuads(render_pass.get(), &data);
+  active_layer()->DidDraw(nullptr);
 
   // All tiles in activation rect is ready to draw.
   EXPECT_EQ(0u, data.num_missing_tiles);
   EXPECT_EQ(0u, data.num_incomplete_tiles);
-  EXPECT_FALSE(active_layer_->only_used_low_res_last_append_quads());
+  EXPECT_FALSE(active_layer()->only_used_low_res_last_append_quads());
 }
 
 TEST_F(PictureLayerImplTest, HighResTileIsComplete) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(200, 200);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size, Region());
   ActivateTree();
 
   // All high res tiles have resources.
   std::vector<Tile*> tiles =
-      active_layer_->tilings()->tiling_at(0)->AllTilesForTesting();
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(tiles);
+      active_layer()->tilings()->tiling_at(0)->AllTilesForTesting();
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(tiles);
 
   std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
-  active_layer_->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
-  active_layer_->AppendQuads(render_pass.get(), &data);
-  active_layer_->DidDraw(nullptr);
+  active_layer()->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
+  active_layer()->AppendQuads(render_pass.get(), &data);
+  active_layer()->DidDraw(nullptr);
 
   // All high res tiles drew, nothing was incomplete.
   EXPECT_EQ(9u, render_pass->quad_list.size());
   EXPECT_EQ(0u, data.num_missing_tiles);
   EXPECT_EQ(0u, data.num_incomplete_tiles);
-  EXPECT_FALSE(active_layer_->only_used_low_res_last_append_quads());
+  EXPECT_FALSE(active_layer()->only_used_low_res_last_append_quads());
 }
 
 TEST_F(PictureLayerImplTest, HighResTileIsIncomplete) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(200, 200);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size, Region());
   ActivateTree();
 
   std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
-  active_layer_->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
-  active_layer_->AppendQuads(render_pass.get(), &data);
-  active_layer_->DidDraw(nullptr);
+  active_layer()->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
+  active_layer()->AppendQuads(render_pass.get(), &data);
+  active_layer()->DidDraw(nullptr);
 
   EXPECT_EQ(1u, render_pass->quad_list.size());
   EXPECT_EQ(1u, data.num_missing_tiles);
   EXPECT_EQ(0u, data.num_incomplete_tiles);
-  EXPECT_TRUE(active_layer_->only_used_low_res_last_append_quads());
+  EXPECT_TRUE(active_layer()->only_used_low_res_last_append_quads());
 }
 
 TEST_F(PictureLayerImplTest, HighResTileIsIncompleteLowResComplete) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(200, 200);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size, Region());
   ActivateTree();
 
   std::vector<Tile*> low_tiles =
-      active_layer_->tilings()->tiling_at(1)->AllTilesForTesting();
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(low_tiles);
+      active_layer()->tilings()->tiling_at(1)->AllTilesForTesting();
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(
+      low_tiles);
 
   std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
-  active_layer_->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
-  active_layer_->AppendQuads(render_pass.get(), &data);
-  active_layer_->DidDraw(nullptr);
+  active_layer()->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
+  active_layer()->AppendQuads(render_pass.get(), &data);
+  active_layer()->DidDraw(nullptr);
 
   EXPECT_EQ(1u, render_pass->quad_list.size());
   EXPECT_EQ(0u, data.num_missing_tiles);
   EXPECT_EQ(1u, data.num_incomplete_tiles);
-  EXPECT_TRUE(active_layer_->only_used_low_res_last_append_quads());
+  EXPECT_TRUE(active_layer()->only_used_low_res_last_append_quads());
 }
 
 TEST_F(PictureLayerImplTest, LowResTileIsIncomplete) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(200, 200);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size, Region());
   ActivateTree();
 
   // All high res tiles have resources except one.
   std::vector<Tile*> high_tiles =
-      active_layer_->tilings()->tiling_at(0)->AllTilesForTesting();
+      active_layer()->tilings()->tiling_at(0)->AllTilesForTesting();
   high_tiles.erase(high_tiles.begin());
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(high_tiles);
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(
+      high_tiles);
 
   // All low res tiles have resources.
   std::vector<Tile*> low_tiles =
-      active_layer_->tilings()->tiling_at(1)->AllTilesForTesting();
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(low_tiles);
+      active_layer()->tilings()->tiling_at(1)->AllTilesForTesting();
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(
+      low_tiles);
 
   std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
-  active_layer_->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
-  active_layer_->AppendQuads(render_pass.get(), &data);
-  active_layer_->DidDraw(nullptr);
+  active_layer()->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
+  active_layer()->AppendQuads(render_pass.get(), &data);
+  active_layer()->DidDraw(nullptr);
 
   // The missing high res tile was replaced by a low res tile.
   EXPECT_EQ(9u, render_pass->quad_list.size());
   EXPECT_EQ(0u, data.num_missing_tiles);
   EXPECT_EQ(1u, data.num_incomplete_tiles);
-  EXPECT_FALSE(active_layer_->only_used_low_res_last_append_quads());
+  EXPECT_FALSE(active_layer()->only_used_low_res_last_append_quads());
 }
 
 TEST_F(PictureLayerImplTest,
        HighResAndIdealResTileIsCompleteWhenRasterScaleIsNotIdeal) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(200, 200);
   gfx::Size viewport_size(400, 400);
 
-  host_impl_.SetViewportSize(viewport_size);
+  host_impl()->SetViewportSize(viewport_size);
   SetInitialDeviceScaleFactor(2.f);
 
   SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, Region());
 
   // One ideal tile exists, this will get used when drawing.
   std::vector<Tile*> ideal_tiles;
-  EXPECT_EQ(2.f, active_layer_->HighResTiling()->contents_scale());
-  ideal_tiles.push_back(active_layer_->HighResTiling()->TileAt(0, 0));
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(
+  EXPECT_EQ(2.f, active_layer()->HighResTiling()->contents_scale());
+  ideal_tiles.push_back(active_layer()->HighResTiling()->TileAt(0, 0));
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(
       ideal_tiles);
 
   // Due to layer scale throttling, the raster contents scale is changed to 1,
   // while the ideal is still 2.
-  SetupDrawPropertiesAndUpdateTiles(active_layer_, 1.f, 1.f, 1.f, 1.f, 0.f,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(), 1.f, 1.f, 1.f, 1.f, 0.f,
                                     false);
-  SetupDrawPropertiesAndUpdateTiles(active_layer_, 2.f, 1.f, 1.f, 1.f, 0.f,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(), 2.f, 1.f, 1.f, 1.f, 0.f,
                                     false);
 
-  EXPECT_EQ(1.f, active_layer_->HighResTiling()->contents_scale());
-  EXPECT_EQ(1.f, active_layer_->raster_contents_scale());
-  EXPECT_EQ(2.f, active_layer_->ideal_contents_scale());
+  EXPECT_EQ(1.f, active_layer()->HighResTiling()->contents_scale());
+  EXPECT_EQ(1.f, active_layer()->raster_contents_scale());
+  EXPECT_EQ(2.f, active_layer()->ideal_contents_scale());
 
   // Both tilings still exist.
-  EXPECT_EQ(2.f, active_layer_->tilings()->tiling_at(0)->contents_scale());
-  EXPECT_EQ(1.f, active_layer_->tilings()->tiling_at(1)->contents_scale());
+  EXPECT_EQ(2.f, active_layer()->tilings()->tiling_at(0)->contents_scale());
+  EXPECT_EQ(1.f, active_layer()->tilings()->tiling_at(1)->contents_scale());
 
   // All high res tiles have resources.
   std::vector<Tile*> high_tiles =
-      active_layer_->HighResTiling()->AllTilesForTesting();
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(high_tiles);
+      active_layer()->HighResTiling()->AllTilesForTesting();
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(
+      high_tiles);
 
   std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
-  active_layer_->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
-  active_layer_->AppendQuads(render_pass.get(), &data);
-  active_layer_->DidDraw(nullptr);
+  active_layer()->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
+  active_layer()->AppendQuads(render_pass.get(), &data);
+  active_layer()->DidDraw(nullptr);
 
   // All high res tiles drew, and the one ideal res tile drew.
   ASSERT_GT(render_pass->quad_list.size(), 9u);
   EXPECT_EQ(gfx::SizeF(99.f, 99.f),
             TileDrawQuad::MaterialCast(render_pass->quad_list.front())
                 ->tex_coord_rect.size());
   EXPECT_EQ(gfx::SizeF(49.5f, 49.5f),
             TileDrawQuad::MaterialCast(render_pass->quad_list.ElementAt(1))
                 ->tex_coord_rect.size());
 
   // Neither the high res nor the ideal tiles were considered as incomplete.
   EXPECT_EQ(0u, data.num_missing_tiles);
   EXPECT_EQ(0u, data.num_incomplete_tiles);
-  EXPECT_FALSE(active_layer_->only_used_low_res_last_append_quads());
+  EXPECT_FALSE(active_layer()->only_used_low_res_last_append_quads());
 }
 
 TEST_F(PictureLayerImplTest, AppendQuadsDataForCheckerboard) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(200, 200);
   gfx::Rect recorded_viewport(0, 0, 150, 150);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreatePartiallyFilled(layer_bounds, recorded_viewport);
   SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size, Region());
   ActivateTree();
 
   std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
-  active_layer_->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
-  active_layer_->AppendQuads(render_pass.get(), &data);
-  active_layer_->DidDraw(nullptr);
+  active_layer()->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
+  active_layer()->AppendQuads(render_pass.get(), &data);
+  active_layer()->DidDraw(nullptr);
 
   EXPECT_EQ(1u, render_pass->quad_list.size());
   EXPECT_EQ(1u, data.num_missing_tiles);
   EXPECT_EQ(0u, data.num_incomplete_tiles);
   EXPECT_EQ(40000, data.checkerboarded_visible_content_area);
   EXPECT_EQ(17500, data.checkerboarded_no_recording_content_area);
   EXPECT_EQ(22500, data.checkerboarded_needs_raster_content_area);
-  EXPECT_TRUE(active_layer_->only_used_low_res_last_append_quads());
+  EXPECT_TRUE(active_layer()->only_used_low_res_last_append_quads());
 }
 
 TEST_F(PictureLayerImplTest, HighResRequiredWhenActiveAllReady) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
 
   SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size,
                                      gfx::Rect(layer_bounds));
 
-  active_layer_->SetAllTilesReady();
+  active_layer()->SetAllTilesReady();
 
   // All active tiles ready, so pending can only activate with all high res
   // tiles.
-  pending_layer_->HighResTiling()->UpdateAllRequiredStateForTesting();
-  EXPECT_FALSE(pending_layer_->LowResTiling());
+  pending_layer()->HighResTiling()->UpdateAllRequiredStateForTesting();
+  EXPECT_FALSE(pending_layer()->LowResTiling());
 
-  AssertAllTilesRequired(pending_layer_->HighResTiling());
+  AssertAllTilesRequired(pending_layer()->HighResTiling());
 }
 
 TEST_F(PictureLayerImplTest, HighResRequiredWhenMissingHighResFlagOn) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
 
   // No invalidation.
   SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, Region());
 
   // Verify active tree not ready.
   Tile* some_active_tile =
-      active_layer_->HighResTiling()->AllTilesForTesting()[0];
+      active_layer()->HighResTiling()->AllTilesForTesting()[0];
   EXPECT_FALSE(some_active_tile->draw_info().IsReadyToDraw());
 
   // When high res are required, all tiles in active high res tiling should be
   // required for activation.
-  host_impl_.SetRequiresHighResToDraw();
+  host_impl()->SetRequiresHighResToDraw();
 
-  pending_layer_->HighResTiling()->UpdateAllRequiredStateForTesting();
-  EXPECT_FALSE(pending_layer_->LowResTiling());
-  active_layer_->HighResTiling()->UpdateAllRequiredStateForTesting();
-  active_layer_->LowResTiling()->UpdateAllRequiredStateForTesting();
+  pending_layer()->HighResTiling()->UpdateAllRequiredStateForTesting();
+  EXPECT_FALSE(pending_layer()->LowResTiling());
+  active_layer()->HighResTiling()->UpdateAllRequiredStateForTesting();
+  active_layer()->LowResTiling()->UpdateAllRequiredStateForTesting();
 
-  EXPECT_TRUE(pending_layer_->HighResTiling()->AllTilesForTesting().empty());
-  AssertAllTilesRequired(active_layer_->HighResTiling());
-  AssertNoTilesRequired(active_layer_->LowResTiling());
+  EXPECT_TRUE(pending_layer()->HighResTiling()->AllTilesForTesting().empty());
+  AssertAllTilesRequired(active_layer()->HighResTiling());
+  AssertNoTilesRequired(active_layer()->LowResTiling());
 }
 
 TEST_F(PictureLayerImplTest, AllHighResRequiredEvenIfNotChanged) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
 
   SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, Region());
 
   Tile* some_active_tile =
-      active_layer_->HighResTiling()->AllTilesForTesting()[0];
+      active_layer()->HighResTiling()->AllTilesForTesting()[0];
   EXPECT_FALSE(some_active_tile->draw_info().IsReadyToDraw());
 
   // Since there are no invalidations, pending tree should have no tiles.
-  EXPECT_TRUE(pending_layer_->HighResTiling()->AllTilesForTesting().empty());
-  EXPECT_FALSE(pending_layer_->LowResTiling());
+  EXPECT_TRUE(pending_layer()->HighResTiling()->AllTilesForTesting().empty());
+  EXPECT_FALSE(pending_layer()->LowResTiling());
 
-  active_layer_->HighResTiling()->UpdateAllRequiredStateForTesting();
-  active_layer_->LowResTiling()->UpdateAllRequiredStateForTesting();
+  active_layer()->HighResTiling()->UpdateAllRequiredStateForTesting();
+  active_layer()->LowResTiling()->UpdateAllRequiredStateForTesting();
 
-  AssertAllTilesRequired(active_layer_->HighResTiling());
-  AssertNoTilesRequired(active_layer_->LowResTiling());
+  AssertAllTilesRequired(active_layer()->HighResTiling());
+  AssertNoTilesRequired(active_layer()->LowResTiling());
 }
 
 TEST_F(PictureLayerImplTest, DisallowRequiredForActivation) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
 
   SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, Region());
 
   Tile* some_active_tile =
-      active_layer_->HighResTiling()->AllTilesForTesting()[0];
+      active_layer()->HighResTiling()->AllTilesForTesting()[0];
   EXPECT_FALSE(some_active_tile->draw_info().IsReadyToDraw());
 
-  EXPECT_TRUE(pending_layer_->HighResTiling()->AllTilesForTesting().empty());
-  EXPECT_FALSE(pending_layer_->LowResTiling());
-  active_layer_->HighResTiling()->set_can_require_tiles_for_activation(false);
-  active_layer_->LowResTiling()->set_can_require_tiles_for_activation(false);
-  pending_layer_->HighResTiling()->set_can_require_tiles_for_activation(false);
+  EXPECT_TRUE(pending_layer()->HighResTiling()->AllTilesForTesting().empty());
+  EXPECT_FALSE(pending_layer()->LowResTiling());
+  active_layer()->HighResTiling()->set_can_require_tiles_for_activation(false);
+  active_layer()->LowResTiling()->set_can_require_tiles_for_activation(false);
+  pending_layer()->HighResTiling()->set_can_require_tiles_for_activation(false);
 
   // If we disallow required for activation, no tiles can be required.
-  active_layer_->HighResTiling()->UpdateAllRequiredStateForTesting();
-  active_layer_->LowResTiling()->UpdateAllRequiredStateForTesting();
+  active_layer()->HighResTiling()->UpdateAllRequiredStateForTesting();
+  active_layer()->LowResTiling()->UpdateAllRequiredStateForTesting();
 
-  AssertNoTilesRequired(active_layer_->HighResTiling());
-  AssertNoTilesRequired(active_layer_->LowResTiling());
+  AssertNoTilesRequired(active_layer()->HighResTiling());
+  AssertNoTilesRequired(active_layer()->LowResTiling());
 }
 
 TEST_F(PictureLayerImplTest, NothingRequiredIfActiveMissingTiles) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   // This raster source will create tilings, but has no recordings so will not
   // create any tiles.  This is attempting to simulate scrolling past the end of
   // recorded content on the active layer, where the recordings are so far away
   // that no tiles are created.
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreatePartiallyFilled(layer_bounds, gfx::Rect());
 
   SetupTreesWithFixedTileSize(pending_raster_source, active_raster_source,
                               tile_size, Region());
 
   // Active layer has tilings, but no tiles due to missing recordings.
-  EXPECT_TRUE(active_layer_->CanHaveTilings());
-  EXPECT_EQ(active_layer_->tilings()->num_tilings(), 2u);
-  EXPECT_EQ(active_layer_->HighResTiling()->AllTilesForTesting().size(), 0u);
+  EXPECT_TRUE(active_layer()->CanHaveTilings());
+  EXPECT_EQ(active_layer()->tilings()->num_tilings(), 2u);
+  EXPECT_EQ(active_layer()->HighResTiling()->AllTilesForTesting().size(), 0u);
 
   // Since the active layer has no tiles at all, the pending layer doesn't
   // need content in order to activate.
-  pending_layer_->HighResTiling()->UpdateAllRequiredStateForTesting();
-  EXPECT_FALSE(pending_layer_->LowResTiling());
+  pending_layer()->HighResTiling()->UpdateAllRequiredStateForTesting();
+  EXPECT_FALSE(pending_layer()->LowResTiling());
 
-  AssertNoTilesRequired(pending_layer_->HighResTiling());
+  AssertNoTilesRequired(pending_layer()->HighResTiling());
 }
 
 TEST_F(PictureLayerImplTest, HighResRequiredIfActiveCantHaveTiles) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreateEmpty(layer_bounds);
   SetupTreesWithFixedTileSize(pending_raster_source, active_raster_source,
                               tile_size, Region());
 
   // Active layer can't have tiles.
-  EXPECT_FALSE(active_layer_->CanHaveTilings());
+  EXPECT_FALSE(active_layer()->CanHaveTilings());
 
   // All high res tiles required.  This should be considered identical
   // to the case where there is no active layer, to avoid flashing content.
   // This can happen if a layer exists for a while and switches from
   // not being able to have content to having content.
-  pending_layer_->HighResTiling()->UpdateAllRequiredStateForTesting();
-  EXPECT_FALSE(pending_layer_->LowResTiling());
+  pending_layer()->HighResTiling()->UpdateAllRequiredStateForTesting();
+  EXPECT_FALSE(pending_layer()->LowResTiling());
 
-  AssertAllTilesRequired(pending_layer_->HighResTiling());
+  AssertAllTilesRequired(pending_layer()->HighResTiling());
 }
 
 TEST_F(PictureLayerImplTest, HighResRequiredWhenActiveHasDifferentBounds) {
   gfx::Size pending_layer_bounds(400, 400);
   gfx::Size active_layer_bounds(200, 200);
   gfx::Size tile_size(100, 100);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(pending_layer_bounds);
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreateFilled(active_layer_bounds);
 
   SetupTreesWithFixedTileSize(pending_raster_source, active_raster_source,
                               tile_size, Region());
 
   // Since the active layer has different bounds, the pending layer needs all
   // high res tiles in order to activate.
-  pending_layer_->HighResTiling()->UpdateAllRequiredStateForTesting();
-  EXPECT_FALSE(pending_layer_->LowResTiling());
-  active_layer_->HighResTiling()->UpdateAllRequiredStateForTesting();
-  active_layer_->LowResTiling()->UpdateAllRequiredStateForTesting();
+  pending_layer()->HighResTiling()->UpdateAllRequiredStateForTesting();
+  EXPECT_FALSE(pending_layer()->LowResTiling());
+  active_layer()->HighResTiling()->UpdateAllRequiredStateForTesting();
+  active_layer()->LowResTiling()->UpdateAllRequiredStateForTesting();
 
-  AssertAllTilesRequired(pending_layer_->HighResTiling());
-  AssertAllTilesRequired(active_layer_->HighResTiling());
-  AssertNoTilesRequired(active_layer_->LowResTiling());
+  AssertAllTilesRequired(pending_layer()->HighResTiling());
+  AssertAllTilesRequired(active_layer()->HighResTiling());
+  AssertNoTilesRequired(active_layer()->LowResTiling());
 }
 
 TEST_F(PictureLayerImplTest, ActivateUninitializedLayer) {
   gfx::Size layer_bounds(400, 400);
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
-  host_impl_.CreatePendingTree();
-  LayerTreeImpl* pending_tree = host_impl_.pending_tree();
+  host_impl()->CreatePendingTree();
+  LayerTreeImpl* pending_tree = host_impl()->pending_tree();
 
   std::unique_ptr<FakePictureLayerImpl> pending_layer =
-      FakePictureLayerImpl::CreateWithRasterSource(pending_tree, id_,
+      FakePictureLayerImpl::CreateWithRasterSource(pending_tree, layer_id(),
                                                    pending_raster_source);
   pending_layer->SetDrawsContent(true);
   pending_tree->SetRootLayer(std::move(pending_layer));
 
-  pending_layer_ = static_cast<FakePictureLayerImpl*>(
-      host_impl_.pending_tree()->LayerById(id_));
+  FakePictureLayerImpl* raw_pending_layer = static_cast<FakePictureLayerImpl*>(
+      host_impl()->pending_tree()->LayerById(layer_id()));
 
   // Set some state on the pending layer, make sure it is not clobbered
   // by a sync from the active layer.  This could happen because if the
   // pending layer has not been post-commit initialized it will attempt
   // to sync from the active layer.
-  float raster_page_scale = 10.f * pending_layer_->raster_page_scale();
-  pending_layer_->set_raster_page_scale(raster_page_scale);
+  float raster_page_scale = 10.f * raw_pending_layer->raster_page_scale();
+  raw_pending_layer->set_raster_page_scale(raster_page_scale);
 
-  host_impl_.ActivateSyncTree();
+  host_impl()->ActivateSyncTree();
 
-  active_layer_ = static_cast<FakePictureLayerImpl*>(
-      host_impl_.active_tree()->LayerById(id_));
+  FakePictureLayerImpl* raw_active_layer = static_cast<FakePictureLayerImpl*>(
+      host_impl()->active_tree()->LayerById(layer_id()));
 
-  EXPECT_EQ(0u, active_layer_->num_tilings());
-  EXPECT_EQ(raster_page_scale, active_layer_->raster_page_scale());
+  EXPECT_EQ(0u, raw_active_layer->num_tilings());
+  EXPECT_EQ(raster_page_scale, raw_active_layer->raster_page_scale());
 }
 
 TEST_F(PictureLayerImplTest, ShareTilesOnNextFrame) {
   gfx::Size layer_bounds(1500, 1500);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   SetupPendingTree(pending_raster_source);
 
-  PictureLayerTiling* tiling = pending_layer_->HighResTiling();
+  PictureLayerTiling* tiling = pending_layer()->HighResTiling();
   gfx::Rect first_invalidate = tiling->TilingDataForTesting().TileBounds(0, 0);
   first_invalidate.Inset(tiling->TilingDataForTesting().border_texels(),
                          tiling->TilingDataForTesting().border_texels());
   gfx::Rect second_invalidate = tiling->TilingDataForTesting().TileBounds(1, 1);
   second_invalidate.Inset(tiling->TilingDataForTesting().border_texels(),
                           tiling->TilingDataForTesting().border_texels());
 
   ActivateTree();
 
   // Make a pending tree with an invalidated raster tile 0,0.
   SetupPendingTreeWithInvalidation(pending_raster_source, first_invalidate);
 
   // Activate and make a pending tree with an invalidated raster tile 1,1.
   ActivateTree();
 
   SetupPendingTreeWithInvalidation(pending_raster_source, second_invalidate);
 
-  PictureLayerTiling* pending_tiling = pending_layer_->tilings()->tiling_at(0);
-  PictureLayerTiling* active_tiling = active_layer_->tilings()->tiling_at(0);
+  PictureLayerTiling* pending_tiling = pending_layer()->tilings()->tiling_at(0);
+  PictureLayerTiling* active_tiling = active_layer()->tilings()->tiling_at(0);
 
   // Tile 0,0 not exist on pending, but tile 1,1 should.
   EXPECT_TRUE(active_tiling->TileAt(0, 0));
   EXPECT_TRUE(active_tiling->TileAt(1, 0));
   EXPECT_TRUE(active_tiling->TileAt(0, 1));
   EXPECT_FALSE(pending_tiling->TileAt(0, 0));
   EXPECT_FALSE(pending_tiling->TileAt(1, 0));
   EXPECT_FALSE(pending_tiling->TileAt(0, 1));
   EXPECT_NE(active_tiling->TileAt(1, 1), pending_tiling->TileAt(1, 1));
   EXPECT_TRUE(active_tiling->TileAt(1, 1));
   EXPECT_TRUE(pending_tiling->TileAt(1, 1));
 
   // Drop the tiles on the active tree and recreate them.
-  active_layer_->tilings()->UpdateTilePriorities(gfx::Rect(), 1.f, 1.0,
-                                                 Occlusion(), true);
+  active_layer()->tilings()->UpdateTilePriorities(gfx::Rect(), 1.f, 1.0,
+                                                  Occlusion(), true);
   EXPECT_TRUE(active_tiling->AllTilesForTesting().empty());
   active_tiling->CreateAllTilesForTesting();
 
   // Tile 0,0 not exist on pending, but tile 1,1 should.
   EXPECT_TRUE(active_tiling->TileAt(0, 0));
   EXPECT_TRUE(active_tiling->TileAt(1, 0));
   EXPECT_TRUE(active_tiling->TileAt(0, 1));
   EXPECT_FALSE(pending_tiling->TileAt(0, 0));
   EXPECT_FALSE(pending_tiling->TileAt(1, 0));
   EXPECT_FALSE(pending_tiling->TileAt(0, 1));
   EXPECT_NE(active_tiling->TileAt(1, 1), pending_tiling->TileAt(1, 1));
   EXPECT_TRUE(active_tiling->TileAt(1, 1));
   EXPECT_TRUE(pending_tiling->TileAt(1, 1));
 }
 
 TEST_F(PictureLayerImplTest, PendingHasNoTilesWithNoInvalidation) {
   SetupDefaultTrees(gfx::Size(1500, 1500));
 
-  EXPECT_GE(active_layer_->num_tilings(), 1u);
-  EXPECT_GE(pending_layer_->num_tilings(), 1u);
+  EXPECT_GE(active_layer()->num_tilings(), 1u);
+  EXPECT_GE(pending_layer()->num_tilings(), 1u);
 
   // No invalidation.
-  PictureLayerTiling* active_tiling = active_layer_->tilings()->tiling_at(0);
-  PictureLayerTiling* pending_tiling = pending_layer_->tilings()->tiling_at(0);
+  PictureLayerTiling* active_tiling = active_layer()->tilings()->tiling_at(0);
+  PictureLayerTiling* pending_tiling = pending_layer()->tilings()->tiling_at(0);
   ASSERT_TRUE(active_tiling);
   ASSERT_TRUE(pending_tiling);
 
   EXPECT_TRUE(active_tiling->TileAt(0, 0));
   EXPECT_TRUE(active_tiling->TileAt(1, 0));
   EXPECT_TRUE(active_tiling->TileAt(0, 1));
   EXPECT_TRUE(active_tiling->TileAt(1, 1));
 
   EXPECT_FALSE(pending_tiling->TileAt(0, 0));
   EXPECT_FALSE(pending_tiling->TileAt(1, 0));
@@ skipping 10 matching lines @@
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupTreesWithInvalidation(pending_raster_source, active_raster_source,
                              gfx::Rect(1, 1));
   // Activate the invalidation.
   ActivateTree();
   // Make another pending tree without any invalidation in it.
   scoped_refptr<FakeRasterSource> pending_raster_source2 =
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupPendingTree(pending_raster_source2);
 
-  EXPECT_GE(active_layer_->num_tilings(), 1u);
-  EXPECT_GE(pending_layer_->num_tilings(), 1u);
+  EXPECT_GE(active_layer()->num_tilings(), 1u);
+  EXPECT_GE(pending_layer()->num_tilings(), 1u);
 
   // The active tree invalidation was handled by the active tiles.
-  PictureLayerTiling* active_tiling = active_layer_->tilings()->tiling_at(0);
-  PictureLayerTiling* pending_tiling = pending_layer_->tilings()->tiling_at(0);
+  PictureLayerTiling* active_tiling = active_layer()->tilings()->tiling_at(0);
+  PictureLayerTiling* pending_tiling = pending_layer()->tilings()->tiling_at(0);
   ASSERT_TRUE(active_tiling);
   ASSERT_TRUE(pending_tiling);
 
   EXPECT_TRUE(active_tiling->TileAt(0, 0));
   EXPECT_TRUE(active_tiling->TileAt(1, 0));
   EXPECT_TRUE(active_tiling->TileAt(0, 1));
   EXPECT_TRUE(active_tiling->TileAt(1, 1));
 
   EXPECT_FALSE(pending_tiling->TileAt(0, 0));
   EXPECT_FALSE(pending_tiling->TileAt(1, 0));
   EXPECT_FALSE(pending_tiling->TileAt(0, 1));
   EXPECT_FALSE(pending_tiling->TileAt(1, 1));
 }
 
 TEST_F(PictureLayerImplTest, RecreateInvalidPendingTreeTiles) {
   // Set some invalidation on the pending tree. We should replace raster tiles
   // that touch this.
   SetupDefaultTreesWithInvalidation(gfx::Size(1500, 1500), gfx::Rect(1, 1));
 
-  EXPECT_GE(active_layer_->num_tilings(), 1u);
-  EXPECT_GE(pending_layer_->num_tilings(), 1u);
+  EXPECT_GE(active_layer()->num_tilings(), 1u);
+  EXPECT_GE(pending_layer()->num_tilings(), 1u);
 
   // The pending tree invalidation creates tiles on the pending tree.
-  PictureLayerTiling* active_tiling = active_layer_->tilings()->tiling_at(0);
-  PictureLayerTiling* pending_tiling = pending_layer_->tilings()->tiling_at(0);
+  PictureLayerTiling* active_tiling = active_layer()->tilings()->tiling_at(0);
+  PictureLayerTiling* pending_tiling = pending_layer()->tilings()->tiling_at(0);
   ASSERT_TRUE(active_tiling);
   ASSERT_TRUE(pending_tiling);
 
   EXPECT_TRUE(active_tiling->TileAt(0, 0));
   EXPECT_TRUE(active_tiling->TileAt(1, 0));
   EXPECT_TRUE(active_tiling->TileAt(0, 1));
   EXPECT_TRUE(active_tiling->TileAt(1, 1));
 
   EXPECT_TRUE(pending_tiling->TileAt(0, 0));
   EXPECT_FALSE(pending_tiling->TileAt(1, 0));
   EXPECT_FALSE(pending_tiling->TileAt(0, 1));
   EXPECT_FALSE(pending_tiling->TileAt(1, 1));
 
   EXPECT_NE(active_tiling->TileAt(0, 0), pending_tiling->TileAt(0, 0));
 }
 
 TEST_F(PictureLayerImplTest, SyncTilingAfterGpuRasterizationToggles) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size layer_bounds(10, 10);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   SetupTrees(pending_raster_source, active_raster_source);
 
-  EXPECT_TRUE(pending_layer_->tilings()->FindTilingWithScale(1.f));
-  EXPECT_TRUE(active_layer_->tilings()->FindTilingWithScale(1.f));
+  EXPECT_TRUE(pending_layer()->tilings()->FindTilingWithScale(1.f));
+  EXPECT_TRUE(active_layer()->tilings()->FindTilingWithScale(1.f));
 
   // Gpu rasterization is disabled by default.
-  EXPECT_FALSE(host_impl_.use_gpu_rasterization());
+  EXPECT_FALSE(host_impl()->use_gpu_rasterization());
   // Toggling the gpu rasterization clears all tilings on both trees.
-  host_impl_.SetHasGpuRasterizationTrigger(true);
-  host_impl_.SetContentIsSuitableForGpuRasterization(true);
-  host_impl_.UpdateTreeResourcesForGpuRasterizationIfNeeded();
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
-  EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
+  host_impl()->SetHasGpuRasterizationTrigger(true);
+  host_impl()->SetContentIsSuitableForGpuRasterization(true);
+  host_impl()->UpdateTreeResourcesForGpuRasterizationIfNeeded();
+  EXPECT_EQ(0u, pending_layer()->tilings()->num_tilings());
+  EXPECT_EQ(0u, active_layer()->tilings()->num_tilings());
 
   // Make sure that we can still add tiling to the pending layer,
   // that gets synced to the active layer.
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
   bool update_lcd_text = false;
-  host_impl_.pending_tree()->UpdateDrawProperties(update_lcd_text);
-  EXPECT_TRUE(pending_layer_->tilings()->FindTilingWithScale(1.f));
+  host_impl()->pending_tree()->UpdateDrawProperties(update_lcd_text);
+  EXPECT_TRUE(pending_layer()->tilings()->FindTilingWithScale(1.f));
 
   ActivateTree();
-  EXPECT_TRUE(active_layer_->tilings()->FindTilingWithScale(1.f));
+  EXPECT_TRUE(active_layer()->tilings()->FindTilingWithScale(1.f));
 
   SetupPendingTree(pending_raster_source);
-  EXPECT_TRUE(pending_layer_->tilings()->FindTilingWithScale(1.f));
+  EXPECT_TRUE(pending_layer()->tilings()->FindTilingWithScale(1.f));
 
   // Toggling the gpu rasterization clears all tilings on both trees.
-  EXPECT_TRUE(host_impl_.use_gpu_rasterization());
-  host_impl_.SetHasGpuRasterizationTrigger(false);
-  host_impl_.UpdateTreeResourcesForGpuRasterizationIfNeeded();
+  EXPECT_TRUE(host_impl()->use_gpu_rasterization());
+  host_impl()->SetHasGpuRasterizationTrigger(false);
+  host_impl()->UpdateTreeResourcesForGpuRasterizationIfNeeded();
   EXPECT_EQ(GpuRasterizationStatus::OFF_VIEWPORT,
-            host_impl_.gpu_rasterization_status());
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
-  EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
+            host_impl()->gpu_rasterization_status());
+  EXPECT_EQ(0u, pending_layer()->tilings()->num_tilings());
+  EXPECT_EQ(0u, active_layer()->tilings()->num_tilings());
 
-  host_impl_.SetHasGpuRasterizationTrigger(true);
-  host_impl_.SetContentIsSuitableForGpuRasterization(false);
+  host_impl()->SetHasGpuRasterizationTrigger(true);
+  host_impl()->SetContentIsSuitableForGpuRasterization(false);
   EXPECT_EQ(GpuRasterizationStatus::OFF_CONTENT,
-            host_impl_.gpu_rasterization_status());
+            host_impl()->gpu_rasterization_status());
 }
 
 TEST_F(PictureLayerImplTest, HighResCreatedWhenBoundsShrink) {
   // Put 0.5 as high res.
   SetInitialDeviceScaleFactor(0.5f);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(gfx::Size(10, 10));
   SetupPendingTree(pending_raster_source);
 
   // Sanity checks.
-  EXPECT_EQ(1u, pending_layer_->tilings()->num_tilings());
-  EXPECT_TRUE(pending_layer_->tilings()->FindTilingWithScale(0.5f));
+  EXPECT_EQ(1u, pending_layer()->tilings()->num_tilings());
+  EXPECT_TRUE(pending_layer()->tilings()->FindTilingWithScale(0.5f));
 
   ActivateTree();
 
   // Now, set the bounds to be 1x1, so that minimum contents scale becomes 1.
   pending_raster_source = FakeRasterSource::CreateFilled(gfx::Size(1, 1));
   SetupPendingTree(pending_raster_source);
 
   // Another sanity check.
-  EXPECT_EQ(1.f, pending_layer_->MinimumContentsScale());
+  EXPECT_EQ(1.f, pending_layer()->MinimumContentsScale());
 
   // Since the MinContentsScale is 1, the 0.5 tiling should have been replaced
   // by a 1.0 tiling during the UDP in SetupPendingTree.
-  EXPECT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  EXPECT_EQ(1u, pending_layer()->tilings()->num_tilings());
   PictureLayerTiling* tiling =
-      pending_layer_->tilings()->FindTilingWithScale(1.0f);
+      pending_layer()->tilings()->FindTilingWithScale(1.0f);
   ASSERT_TRUE(tiling);
   EXPECT_EQ(HIGH_RESOLUTION, tiling->resolution());
 }
 
 TEST_F(PictureLayerImplTest, LowResTilingWithoutGpuRasterization) {
-  gfx::Size default_tile_size(host_impl_.settings().default_tile_size);
+  gfx::Size default_tile_size(host_impl()->settings().default_tile_size);
   gfx::Size layer_bounds(default_tile_size.width() * 4,
                          default_tile_size.height() * 4);
 
-  host_impl_.SetHasGpuRasterizationTrigger(false);
+  host_impl()->SetHasGpuRasterizationTrigger(false);
 
   SetupDefaultTrees(layer_bounds);
-  EXPECT_FALSE(host_impl_.use_gpu_rasterization());
+  EXPECT_FALSE(host_impl()->use_gpu_rasterization());
   // Should have only a high-res tiling.
-  EXPECT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  EXPECT_EQ(1u, pending_layer()->tilings()->num_tilings());
   ActivateTree();
   // Should add a high and a low res for active tree.
-  EXPECT_EQ(2u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(2u, active_layer()->tilings()->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, NoLowResTilingWithGpuRasterization) {
-  gfx::Size default_tile_size(host_impl_.settings().default_tile_size);
+  gfx::Size default_tile_size(host_impl()->settings().default_tile_size);
   gfx::Size layer_bounds(default_tile_size.width() * 4,
                          default_tile_size.height() * 4);
 
-  host_impl_.SetHasGpuRasterizationTrigger(true);
-  host_impl_.SetContentIsSuitableForGpuRasterization(true);
+  host_impl()->SetHasGpuRasterizationTrigger(true);
+  host_impl()->SetContentIsSuitableForGpuRasterization(true);
 
   SetupDefaultTrees(layer_bounds);
-  EXPECT_TRUE(host_impl_.use_gpu_rasterization());
+  EXPECT_TRUE(host_impl()->use_gpu_rasterization());
   // Should only have the high-res tiling.
-  EXPECT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  EXPECT_EQ(1u, pending_layer()->tilings()->num_tilings());
   ActivateTree();
   // Should only have the high-res tiling.
-  EXPECT_EQ(1u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(1u, active_layer()->tilings()->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, RequiredTilesWithGpuRasterization) {
-  host_impl_.SetHasGpuRasterizationTrigger(true);
-  host_impl_.SetContentIsSuitableForGpuRasterization(true);
+  host_impl()->SetHasGpuRasterizationTrigger(true);
+  host_impl()->SetContentIsSuitableForGpuRasterization(true);
 
   gfx::Size viewport_size(1000, 1000);
-  host_impl_.SetViewportSize(viewport_size);
+  host_impl()->SetViewportSize(viewport_size);
 
   gfx::Size layer_bounds(4000, 4000);
   SetupDefaultTrees(layer_bounds);
-  EXPECT_TRUE(host_impl_.use_gpu_rasterization());
+  EXPECT_TRUE(host_impl()->use_gpu_rasterization());
 
   // Should only have the high-res tiling.
-  EXPECT_EQ(1u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(1u, active_layer()->tilings()->num_tilings());
 
-  active_layer_->HighResTiling()->UpdateAllRequiredStateForTesting();
+  active_layer()->HighResTiling()->UpdateAllRequiredStateForTesting();
 
   // High res tiling should have 64 tiles (4x16 tile grid).
-  EXPECT_EQ(64u, active_layer_->HighResTiling()->AllTilesForTesting().size());
+  EXPECT_EQ(64u, active_layer()->HighResTiling()->AllTilesForTesting().size());
 
   // Visible viewport should be covered by 4 tiles.  No other
   // tiles should be required for activation.
-  EXPECT_EQ(4u, NumberOfTilesRequired(active_layer_->HighResTiling()));
+  EXPECT_EQ(4u, NumberOfTilesRequired(active_layer()->HighResTiling()));
 }
 
 TEST_F(PictureLayerImplTest, NoTilingIfDoesNotDrawContent) {
   // Set up layers with tilings.
   SetupDefaultTrees(gfx::Size(10, 10));
   SetContentsScaleOnBothLayers(1.f, 1.f, 1.f, 1.f, 0.f, false);
-  pending_layer_->PushPropertiesTo(active_layer_);
-  EXPECT_TRUE(pending_layer_->DrawsContent());
-  EXPECT_TRUE(pending_layer_->CanHaveTilings());
-  EXPECT_GE(pending_layer_->num_tilings(), 0u);
-  EXPECT_GE(active_layer_->num_tilings(), 0u);
+  pending_layer()->PushPropertiesTo(active_layer());
+  EXPECT_TRUE(pending_layer()->DrawsContent());
+  EXPECT_TRUE(pending_layer()->CanHaveTilings());
+  EXPECT_GE(pending_layer()->num_tilings(), 0u);
+  EXPECT_GE(active_layer()->num_tilings(), 0u);
 
   // Set content to false, which should make CanHaveTilings return false.
-  pending_layer_->SetDrawsContent(false);
-  EXPECT_FALSE(pending_layer_->DrawsContent());
-  EXPECT_FALSE(pending_layer_->CanHaveTilings());
+  pending_layer()->SetDrawsContent(false);
+  EXPECT_FALSE(pending_layer()->DrawsContent());
+  EXPECT_FALSE(pending_layer()->CanHaveTilings());
 
   // No tilings should be pushed to active layer.
-  pending_layer_->PushPropertiesTo(active_layer_);
-  EXPECT_EQ(0u, active_layer_->num_tilings());
+  pending_layer()->PushPropertiesTo(active_layer());
+  EXPECT_EQ(0u, active_layer()->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, FirstTilingDuringPinch) {
   SetupDefaultTrees(gfx::Size(10, 10));
 
   // We start with a tiling at scale 1.
-  EXPECT_EQ(1.f, pending_layer_->HighResTiling()->contents_scale());
+  EXPECT_EQ(1.f, pending_layer()->HighResTiling()->contents_scale());
 
   // When we page scale up by 2.3, we get a new tiling that is a power of 2, in
   // this case 4.
-  host_impl_.PinchGestureBegin();
+  host_impl()->PinchGestureBegin();
   float high_res_scale = 2.3f;
   SetContentsScaleOnBothLayers(high_res_scale, 1.f, high_res_scale, 1.f, 0.f,
                                false);
-  EXPECT_EQ(4.f, pending_layer_->HighResTiling()->contents_scale());
+  EXPECT_EQ(4.f, pending_layer()->HighResTiling()->contents_scale());
 }
 
 TEST_F(PictureLayerImplTest, PinchingTooSmall) {
   SetupDefaultTrees(gfx::Size(10, 10));
 
   // We start with a tiling at scale 1.
-  EXPECT_EQ(1.f, pending_layer_->HighResTiling()->contents_scale());
+  EXPECT_EQ(1.f, pending_layer()->HighResTiling()->contents_scale());
 
-  host_impl_.PinchGestureBegin();
+  host_impl()->PinchGestureBegin();
   float high_res_scale = 0.0001f;
-  EXPECT_LT(high_res_scale, pending_layer_->MinimumContentsScale());
+  EXPECT_LT(high_res_scale, pending_layer()->MinimumContentsScale());
 
   SetContentsScaleOnBothLayers(high_res_scale, 1.f, high_res_scale, 1.f, 0.f,
                                false);
-  EXPECT_FLOAT_EQ(pending_layer_->MinimumContentsScale(),
-                  pending_layer_->HighResTiling()->contents_scale());
+  EXPECT_FLOAT_EQ(pending_layer()->MinimumContentsScale(),
+                  pending_layer()->HighResTiling()->contents_scale());
 }
 
 TEST_F(PictureLayerImplTest, PinchingTooSmallWithContentsScale) {
   SetupDefaultTrees(gfx::Size(10, 10));
 
   ResetTilingsAndRasterScales();
 
   float contents_scale = 0.15f;
   SetContentsScaleOnBothLayers(contents_scale, 1.f, 1.f, 1.f, 0.f, false);
 
-  ASSERT_GE(pending_layer_->num_tilings(), 0u);
+  ASSERT_GE(pending_layer()->num_tilings(), 0u);
   EXPECT_FLOAT_EQ(contents_scale,
-                  pending_layer_->HighResTiling()->contents_scale());
+                  pending_layer()->HighResTiling()->contents_scale());
 
-  host_impl_.PinchGestureBegin();
+  host_impl()->PinchGestureBegin();
 
   float page_scale = 0.0001f;
   EXPECT_LT(page_scale * contents_scale,
-            pending_layer_->MinimumContentsScale());
+            pending_layer()->MinimumContentsScale());
 
   SetContentsScaleOnBothLayers(contents_scale * page_scale, 1.f, page_scale,
                                1.f, 0.f, false);
-  ASSERT_GE(pending_layer_->num_tilings(), 0u);
-  EXPECT_FLOAT_EQ(pending_layer_->MinimumContentsScale(),
-                  pending_layer_->HighResTiling()->contents_scale());
+  ASSERT_GE(pending_layer()->num_tilings(), 0u);
+  EXPECT_FLOAT_EQ(pending_layer()->MinimumContentsScale(),
+                  pending_layer()->HighResTiling()->contents_scale());
 }
 
 TEST_F(PictureLayerImplTest, ConsiderAnimationStartScaleForRasterScale) {
   gfx::Size viewport_size(1000, 1000);
-  host_impl_.SetViewportSize(viewport_size);
+  host_impl()->SetViewportSize(viewport_size);
 
   gfx::Size layer_bounds(100, 100);
   SetupDefaultTrees(layer_bounds);
 
   float contents_scale = 2.f;
   float device_scale = 1.f;
   float page_scale = 1.f;
   float maximum_animation_scale = 3.f;
   float starting_animation_scale = 1.f;
   bool animating_transform = true;
@@ skipping 37 matching lines @@
   starting_animation_scale = 11.f;
 
   SetContentsScaleOnBothLayers(contents_scale, device_scale, page_scale,
                                maximum_animation_scale,
                                starting_animation_scale, animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 3.f);
 }
 
 TEST_F(PictureLayerImplTest, HighResTilingDuringAnimationForCpuRasterization) {
   gfx::Size viewport_size(1000, 1000);
-  host_impl_.SetViewportSize(viewport_size);
+  host_impl()->SetViewportSize(viewport_size);
 
   gfx::Size layer_bounds(100, 100);
   SetupDefaultTrees(layer_bounds);
 
   float contents_scale = 1.f;
   float device_scale = 1.f;
   float page_scale = 1.f;
   float maximum_animation_scale = 1.f;
   float starting_animation_scale = 0.f;
   bool animating_transform = false;
@@ skipping 122 matching lines @@
   SetContentsScaleOnBothLayers(contents_scale, device_scale, page_scale,
                                maximum_animation_scale,
                                starting_animation_scale, animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 11.f);
 }
 
 TEST_F(PictureLayerImplTest, HighResTilingDuringAnimationForGpuRasterization) {
   gfx::Size layer_bounds(100, 100);
   gfx::Size viewport_size(1000, 1000);
   SetupDefaultTrees(layer_bounds);
-  host_impl_.SetViewportSize(viewport_size);
-  host_impl_.SetHasGpuRasterizationTrigger(true);
-  host_impl_.SetContentIsSuitableForGpuRasterization(true);
-  host_impl_.UpdateTreeResourcesForGpuRasterizationIfNeeded();
+  host_impl()->SetViewportSize(viewport_size);
+  host_impl()->SetHasGpuRasterizationTrigger(true);
+  host_impl()->SetContentIsSuitableForGpuRasterization(true);
+  host_impl()->UpdateTreeResourcesForGpuRasterizationIfNeeded();
 
   float contents_scale = 1.f;
   float device_scale = 1.3f;
   float page_scale = 1.4f;
   float maximum_animation_scale = 1.f;
   float starting_animation_scale = 0.f;
   bool animating_transform = false;
 
   SetContentsScaleOnBothLayers(contents_scale, device_scale, page_scale,
                                maximum_animation_scale,
@@ skipping 35 matching lines @@
   contents_scale = 4.f;
   animating_transform = false;
 
   SetContentsScaleOnBothLayers(contents_scale, device_scale, page_scale,
                                maximum_animation_scale,
                                starting_animation_scale, animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 4.f);
 }
 
 TEST_F(PictureLayerImplTest, TilingSetRasterQueue) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
-  host_impl_.SetViewportSize(gfx::Size(500, 500));
+  host_impl()->SetViewportSize(gfx::Size(500, 500));
 
   gfx::Size layer_bounds(1000, 1000);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   SetupPendingTree(pending_raster_source);
-  EXPECT_EQ(1u, pending_layer_->num_tilings());
+  EXPECT_EQ(1u, pending_layer()->num_tilings());
 
   std::set<Tile*> unique_tiles;
   bool reached_prepaint = false;
   int non_ideal_tile_count = 0u;
   int low_res_tile_count = 0u;
   int high_res_tile_count = 0u;
   int high_res_now_tiles = 0u;
   std::unique_ptr<TilingSetRasterQueueAll> queue(new TilingSetRasterQueueAll(
-      pending_layer_->picture_layer_tiling_set(), false));
+      pending_layer()->picture_layer_tiling_set(), false));
   while (!queue->IsEmpty()) {
     PrioritizedTile prioritized_tile = queue->Top();
     TilePriority priority = prioritized_tile.priority();
 
     EXPECT_TRUE(prioritized_tile.tile());
 
     // Non-high res tiles only get visible tiles. Also, prepaint should only
     // come at the end of the iteration.
     if (priority.resolution != HIGH_RESOLUTION) {
       EXPECT_EQ(TilePriority::NOW, priority.priority_bin);
@@ skipping 19 matching lines @@
 
   // With layer size being 1000x1000 and default tile size 256x256, we expect to
   // see 4 now tiles out of 16 total high res tiles.
   EXPECT_EQ(16, high_res_tile_count);
   EXPECT_EQ(4, high_res_now_tiles);
   EXPECT_EQ(low_res_tile_count + high_res_tile_count + non_ideal_tile_count,
             static_cast<int>(unique_tiles.size()));
 
   std::unique_ptr<TilingSetRasterQueueRequired> required_queue(
       new TilingSetRasterQueueRequired(
-          pending_layer_->picture_layer_tiling_set(),
+          pending_layer()->picture_layer_tiling_set(),
           RasterTilePriorityQueue::Type::REQUIRED_FOR_DRAW));
   EXPECT_TRUE(required_queue->IsEmpty());
 
   required_queue.reset(new TilingSetRasterQueueRequired(
-      pending_layer_->picture_layer_tiling_set(),
+      pending_layer()->picture_layer_tiling_set(),
       RasterTilePriorityQueue::Type::REQUIRED_FOR_ACTIVATION));
   EXPECT_FALSE(required_queue->IsEmpty());
   int required_for_activation_count = 0;
   while (!required_queue->IsEmpty()) {
     PrioritizedTile prioritized_tile = required_queue->Top();
     EXPECT_TRUE(prioritized_tile.tile()->required_for_activation());
     EXPECT_FALSE(prioritized_tile.tile()->draw_info().IsReadyToDraw());
     ++required_for_activation_count;
     required_queue->Pop();
   }
 
   // All of the high res tiles should be required for activation, since there is
   // no active twin.
   EXPECT_EQ(high_res_now_tiles, required_for_activation_count);
 
   // No NOW tiles.
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
 
-  pending_layer_->draw_properties().visible_layer_rect =
+  pending_layer()->draw_properties().visible_layer_rect =
       gfx::Rect(1100, 1100, 500, 500);
-  pending_layer_->UpdateTiles();
+  pending_layer()->UpdateTiles();
 
   unique_tiles.clear();
   high_res_tile_count = 0u;
   queue.reset(new TilingSetRasterQueueAll(
-      pending_layer_->picture_layer_tiling_set(), false));
+      pending_layer()->picture_layer_tiling_set(), false));
   while (!queue->IsEmpty()) {
     PrioritizedTile prioritized_tile = queue->Top();
     TilePriority priority = prioritized_tile.priority();
 
     EXPECT_TRUE(prioritized_tile.tile());
 
     // Non-high res tiles only get visible tiles.
     EXPECT_EQ(HIGH_RESOLUTION, priority.resolution);
     EXPECT_NE(TilePriority::NOW, priority.priority_bin);
 
     high_res_tile_count += priority.resolution == HIGH_RESOLUTION;
 
     unique_tiles.insert(prioritized_tile.tile());
     queue->Pop();
   }
 
   EXPECT_EQ(16, high_res_tile_count);
   EXPECT_EQ(high_res_tile_count, static_cast<int>(unique_tiles.size()));
 
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
 
-  pending_layer_->draw_properties().visible_layer_rect =
+  pending_layer()->draw_properties().visible_layer_rect =
       gfx::Rect(0, 0, 500, 500);
-  pending_layer_->UpdateTiles();
+  pending_layer()->UpdateTiles();
 
   std::vector<Tile*> high_res_tiles =
-      pending_layer_->HighResTiling()->AllTilesForTesting();
+      pending_layer()->HighResTiling()->AllTilesForTesting();
   for (std::vector<Tile*>::iterator tile_it = high_res_tiles.begin();
        tile_it != high_res_tiles.end();
        ++tile_it) {
     Tile* tile = *tile_it;
     TileDrawInfo& draw_info = tile->draw_info();
     draw_info.SetSolidColorForTesting(SK_ColorRED);
   }
 
   queue.reset(new TilingSetRasterQueueAll(
-      pending_layer_->picture_layer_tiling_set(), true));
+      pending_layer()->picture_layer_tiling_set(), true));
   EXPECT_TRUE(queue->IsEmpty());
 }
 
 TEST_F(PictureLayerImplTest, TilingSetRasterQueueActiveTree) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
-  host_impl_.SetViewportSize(gfx::Size(500, 500));
+  host_impl()->SetViewportSize(gfx::Size(500, 500));
 
   gfx::Size layer_bounds(1000, 1000);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   SetupPendingTree(pending_raster_source);
   ActivateTree();
-  EXPECT_EQ(2u, active_layer_->num_tilings());
+  EXPECT_EQ(2u, active_layer()->num_tilings());
 
   std::unique_ptr<TilingSetRasterQueueRequired> queue(
       new TilingSetRasterQueueRequired(
-          active_layer_->picture_layer_tiling_set(),
+          active_layer()->picture_layer_tiling_set(),
           RasterTilePriorityQueue::Type::REQUIRED_FOR_DRAW));
   EXPECT_FALSE(queue->IsEmpty());
   while (!queue->IsEmpty()) {
     PrioritizedTile prioritized_tile = queue->Top();
     EXPECT_TRUE(prioritized_tile.tile()->required_for_draw());
     EXPECT_FALSE(prioritized_tile.tile()->draw_info().IsReadyToDraw());
     queue->Pop();
   }
 
   queue.reset(new TilingSetRasterQueueRequired(
-      active_layer_->picture_layer_tiling_set(),
+      active_layer()->picture_layer_tiling_set(),
       RasterTilePriorityQueue::Type::REQUIRED_FOR_ACTIVATION));
   EXPECT_TRUE(queue->IsEmpty());
 }
 
 TEST_F(PictureLayerImplTest, TilingSetRasterQueueRequiredNoHighRes) {
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilledSolidColor(gfx::Size(1024, 1024));
 
   SetupPendingTree(pending_raster_source);
   EXPECT_FALSE(
-      pending_layer_->picture_layer_tiling_set()->FindTilingWithResolution(
+      pending_layer()->picture_layer_tiling_set()->FindTilingWithResolution(
           HIGH_RESOLUTION));
 
   std::unique_ptr<TilingSetRasterQueueRequired> queue(
       new TilingSetRasterQueueRequired(
-          pending_layer_->picture_layer_tiling_set(),
+          pending_layer()->picture_layer_tiling_set(),
           RasterTilePriorityQueue::Type::REQUIRED_FOR_ACTIVATION));
   EXPECT_TRUE(queue->IsEmpty());
 }
 
 TEST_F(PictureLayerImplTest, TilingSetEvictionQueue) {
   gfx::Size layer_bounds(1000, 1000);
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  float low_res_factor = host_impl()->settings().low_res_contents_scale_factor;
 
-  host_impl_.SetViewportSize(gfx::Size(500, 500));
+  host_impl()->SetViewportSize(gfx::Size(500, 500));
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   // TODO(vmpstr): Add a test with tilings other than high res on the active
   // tree (crbug.com/519607).
   SetupPendingTree(pending_raster_source);
-  EXPECT_EQ(1u, pending_layer_->num_tilings());
+  EXPECT_EQ(1u, pending_layer()->num_tilings());
 
   std::vector<Tile*> all_tiles;
-  for (size_t i = 0; i < pending_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* tiling = pending_layer_->tilings()->tiling_at(i);
+  for (size_t i = 0; i < pending_layer()->num_tilings(); ++i) {
+    PictureLayerTiling* tiling = pending_layer()->tilings()->tiling_at(i);
     std::vector<Tile*> tiles = tiling->AllTilesForTesting();
     all_tiles.insert(all_tiles.end(), tiles.begin(), tiles.end());
   }
 
   std::set<Tile*> all_tiles_set(all_tiles.begin(), all_tiles.end());
 
   bool mark_required = false;
   size_t number_of_marked_tiles = 0u;
   size_t number_of_unmarked_tiles = 0u;
-  for (size_t i = 0; i < pending_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* tiling = pending_layer_->tilings()->tiling_at(i);
+  for (size_t i = 0; i < pending_layer()->num_tilings(); ++i) {
+    PictureLayerTiling* tiling = pending_layer()->tilings()->tiling_at(i);
     for (PictureLayerTiling::CoverageIterator iter(
-             tiling, 1.f, pending_layer_->visible_layer_rect());
+             tiling, 1.f, pending_layer()->visible_layer_rect());
          iter; ++iter) {
       if (mark_required) {
         number_of_marked_tiles++;
         iter->set_required_for_activation(true);
       } else {
         number_of_unmarked_tiles++;
       }
       mark_required = !mark_required;
     }
   }
 
   // Sanity checks.
   EXPECT_EQ(16u, all_tiles.size());
   EXPECT_EQ(16u, all_tiles_set.size());
   EXPECT_GT(number_of_marked_tiles, 1u);
   EXPECT_GT(number_of_unmarked_tiles, 1u);
 
   // Tiles don't have resources yet.
   std::unique_ptr<TilingSetEvictionQueue> queue(
-      new TilingSetEvictionQueue(pending_layer_->picture_layer_tiling_set()));
+      new TilingSetEvictionQueue(pending_layer()->picture_layer_tiling_set()));
   EXPECT_TRUE(queue->IsEmpty());
 
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(all_tiles);
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(
+      all_tiles);
 
   std::set<Tile*> unique_tiles;
   float expected_scales[] = {low_res_factor, 1.f};
   size_t scale_index = 0;
   bool reached_visible = false;
   PrioritizedTile last_tile;
   size_t distance_decreasing = 0;
   size_t distance_increasing = 0;
   queue.reset(
-      new TilingSetEvictionQueue(pending_layer_->picture_layer_tiling_set()));
+      new TilingSetEvictionQueue(pending_layer()->picture_layer_tiling_set()));
   while (!queue->IsEmpty()) {
     PrioritizedTile prioritized_tile = queue->Top();
     Tile* tile = prioritized_tile.tile();
     if (!last_tile.tile())
       last_tile = prioritized_tile;
 
     EXPECT_TRUE(tile);
 
     TilePriority priority = prioritized_tile.priority();
 
@@ skipping 66 matching lines @@
   EXPECT_TRUE(reached_required);
   EXPECT_EQ(all_tiles_set.size(), unique_tiles.size());
 }
 
 TEST_F(PictureLayerImplTest, Occlusion) {
   gfx::Size tile_size(102, 102);
   gfx::Size layer_bounds(1000, 1000);
   gfx::Size viewport_size(1000, 1000);
 
   LayerTestCommon::LayerImplTest impl;
-  host_impl_.SetViewportSize(viewport_size);
+  host_impl()->SetViewportSize(viewport_size);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size, Region());
   ActivateTree();
 
   std::vector<Tile*> tiles =
-      active_layer_->HighResTiling()->AllTilesForTesting();
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(tiles);
+      active_layer()->HighResTiling()->AllTilesForTesting();
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(tiles);
 
   {
     SCOPED_TRACE("No occlusion");
     gfx::Rect occluded;
-    impl.AppendQuadsWithOcclusion(active_layer_, occluded);
+    impl.AppendQuadsWithOcclusion(active_layer(), occluded);
 
     LayerTestCommon::VerifyQuadsExactlyCoverRect(impl.quad_list(),
                                                  gfx::Rect(layer_bounds));
     EXPECT_EQ(100u, impl.quad_list().size());
   }
 
   {
     SCOPED_TRACE("Full occlusion");
-    gfx::Rect occluded(active_layer_->visible_layer_rect());
-    impl.AppendQuadsWithOcclusion(active_layer_, occluded);
+    gfx::Rect occluded(active_layer()->visible_layer_rect());
+    impl.AppendQuadsWithOcclusion(active_layer(), occluded);
 
     LayerTestCommon::VerifyQuadsExactlyCoverRect(impl.quad_list(), gfx::Rect());
     EXPECT_EQ(impl.quad_list().size(), 0u);
   }
 
   {
     SCOPED_TRACE("Partial occlusion");
     gfx::Rect occluded(150, 0, 200, 1000);
-    impl.AppendQuadsWithOcclusion(active_layer_, occluded);
+    impl.AppendQuadsWithOcclusion(active_layer(), occluded);
 
     size_t partially_occluded_count = 0;
     LayerTestCommon::VerifyQuadsAreOccluded(
         impl.quad_list(), occluded, &partially_occluded_count);
     // The layer outputs one quad, which is partially occluded.
     EXPECT_EQ(100u - 10u, impl.quad_list().size());
     EXPECT_EQ(10u + 10u, partially_occluded_count);
   }
 }
 
 TEST_F(PictureLayerImplTest, RasterScaleChangeWithoutAnimation) {
-  gfx::Size tile_size(host_impl_.settings().default_tile_size);
+  gfx::Size tile_size(host_impl()->settings().default_tile_size);
   SetupDefaultTrees(tile_size);
 
   ResetTilingsAndRasterScales();
 
   float contents_scale = 2.f;
   float device_scale = 1.f;
   float page_scale = 1.f;
   float maximum_animation_scale = 1.f;
   float starting_animation_scale = 0.f;
   bool animating_transform = false;
@@ skipping 24 matching lines @@
 
 TEST_F(PictureLayerImplTest, LowResReadyToDrawNotEnoughToActivate) {
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(1000, 1000);
 
   // Make sure pending tree has tiles.
   gfx::Rect invalidation(gfx::Point(50, 50), tile_size);
   SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, invalidation);
 
   // All pending layer tiles required are not ready.
-  EXPECT_FALSE(host_impl_.tile_manager()->IsReadyToActivate());
+  EXPECT_FALSE(host_impl()->tile_manager()->IsReadyToActivate());
 
   // Initialize all low-res tiles.
-  EXPECT_FALSE(pending_layer_->LowResTiling());
-  pending_layer_->SetAllTilesReadyInTiling(active_layer_->LowResTiling());
+  EXPECT_FALSE(pending_layer()->LowResTiling());
+  pending_layer()->SetAllTilesReadyInTiling(active_layer()->LowResTiling());
 
   // Low-res tiles should not be enough.
-  EXPECT_FALSE(host_impl_.tile_manager()->IsReadyToActivate());
+  EXPECT_FALSE(host_impl()->tile_manager()->IsReadyToActivate());
 
   // Initialize remaining tiles.
-  pending_layer_->SetAllTilesReady();
-  active_layer_->SetAllTilesReady();
+  pending_layer()->SetAllTilesReady();
+  active_layer()->SetAllTilesReady();
 
-  EXPECT_TRUE(host_impl_.tile_manager()->IsReadyToActivate());
+  EXPECT_TRUE(host_impl()->tile_manager()->IsReadyToActivate());
 }
 
 TEST_F(PictureLayerImplTest, HighResReadyToDrawEnoughToActivate) {
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(1000, 1000);
 
   // Make sure pending tree has tiles.
   gfx::Rect invalidation(gfx::Point(50, 50), tile_size);
   SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, invalidation);
 
   // All pending layer tiles required are not ready.
-  EXPECT_FALSE(host_impl_.tile_manager()->IsReadyToActivate());
+  EXPECT_FALSE(host_impl()->tile_manager()->IsReadyToActivate());
 
   // Initialize all high-res tiles.
-  pending_layer_->SetAllTilesReadyInTiling(pending_layer_->HighResTiling());
-  active_layer_->SetAllTilesReadyInTiling(active_layer_->HighResTiling());
+  pending_layer()->SetAllTilesReadyInTiling(pending_layer()->HighResTiling());
+  active_layer()->SetAllTilesReadyInTiling(active_layer()->HighResTiling());
 
   // High-res tiles should be enough, since they cover everything visible.
-  EXPECT_TRUE(host_impl_.tile_manager()->IsReadyToActivate());
+  EXPECT_TRUE(host_impl()->tile_manager()->IsReadyToActivate());
 }
 
 TEST_F(PictureLayerImplTest, ActiveHighResReadyNotEnoughToActivate) {
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(1000, 1000);
 
   // Make sure pending tree has tiles.
   gfx::Rect invalidation(gfx::Point(50, 50), tile_size);
   SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, invalidation);
 
   // Initialize all high-res tiles in the active layer.
-  active_layer_->SetAllTilesReadyInTiling(active_layer_->HighResTiling());
+  active_layer()->SetAllTilesReadyInTiling(active_layer()->HighResTiling());
 
   // The pending high-res tiles are not ready, so we cannot activate.
-  EXPECT_FALSE(host_impl_.tile_manager()->IsReadyToActivate());
+  EXPECT_FALSE(host_impl()->tile_manager()->IsReadyToActivate());
 
   // When the pending high-res tiles are ready, we can activate.
-  pending_layer_->SetAllTilesReadyInTiling(pending_layer_->HighResTiling());
-  EXPECT_TRUE(host_impl_.tile_manager()->IsReadyToActivate());
+  pending_layer()->SetAllTilesReadyInTiling(pending_layer()->HighResTiling());
+  EXPECT_TRUE(host_impl()->tile_manager()->IsReadyToActivate());
 }
 
 TEST_F(NoLowResPictureLayerImplTest, ManageTilingsCreatesTilings) {
   gfx::Size layer_bounds(1300, 1900);
   SetupDefaultTrees(layer_bounds);
 
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  float low_res_factor = host_impl()->settings().low_res_contents_scale_factor;
   EXPECT_LT(low_res_factor, 1.f);
 
   ResetTilingsAndRasterScales();
 
-  SetupDrawPropertiesAndUpdateTiles(active_layer_,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(),
                                     6.f,  // ideal contents scale
                                     3.f,  // device scale
                                     2.f,  // page scale
                                     1.f,  // maximum animation scale
                                     0.f,  // starting animation scale
                                     false);
-  ASSERT_EQ(1u, active_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(6.f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+                  active_layer()->tilings()->tiling_at(0)->contents_scale());
 
   // If we change the page scale factor, then we should get new tilings.
-  SetupDrawPropertiesAndUpdateTiles(active_layer_,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(),
                                     6.6f,  // ideal contents scale
                                     3.f,   // device scale
                                     2.2f,  // page scale
                                     1.f,   // maximum animation scale
                                     0.f,   // starting animation scale
                                     false);
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  ASSERT_EQ(2u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(6.6f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+                  active_layer()->tilings()->tiling_at(0)->contents_scale());
 
   // If we change the device scale factor, then we should get new tilings.
-  SetupDrawPropertiesAndUpdateTiles(active_layer_,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(),
                                     7.26f,  // ideal contents scale
                                     3.3f,   // device scale
                                     2.2f,   // page scale
                                     1.f,    // maximum animation scale
                                     0.f,    // starting animation scale
                                     false);
-  ASSERT_EQ(3u, active_layer_->tilings()->num_tilings());
+  ASSERT_EQ(3u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(7.26f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+                  active_layer()->tilings()->tiling_at(0)->contents_scale());
 
   // If we change the device scale factor, but end up at the same total scale
   // factor somehow, then we don't get new tilings.
-  SetupDrawPropertiesAndUpdateTiles(active_layer_,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(),
                                     7.26f,  // ideal contents scale
                                     2.2f,   // device scale
                                     3.3f,   // page scale
                                     1.f,    // maximum animation scale
                                     0.f,    // starting animation scale
                                     false);
-  ASSERT_EQ(3u, active_layer_->tilings()->num_tilings());
+  ASSERT_EQ(3u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(7.26f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+                  active_layer()->tilings()->tiling_at(0)->contents_scale());
 }
 
 TEST_F(NoLowResPictureLayerImplTest, PendingLayerOnlyHasHighResTiling) {
   gfx::Size layer_bounds(1300, 1900);
   SetupDefaultTrees(layer_bounds);
 
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  float low_res_factor = host_impl()->settings().low_res_contents_scale_factor;
   EXPECT_LT(low_res_factor, 1.f);
 
   ResetTilingsAndRasterScales();
 
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(),
                                     6.f,  // ideal contents scale
                                     3.f,  // device scale
                                     2.f,  // page scale
                                     1.f,  // maximum animation scale
                                     0.f,  // starting animation scale
                                     false);
-  ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, pending_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(6.f,
-                  pending_layer_->tilings()->tiling_at(0)->contents_scale());
+                  pending_layer()->tilings()->tiling_at(0)->contents_scale());
 
   // If we change the page scale factor, then we should get new tilings.
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(),
                                     6.6f,  // ideal contents scale
                                     3.f,   // device scale
                                     2.2f,  // page scale
                                     1.f,   // maximum animation scale
                                     0.f,   // starting animation scale
                                     false);
-  ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, pending_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(6.6f,
-                  pending_layer_->tilings()->tiling_at(0)->contents_scale());
+                  pending_layer()->tilings()->tiling_at(0)->contents_scale());
 
   // If we change the device scale factor, then we should get new tilings.
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(),
                                     7.26f,  // ideal contents scale
                                     3.3f,   // device scale
                                     2.2f,   // page scale
                                     1.f,    // maximum animation scale
                                     0.f,    // starting animation scale
                                     false);
-  ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, pending_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(7.26f,
-                  pending_layer_->tilings()->tiling_at(0)->contents_scale());
+                  pending_layer()->tilings()->tiling_at(0)->contents_scale());
 
   // If we change the device scale factor, but end up at the same total scale
   // factor somehow, then we don't get new tilings.
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(),
                                     7.26f,  // ideal contents scale
                                     2.2f,   // device scale
                                     3.3f,   // page scale
                                     1.f,    // maximum animation scale
                                     0.f,    // starting animation scale
                                     false);
-  ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, pending_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(7.26f,
-                  pending_layer_->tilings()->tiling_at(0)->contents_scale());
+                  pending_layer()->tilings()->tiling_at(0)->contents_scale());
 }
 
 TEST_F(NoLowResPictureLayerImplTest, AllHighResRequiredEvenIfNotChanged) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
 
   SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, Region());
 
   Tile* some_active_tile =
-      active_layer_->HighResTiling()->AllTilesForTesting()[0];
+      active_layer()->HighResTiling()->AllTilesForTesting()[0];
   EXPECT_FALSE(some_active_tile->draw_info().IsReadyToDraw());
 
   // Since there is no invalidation, pending tree should have no tiles.
-  EXPECT_TRUE(pending_layer_->HighResTiling()->AllTilesForTesting().empty());
-  if (host_impl_.settings().create_low_res_tiling)
-    EXPECT_TRUE(pending_layer_->LowResTiling()->AllTilesForTesting().empty());
+  EXPECT_TRUE(pending_layer()->HighResTiling()->AllTilesForTesting().empty());
+  if (host_impl()->settings().create_low_res_tiling)
+    EXPECT_TRUE(pending_layer()->LowResTiling()->AllTilesForTesting().empty());
 
-  active_layer_->HighResTiling()->UpdateAllRequiredStateForTesting();
-  if (host_impl_.settings().create_low_res_tiling)
-    active_layer_->LowResTiling()->UpdateAllRequiredStateForTesting();
+  active_layer()->HighResTiling()->UpdateAllRequiredStateForTesting();
+  if (host_impl()->settings().create_low_res_tiling)
+    active_layer()->LowResTiling()->UpdateAllRequiredStateForTesting();
 
-  AssertAllTilesRequired(active_layer_->HighResTiling());
-  if (host_impl_.settings().create_low_res_tiling)
-    AssertNoTilesRequired(active_layer_->LowResTiling());
+  AssertAllTilesRequired(active_layer()->HighResTiling());
+  if (host_impl()->settings().create_low_res_tiling)
+    AssertNoTilesRequired(active_layer()->LowResTiling());
 }
 
 TEST_F(NoLowResPictureLayerImplTest, NothingRequiredIfActiveMissingTiles) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   // This raster source will create tilings, but has no recordings so will not
   // create any tiles.  This is attempting to simulate scrolling past the end of
   // recorded content on the active layer, where the recordings are so far away
   // that no tiles are created.
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreatePartiallyFilled(layer_bounds, gfx::Rect());
 
   SetupTreesWithFixedTileSize(pending_raster_source, active_raster_source,
                               tile_size, Region());
 
   // Active layer has tilings, but no tiles due to missing recordings.
-  EXPECT_TRUE(active_layer_->CanHaveTilings());
-  EXPECT_EQ(active_layer_->tilings()->num_tilings(),
-            host_impl_.settings().create_low_res_tiling ? 2u : 1u);
-  EXPECT_EQ(active_layer_->HighResTiling()->AllTilesForTesting().size(), 0u);
+  EXPECT_TRUE(active_layer()->CanHaveTilings());
+  EXPECT_EQ(active_layer()->tilings()->num_tilings(),
+            host_impl()->settings().create_low_res_tiling ? 2u : 1u);
+  EXPECT_EQ(active_layer()->HighResTiling()->AllTilesForTesting().size(), 0u);
 
   // Since the active layer has no tiles at all, the pending layer doesn't
   // need content in order to activate.
-  pending_layer_->HighResTiling()->UpdateAllRequiredStateForTesting();
-  if (host_impl_.settings().create_low_res_tiling)
-    pending_layer_->LowResTiling()->UpdateAllRequiredStateForTesting();
+  pending_layer()->HighResTiling()->UpdateAllRequiredStateForTesting();
+  if (host_impl()->settings().create_low_res_tiling)
+    pending_layer()->LowResTiling()->UpdateAllRequiredStateForTesting();
 
-  AssertNoTilesRequired(pending_layer_->HighResTiling());
-  if (host_impl_.settings().create_low_res_tiling)
-    AssertNoTilesRequired(pending_layer_->LowResTiling());
+  AssertNoTilesRequired(pending_layer()->HighResTiling());
+  if (host_impl()->settings().create_low_res_tiling)
+    AssertNoTilesRequired(pending_layer()->LowResTiling());
 }
 
 TEST_F(NoLowResPictureLayerImplTest, CleanUpTilings) {
   gfx::Size layer_bounds(1300, 1900);
   std::vector<PictureLayerTiling*> used_tilings;
   SetupDefaultTrees(layer_bounds);
 
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  float low_res_factor = host_impl()->settings().low_res_contents_scale_factor;
   EXPECT_LT(low_res_factor, 1.f);
 
   float device_scale = 1.7f;
   float page_scale = 3.2f;
   float scale = 1.f;
 
   ResetTilingsAndRasterScales();
 
   SetContentsScaleOnBothLayers(scale, device_scale, page_scale, 1.f, 0.f,
                                false);
-  ASSERT_EQ(1u, active_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, active_layer()->tilings()->num_tilings());
 
   // Ensure UpdateTiles won't remove any tilings. Note this is unrelated to
-  // |used_tilings| variable, and it's here only to ensure that active_layer_
+  // |used_tilings| variable, and it's here only to ensure that active_layer()
   // won't remove tilings before the test has a chance to verify behavior.
-  active_layer_->MarkAllTilingsUsed();
+  active_layer()->MarkAllTilingsUsed();
 
   // We only have ideal tilings, so they aren't removed.
   used_tilings.clear();
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(1u, active_layer_->tilings()->num_tilings());
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(1u, active_layer()->tilings()->num_tilings());
 
-  host_impl_.PinchGestureBegin();
+  host_impl()->PinchGestureBegin();
 
   // Changing the ideal but not creating new tilings.
   scale *= 1.5f;
   page_scale *= 1.5f;
   SetContentsScaleOnBothLayers(scale, device_scale, page_scale, 1.f, 0.f,
                                false);
-  ASSERT_EQ(1u, active_layer_->tilings()->num_tilings());
+  ASSERT_EQ(1u, active_layer()->tilings()->num_tilings());
 
   // The tilings are still our target scale, so they aren't removed.
   used_tilings.clear();
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(1u, active_layer_->tilings()->num_tilings());
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(1u, active_layer()->tilings()->num_tilings());
 
-  host_impl_.PinchGestureEnd();
+  host_impl()->PinchGestureEnd();
 
   // Create a 1.2 scale tiling. Now we have 1.0 and 1.2 tilings. Ideal = 1.2.
   scale /= 4.f;
   page_scale /= 4.f;
   SetContentsScaleOnBothLayers(1.2f, device_scale, page_scale, 1.f, 0.f, false);
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  ASSERT_EQ(2u, active_layer()->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(1.f,
-                  active_layer_->tilings()->tiling_at(1)->contents_scale());
+                  active_layer()->tilings()->tiling_at(1)->contents_scale());
 
   // Ensure UpdateTiles won't remove any tilings.
-  active_layer_->MarkAllTilingsUsed();
+  active_layer()->MarkAllTilingsUsed();
 
   // Mark the non-ideal tilings as used. They won't be removed.
   used_tilings.clear();
-  used_tilings.push_back(active_layer_->tilings()->tiling_at(1));
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  used_tilings.push_back(active_layer()->tilings()->tiling_at(1));
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(2u, active_layer()->tilings()->num_tilings());
 
   // Now move the ideal scale to 0.5. Our target stays 1.2.
   SetContentsScaleOnBothLayers(0.5f, device_scale, page_scale, 1.f, 0.f, false);
 
   // The high resolution tiling is between target and ideal, so is not
   // removed.  The low res tiling for the old ideal=1.0 scale is removed.
   used_tilings.clear();
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(2u, active_layer()->tilings()->num_tilings());
 
   // Now move the ideal scale to 1.0. Our target stays 1.2.
   SetContentsScaleOnBothLayers(1.f, device_scale, page_scale, 1.f, 0.f, false);
 
   // All the tilings are between are target and the ideal, so they are not
   // removed.
   used_tilings.clear();
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(2u, active_layer()->tilings()->num_tilings());
 
   // Now move the ideal scale to 1.1 on the active layer. Our target stays 1.2.
-  SetupDrawPropertiesAndUpdateTiles(active_layer_, 1.1f, device_scale,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(), 1.1f, device_scale,
                                     page_scale, 1.f, 0.f, false);
 
   // Because the pending layer's ideal scale is still 1.0, our tilings fall
   // in the range [1.0,1.2] and are kept.
   used_tilings.clear();
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(2u, active_layer()->tilings()->num_tilings());
 
   // Move the ideal scale on the pending layer to 1.1 as well. Our target stays
   // 1.2 still.
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.1f, device_scale,
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(), 1.1f, device_scale,
                                     page_scale, 1.f, 0.f, false);
 
   // Our 1.0 tiling now falls outside the range between our ideal scale and our
   // target raster scale. But it is in our used tilings set, so nothing is
   // deleted.
   used_tilings.clear();
-  used_tilings.push_back(active_layer_->tilings()->tiling_at(1));
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  used_tilings.push_back(active_layer()->tilings()->tiling_at(1));
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(2u, active_layer()->tilings()->num_tilings());
 
   // If we remove it from our used tilings set, it is outside the range to keep
   // so it is deleted.
   used_tilings.clear();
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(1u, active_layer_->tilings()->num_tilings());
+  active_layer()->CleanUpTilingsOnActiveLayer(used_tilings);
+  ASSERT_EQ(1u, active_layer()->tilings()->num_tilings());
 }
 
 TEST_F(NoLowResPictureLayerImplTest, ReleaseResources) {
   gfx::Size layer_bounds(1300, 1900);
   SetupDefaultTrees(layer_bounds);
-  EXPECT_EQ(1u, pending_layer_->tilings()->num_tilings());
-  EXPECT_EQ(1u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(1u, pending_layer()->tilings()->num_tilings());
+  EXPECT_EQ(1u, active_layer()->tilings()->num_tilings());
 
   // All tilings should be removed when losing output surface.
-  active_layer_->ReleaseResources();
-  EXPECT_FALSE(active_layer_->tilings());
-  active_layer_->RecreateResources();
-  EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
-  pending_layer_->ReleaseResources();
-  EXPECT_FALSE(pending_layer_->tilings());
-  pending_layer_->RecreateResources();
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
+  active_layer()->ReleaseResources();
+  EXPECT_FALSE(active_layer()->tilings());
+  active_layer()->RecreateResources();
+  EXPECT_EQ(0u, active_layer()->tilings()->num_tilings());
+  pending_layer()->ReleaseResources();
+  EXPECT_FALSE(pending_layer()->tilings());
+  pending_layer()->RecreateResources();
+  EXPECT_EQ(0u, pending_layer()->tilings()->num_tilings());
 
   // This should create new tilings.
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(),
                                     1.3f,  // ideal contents scale
                                     2.7f,  // device scale
                                     3.2f,  // page scale
                                     1.f,   // maximum animation scale
                                     0.f,   // starting animation scale
                                     false);
-  EXPECT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  EXPECT_EQ(1u, pending_layer()->tilings()->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, SharedQuadStateContainsMaxTilingScale) {
   std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
 
   gfx::Size layer_bounds(1000, 2000);
-  host_impl_.SetViewportSize(gfx::Size(10000, 20000));
+  host_impl()->SetViewportSize(gfx::Size(10000, 20000));
   SetupDefaultTrees(layer_bounds);
 
   ResetTilingsAndRasterScales();
-  SetupDrawPropertiesAndUpdateTiles(active_layer_, 2.5f, 1.f, 1.f, 1.f, 0.f,
+  SetupDrawPropertiesAndUpdateTiles(active_layer(), 2.5f, 1.f, 1.f, 1.f, 0.f,
                                     false);
 
-  float max_contents_scale = active_layer_->MaximumTilingContentsScale();
+  float max_contents_scale = active_layer()->MaximumTilingContentsScale();
   EXPECT_EQ(2.5f, max_contents_scale);
 
-  gfx::Transform scaled_draw_transform = active_layer_->DrawTransform();
+  gfx::Transform scaled_draw_transform = active_layer()->DrawTransform();
   scaled_draw_transform.Scale(SK_MScalar1 / max_contents_scale,
                               SK_MScalar1 / max_contents_scale);
 
   AppendQuadsData data;
-  active_layer_->AppendQuads(render_pass.get(), &data);
+  active_layer()->AppendQuads(render_pass.get(), &data);
 
   // SharedQuadState should have be of size 1, as we are doing AppenQuad once.
   EXPECT_EQ(1u, render_pass->shared_quad_state_list.size());
   // The quad_to_target_transform should be scaled by the
   // MaximumTilingContentsScale on the layer.
   EXPECT_EQ(scaled_draw_transform.ToString(),
             render_pass->shared_quad_state_list.front()
                 ->quad_to_target_transform.ToString());
   // The content_bounds should be scaled by the
   // MaximumTilingContentsScale on the layer.
   EXPECT_EQ(gfx::Size(2500u, 5000u).ToString(),
             render_pass->shared_quad_state_list.front()
                 ->quad_layer_bounds.ToString());
   // The visible_layer_rect should be scaled by the
   // MaximumTilingContentsScale on the layer.
   EXPECT_EQ(gfx::Rect(0u, 0u, 2500u, 5000u).ToString(),
             render_pass->shared_quad_state_list.front()
                 ->visible_quad_layer_rect.ToString());
 }
 
 class PictureLayerImplTestWithDelegatingRenderer : public PictureLayerImplTest {
  public:
-  PictureLayerImplTestWithDelegatingRenderer() : PictureLayerImplTest() {
-    output_surface_ = FakeOutputSurface::CreateDelegating3d();
-  }
-
-  void InitializeRenderer() override {
-    host_impl_.SetVisible(true);
-    host_impl_.InitializeRenderer(output_surface_.get());
+  std::unique_ptr<OutputSurface> CreateOutputSurface() override {
+    return FakeOutputSurface::CreateDelegating3d();
   }
 };
 
 TEST_F(PictureLayerImplTestWithDelegatingRenderer,
        DelegatingRendererWithTileOOM) {
   // This test is added for crbug.com/402321, where quad should be produced when
   // raster on demand is not allowed and tile is OOM.
   gfx::Size layer_bounds(1000, 1000);
 
   // Create tiles.
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupPendingTree(pending_raster_source);
-  pending_layer_->SetBounds(layer_bounds);
+  pending_layer()->SetBounds(layer_bounds);
   ActivateTree();
   bool update_lcd_text = false;
-  host_impl_.active_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->active_tree()->UpdateDrawProperties(update_lcd_text);
   std::vector<Tile*> tiles =
-      active_layer_->HighResTiling()->AllTilesForTesting();
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(tiles);
+      active_layer()->HighResTiling()->AllTilesForTesting();
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(tiles);
 
   // Force tiles after max_tiles to be OOM. TileManager uses
   // GlobalStateThatImpactsTilesPriority from LayerTreeHostImpl, and we cannot
   // directly set state to host_impl_, so we set policy that would change the
   // state. We also need to update tree priority separately.
   GlobalStateThatImpactsTilePriority state;
   size_t max_tiles = 1;
-  gfx::Size tile_size(host_impl_.settings().default_tile_size);
+  gfx::Size tile_size(host_impl()->settings().default_tile_size);
   size_t memory_limit = max_tiles * 4 * tile_size.width() * tile_size.height();
   size_t resource_limit = max_tiles;
   ManagedMemoryPolicy policy(memory_limit,
                              gpu::MemoryAllocation::CUTOFF_ALLOW_EVERYTHING,
                              resource_limit);
-  host_impl_.SetMemoryPolicy(policy);
-  host_impl_.SetTreePriority(SAME_PRIORITY_FOR_BOTH_TREES);
-  host_impl_.PrepareTiles();
+  host_impl()->SetMemoryPolicy(policy);
+  host_impl()->SetTreePriority(SAME_PRIORITY_FOR_BOTH_TREES);
+  host_impl()->PrepareTiles();
 
   std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
-  active_layer_->WillDraw(DRAW_MODE_HARDWARE, nullptr);
-  active_layer_->AppendQuads(render_pass.get(), &data);
-  active_layer_->DidDraw(nullptr);
+  active_layer()->WillDraw(DRAW_MODE_HARDWARE, nullptr);
+  active_layer()->AppendQuads(render_pass.get(), &data);
+  active_layer()->DidDraw(nullptr);
 
   // Even when OOM, quads should be produced, and should be different material
   // from quads with resource.
   EXPECT_LT(max_tiles, render_pass->quad_list.size());
   EXPECT_EQ(DrawQuad::Material::TILED_CONTENT,
             render_pass->quad_list.front()->material);
   EXPECT_EQ(DrawQuad::Material::SOLID_COLOR,
             render_pass->quad_list.back()->material);
 }
 
-class OcclusionTrackingSettings : public LowResTilingsSettings {
- public:
-  OcclusionTrackingSettings() { use_occlusion_for_tile_prioritization = true; }
-};
-
 class OcclusionTrackingPictureLayerImplTest : public PictureLayerImplTest {
  public:
-  OcclusionTrackingPictureLayerImplTest()
-      : PictureLayerImplTest(OcclusionTrackingSettings()) {}
+  LayerTreeSettings CreateSettings() override {
+    LayerTreeSettings settings = PictureLayerImplTest::CreateSettings();
+    settings.use_occlusion_for_tile_prioritization = true;
+    return settings;
+  }
 
   void VerifyEvictionConsidersOcclusion(FakePictureLayerImpl* layer,
                                         WhichTree tree,
                                         size_t expected_occluded_tile_count,
                                         int source_line) {
     size_t occluded_tile_count = 0u;
     PrioritizedTile last_tile;
 
     std::unique_ptr<TilingSetEvictionQueue> queue(
         new TilingSetEvictionQueue(layer->picture_layer_tiling_set()));
@@ skipping 27 matching lines @@
       last_tile = prioritized_tile;
       queue->Pop();
     }
     EXPECT_EQ(expected_occluded_tile_count, occluded_tile_count)
         << "line: " << source_line;
   }
 };
 
 TEST_F(OcclusionTrackingPictureLayerImplTest,
        OccludedTilesSkippedDuringRasterization) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(102, 102);
   gfx::Size layer_bounds(1000, 1000);
   gfx::Size viewport_size(500, 500);
   gfx::PointF occluding_layer_position(310.f, 0.f);
 
-  host_impl_.SetViewportSize(viewport_size);
+  host_impl()->SetViewportSize(viewport_size);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size, Region());
 
   // No occlusion.
   int unoccluded_tile_count = 0;
   std::unique_ptr<TilingSetRasterQueueAll> queue(new TilingSetRasterQueueAll(
-      pending_layer_->picture_layer_tiling_set(), false));
+      pending_layer()->picture_layer_tiling_set(), false));
   while (!queue->IsEmpty()) {
     PrioritizedTile prioritized_tile = queue->Top();
     Tile* tile = prioritized_tile.tile();
 
     // Occluded tiles should not be iterated over.
     EXPECT_FALSE(prioritized_tile.is_occluded());
 
     // Some tiles may not be visible (i.e. outside the viewport). The rest are
     // visible and at least partially unoccluded, verified by the above expect.
     bool tile_is_visible =
-        tile->content_rect().Intersects(pending_layer_->visible_layer_rect());
+        tile->content_rect().Intersects(pending_layer()->visible_layer_rect());
     if (tile_is_visible)
       unoccluded_tile_count++;
     queue->Pop();
   }
   EXPECT_EQ(unoccluded_tile_count, 25);
 
   // Partial occlusion.
-  pending_layer_->AddChild(LayerImpl::Create(host_impl_.pending_tree(), 1));
-  LayerImpl* layer1 = pending_layer_->children()[0];
+  pending_layer()->AddChild(LayerImpl::Create(host_impl()->pending_tree(), 1));
+  LayerImpl* layer1 = pending_layer()->children()[0];
   layer1->SetBounds(layer_bounds);
   layer1->SetDrawsContent(true);
   layer1->SetContentsOpaque(true);
   layer1->SetPosition(occluding_layer_position);
 
   RebuildPropertyTreesOnPendingTree();
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
   bool update_lcd_text = false;
-  host_impl_.pending_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->pending_tree()->UpdateDrawProperties(update_lcd_text);
 
   unoccluded_tile_count = 0;
   queue.reset(new TilingSetRasterQueueAll(
-      pending_layer_->picture_layer_tiling_set(), false));
+      pending_layer()->picture_layer_tiling_set(), false));
   while (!queue->IsEmpty()) {
     PrioritizedTile prioritized_tile = queue->Top();
     Tile* tile = prioritized_tile.tile();
 
     EXPECT_FALSE(prioritized_tile.is_occluded());
 
     bool tile_is_visible =
-        tile->content_rect().Intersects(pending_layer_->visible_layer_rect());
+        tile->content_rect().Intersects(pending_layer()->visible_layer_rect());
     if (tile_is_visible)
       unoccluded_tile_count++;
     queue->Pop();
   }
   EXPECT_EQ(20, unoccluded_tile_count);
 
   // Full occlusion.
   layer1->SetPosition(gfx::PointF());
   layer1->NoteLayerPropertyChanged();
 
   RebuildPropertyTreesOnPendingTree();
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
-  host_impl_.pending_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
+  host_impl()->pending_tree()->UpdateDrawProperties(update_lcd_text);
 
   unoccluded_tile_count = 0;
   queue.reset(new TilingSetRasterQueueAll(
-      pending_layer_->picture_layer_tiling_set(), false));
+      pending_layer()->picture_layer_tiling_set(), false));
   while (!queue->IsEmpty()) {
     PrioritizedTile prioritized_tile = queue->Top();
     Tile* tile = prioritized_tile.tile();
 
     EXPECT_FALSE(prioritized_tile.is_occluded());
 
     bool tile_is_visible =
-        tile->content_rect().Intersects(pending_layer_->visible_layer_rect());
+        tile->content_rect().Intersects(pending_layer()->visible_layer_rect());
     if (tile_is_visible)
       unoccluded_tile_count++;
     queue->Pop();
   }
   EXPECT_EQ(unoccluded_tile_count, 0);
 }
 
 TEST_F(OcclusionTrackingPictureLayerImplTest,
        OccludedTilesNotMarkedAsRequired) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(102, 102);
   gfx::Size layer_bounds(1000, 1000);
   gfx::Size viewport_size(500, 500);
   gfx::PointF occluding_layer_position(310.f, 0.f);
 
-  host_impl_.SetViewportSize(viewport_size);
+  host_impl()->SetViewportSize(viewport_size);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size, Region());
 
   // No occlusion.
   int occluded_tile_count = 0;
-  for (size_t i = 0; i < pending_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* tiling = pending_layer_->tilings()->tiling_at(i);
+  for (size_t i = 0; i < pending_layer()->num_tilings(); ++i) {
+    PictureLayerTiling* tiling = pending_layer()->tilings()->tiling_at(i);
     auto prioritized_tiles =
         tiling->UpdateAndGetAllPrioritizedTilesForTesting();
 
     occluded_tile_count = 0;
     for (PictureLayerTiling::CoverageIterator iter(tiling, 1.f,
                                                    gfx::Rect(layer_bounds));
          iter; ++iter) {
       if (!*iter)
         continue;
       const Tile* tile = *iter;
 
       // Fully occluded tiles are not required for activation.
       if (prioritized_tiles[tile].is_occluded()) {
         EXPECT_FALSE(tile->required_for_activation());
         occluded_tile_count++;
       }
     }
     EXPECT_EQ(occluded_tile_count, 0);
   }
 
   // Partial occlusion.
-  pending_layer_->AddChild(LayerImpl::Create(host_impl_.pending_tree(), 1));
-  LayerImpl* layer1 = pending_layer_->children()[0];
+  pending_layer()->AddChild(LayerImpl::Create(host_impl()->pending_tree(), 1));
+  LayerImpl* layer1 = pending_layer()->children()[0];
   layer1->SetBounds(layer_bounds);
   layer1->SetDrawsContent(true);
   layer1->SetContentsOpaque(true);
   layer1->SetPosition(occluding_layer_position);
 
   RebuildPropertyTreesOnPendingTree();
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
   bool update_lcd_text = false;
-  host_impl_.pending_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->pending_tree()->UpdateDrawProperties(update_lcd_text);
 
-  for (size_t i = 0; i < pending_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* tiling = pending_layer_->tilings()->tiling_at(i);
+  for (size_t i = 0; i < pending_layer()->num_tilings(); ++i) {
+    PictureLayerTiling* tiling = pending_layer()->tilings()->tiling_at(i);
     auto prioritized_tiles =
         tiling->UpdateAndGetAllPrioritizedTilesForTesting();
 
     occluded_tile_count = 0;
     for (PictureLayerTiling::CoverageIterator iter(tiling, 1.f,
                                                    gfx::Rect(layer_bounds));
          iter; ++iter) {
       if (!*iter)
         continue;
       const Tile* tile = *iter;
@@ skipping 13 matching lines @@
       default:
         NOTREACHED();
     }
   }
 
   // Full occlusion.
   layer1->SetPosition(gfx::PointF());
   layer1->NoteLayerPropertyChanged();
 
   RebuildPropertyTreesOnPendingTree();
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
-  host_impl_.pending_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(200));
+  host_impl()->pending_tree()->UpdateDrawProperties(update_lcd_text);
 
-  for (size_t i = 0; i < pending_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* tiling = pending_layer_->tilings()->tiling_at(i);
+  for (size_t i = 0; i < pending_layer()->num_tilings(); ++i) {
+    PictureLayerTiling* tiling = pending_layer()->tilings()->tiling_at(i);
     auto prioritized_tiles =
         tiling->UpdateAndGetAllPrioritizedTilesForTesting();
 
     occluded_tile_count = 0;
     for (PictureLayerTiling::CoverageIterator iter(tiling, 1.f,
                                                    gfx::Rect(layer_bounds));
          iter; ++iter) {
       if (!*iter)
         continue;
       const Tile* tile = *iter;
@@ skipping 10 matching lines @@
       case 1:
         EXPECT_EQ(4, occluded_tile_count);
         break;
       default:
         NOTREACHED();
     }
   }
 }
 
 TEST_F(OcclusionTrackingPictureLayerImplTest, OcclusionForDifferentScales) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(102, 102);
   gfx::Size layer_bounds(1000, 1000);
   gfx::Size viewport_size(500, 500);
   gfx::PointF occluding_layer_position(310.f, 0.f);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
-  host_impl_.SetViewportSize(viewport_size);
+  host_impl()->SetViewportSize(viewport_size);
 
   SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size, Region());
-  ASSERT_TRUE(pending_layer_->CanHaveTilings());
+  ASSERT_TRUE(pending_layer()->CanHaveTilings());
 
-  pending_layer_->AddChild(LayerImpl::Create(host_impl_.pending_tree(), 1));
-  LayerImpl* layer1 = pending_layer_->children()[0];
+  pending_layer()->AddChild(LayerImpl::Create(host_impl()->pending_tree(), 1));
+  LayerImpl* layer1 = pending_layer()->children()[0];
   layer1->SetBounds(layer_bounds);
   layer1->SetDrawsContent(true);
   layer1->SetContentsOpaque(true);
   layer1->SetPosition(occluding_layer_position);
 
-  pending_layer_->tilings()->RemoveAllTilings();
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
-  pending_layer_->AddTiling(low_res_factor)->set_resolution(LOW_RESOLUTION);
-  pending_layer_->AddTiling(0.3f)->set_resolution(HIGH_RESOLUTION);
-  pending_layer_->AddTiling(0.7f)->set_resolution(HIGH_RESOLUTION);
-  pending_layer_->AddTiling(1.0f)->set_resolution(HIGH_RESOLUTION);
-  pending_layer_->AddTiling(2.0f)->set_resolution(HIGH_RESOLUTION);
+  pending_layer()->tilings()->RemoveAllTilings();
+  float low_res_factor = host_impl()->settings().low_res_contents_scale_factor;
+  pending_layer()->AddTiling(low_res_factor)->set_resolution(LOW_RESOLUTION);
+  pending_layer()->AddTiling(0.3f)->set_resolution(HIGH_RESOLUTION);
+  pending_layer()->AddTiling(0.7f)->set_resolution(HIGH_RESOLUTION);
+  pending_layer()->AddTiling(1.0f)->set_resolution(HIGH_RESOLUTION);
+  pending_layer()->AddTiling(2.0f)->set_resolution(HIGH_RESOLUTION);
 
   RebuildPropertyTreesOnPendingTree();
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
   // UpdateDrawProperties with the occluding layer.
   bool update_lcd_text = false;
-  host_impl_.pending_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->pending_tree()->UpdateDrawProperties(update_lcd_text);
 
-  EXPECT_EQ(5u, pending_layer_->num_tilings());
+  EXPECT_EQ(5u, pending_layer()->num_tilings());
 
   int occluded_tile_count = 0;
-  for (size_t i = 0; i < pending_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* tiling = pending_layer_->tilings()->tiling_at(i);
+  for (size_t i = 0; i < pending_layer()->num_tilings(); ++i) {
+    PictureLayerTiling* tiling = pending_layer()->tilings()->tiling_at(i);
     auto prioritized_tiles =
         tiling->UpdateAndGetAllPrioritizedTilesForTesting();
     std::vector<Tile*> tiles = tiling->AllTilesForTesting();
 
     occluded_tile_count = 0;
     for (size_t j = 0; j < tiles.size(); ++j) {
       if (prioritized_tiles[tiles[j]].is_occluded()) {
         gfx::Rect scaled_content_rect = ScaleToEnclosingRect(
             tiles[j]->content_rect(), 1.0f / tiles[j]->contents_scale());
         EXPECT_GE(scaled_content_rect.x(), occluding_layer_position.x());
@@ skipping 25 matching lines @@
   gfx::Size layer_bounds(1000, 1000);
   gfx::Size viewport_size(1000, 1000);
   gfx::PointF occluding_layer_position(310.f, 0.f);
   gfx::Rect invalidation_rect(230, 230, 102, 102);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
-  host_impl_.SetViewportSize(viewport_size);
+  host_impl()->SetViewportSize(viewport_size);
   SetupPendingTree(active_raster_source);
 
   // Partially occlude the active layer.
-  pending_layer_->AddChild(LayerImpl::Create(host_impl_.pending_tree(), 2));
-  LayerImpl* layer1 = pending_layer_->children()[0];
+  pending_layer()->AddChild(LayerImpl::Create(host_impl()->pending_tree(), 2));
+  LayerImpl* layer1 = pending_layer()->children()[0];
   layer1->SetBounds(layer_bounds);
   layer1->SetDrawsContent(true);
   layer1->SetContentsOpaque(true);
   layer1->SetPosition(occluding_layer_position);
 
   ActivateTree();
 
-  for (size_t i = 0; i < active_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* tiling = active_layer_->tilings()->tiling_at(i);
+  for (size_t i = 0; i < active_layer()->num_tilings(); ++i) {
+    PictureLayerTiling* tiling = active_layer()->tilings()->tiling_at(i);
     auto prioritized_tiles =
         tiling->UpdateAndGetAllPrioritizedTilesForTesting();
 
     for (PictureLayerTiling::CoverageIterator iter(tiling, 1.f,
                                                    gfx::Rect(layer_bounds));
          iter; ++iter) {
       if (!*iter)
         continue;
       const Tile* tile = *iter;
 
       gfx::Rect scaled_content_rect = ScaleToEnclosingRect(
           tile->content_rect(), 1.0f / tile->contents_scale());
       // Tiles are occluded on the active tree iff they lie beneath the
       // occluding layer.
       EXPECT_EQ(prioritized_tiles[tile].is_occluded(),
                 scaled_content_rect.x() >= occluding_layer_position.x());
     }
   }
 
   // Partially invalidate the pending layer.
   SetupPendingTreeWithInvalidation(pending_raster_source, invalidation_rect);
 
-  for (size_t i = 0; i < active_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* tiling = active_layer_->tilings()->tiling_at(i);
+  for (size_t i = 0; i < active_layer()->num_tilings(); ++i) {
+    PictureLayerTiling* tiling = active_layer()->tilings()->tiling_at(i);
     auto prioritized_tiles =
         tiling->UpdateAndGetAllPrioritizedTilesForTesting();
 
     for (PictureLayerTiling::CoverageIterator iter(tiling, 1.f,
                                                    gfx::Rect(layer_bounds));
          iter; ++iter) {
       if (!*iter)
         continue;
       const Tile* tile = *iter;
       EXPECT_TRUE(tile);
 
       // All tiles are unoccluded, because the pending tree has no occlusion.
       EXPECT_FALSE(prioritized_tiles[tile].is_occluded());
 
       if (tiling->resolution() == LOW_RESOLUTION) {
-        EXPECT_FALSE(active_layer_->GetPendingOrActiveTwinTiling(tiling));
+        EXPECT_FALSE(active_layer()->GetPendingOrActiveTwinTiling(tiling));
         continue;
       }
 
-      Tile* twin_tile = active_layer_->GetPendingOrActiveTwinTiling(tiling)
-                            ->TileAt(iter.i(), iter.j());
+      Tile* twin_tile =
+          active_layer()->GetPendingOrActiveTwinTiling(tiling)->TileAt(
+              iter.i(), iter.j());
       gfx::Rect scaled_content_rect = ScaleToEnclosingRect(
           tile->content_rect(), 1.0f / tile->contents_scale());
 
       if (scaled_content_rect.Intersects(invalidation_rect)) {
         // Tiles inside the invalidation rect exist on both trees.
         EXPECT_TRUE(twin_tile);
         EXPECT_NE(tile, twin_tile);
       } else {
         // Tiles outside the invalidation rect only exist on the active tree.
         EXPECT_FALSE(twin_tile);
       }
     }
   }
 }
 
 TEST_F(OcclusionTrackingPictureLayerImplTest,
        OccludedTilesConsideredDuringEviction) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(102, 102);
   gfx::Size layer_bounds(1000, 1000);
   gfx::Size viewport_size(1000, 1000);
   gfx::PointF pending_occluding_layer_position(310.f, 0.f);
   gfx::PointF active_occluding_layer_position(0.f, 310.f);
   gfx::Rect invalidation_rect(230, 230, 152, 152);
 
-  host_impl_.SetViewportSize(viewport_size);
+  host_impl()->SetViewportSize(viewport_size);
   SetInitialDeviceScaleFactor(2.f);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   SetupPendingTreeWithFixedTileSize(active_raster_source, tile_size, Region());
 
   // Partially occlude the active layer.
-  pending_layer_->AddChild(LayerImpl::Create(host_impl_.pending_tree(), 2));
-  LayerImpl* active_occluding_layer = pending_layer_->children()[0];
+  pending_layer()->AddChild(LayerImpl::Create(host_impl()->pending_tree(), 2));
+  LayerImpl* active_occluding_layer = pending_layer()->children()[0];
   active_occluding_layer->SetBounds(layer_bounds);
   active_occluding_layer->SetDrawsContent(true);
   active_occluding_layer->SetContentsOpaque(true);
   active_occluding_layer->SetPosition(active_occluding_layer_position);
 
   ActivateTree();
 
   // Partially invalidate the pending layer. Tiles inside the invalidation rect
   // are created.
   SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size,
                                     invalidation_rect);
 
   // Partially occlude the pending layer in a different way.
-  pending_layer_->AddChild(LayerImpl::Create(host_impl_.pending_tree(), 3));
-  LayerImpl* pending_occluding_layer = pending_layer_->children()[0];
+  pending_layer()->AddChild(LayerImpl::Create(host_impl()->pending_tree(), 3));
+  LayerImpl* pending_occluding_layer = pending_layer()->children()[0];
   pending_occluding_layer->SetBounds(layer_bounds);
   pending_occluding_layer->SetDrawsContent(true);
   pending_occluding_layer->SetContentsOpaque(true);
   pending_occluding_layer->SetPosition(pending_occluding_layer_position);
 
-  EXPECT_EQ(1u, pending_layer_->num_tilings());
-  EXPECT_EQ(2u, active_layer_->num_tilings());
+  EXPECT_EQ(1u, pending_layer()->num_tilings());
+  EXPECT_EQ(2u, active_layer()->num_tilings());
 
   RebuildPropertyTreesOnPendingTree();
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
   // UpdateDrawProperties with the occluding layer.
   bool update_lcd_text = false;
-  host_impl_.pending_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->pending_tree()->UpdateDrawProperties(update_lcd_text);
 
   // The expected number of occluded tiles on each of the 2 tilings for each of
   // the 3 tree priorities.
   size_t expected_occluded_tile_count_on_pending[] = {4u, 0u};
   size_t expected_occluded_tile_count_on_active[] = {12u, 3u};
   size_t total_expected_occluded_tile_count_on_trees[] = {15u, 4u};
 
   // Verify number of occluded tiles on the pending layer for each tiling.
-  for (size_t i = 0; i < pending_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* tiling = pending_layer_->tilings()->tiling_at(i);
+  for (size_t i = 0; i < pending_layer()->num_tilings(); ++i) {
+    PictureLayerTiling* tiling = pending_layer()->tilings()->tiling_at(i);
     auto prioritized_tiles =
         tiling->UpdateAndGetAllPrioritizedTilesForTesting();
 
     size_t occluded_tile_count_on_pending = 0u;
     for (PictureLayerTiling::CoverageIterator iter(tiling, 1.f,
                                                    gfx::Rect(layer_bounds));
          iter; ++iter) {
       Tile* tile = *iter;
 
       if (invalidation_rect.Intersects(iter.geometry_rect()))
         EXPECT_TRUE(tile);
       else
         EXPECT_FALSE(tile);
 
       if (!tile)
         continue;
       if (prioritized_tiles[tile].is_occluded())
         occluded_tile_count_on_pending++;
     }
     EXPECT_EQ(expected_occluded_tile_count_on_pending[i],
               occluded_tile_count_on_pending)
         << tiling->contents_scale();
   }
 
   // Verify number of occluded tiles on the active layer for each tiling.
-  for (size_t i = 0; i < active_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* tiling = active_layer_->tilings()->tiling_at(i);
+  for (size_t i = 0; i < active_layer()->num_tilings(); ++i) {
+    PictureLayerTiling* tiling = active_layer()->tilings()->tiling_at(i);
     auto prioritized_tiles =
         tiling->UpdateAndGetAllPrioritizedTilesForTesting();
 
     size_t occluded_tile_count_on_active = 0u;
     for (PictureLayerTiling::CoverageIterator iter(tiling, 1.f,
                                                    gfx::Rect(layer_bounds));
          iter; ++iter) {
       Tile* tile = *iter;
 
       if (!tile)
         continue;
       if (prioritized_tiles[tile].is_occluded())
         occluded_tile_count_on_active++;
     }
     EXPECT_EQ(expected_occluded_tile_count_on_active[i],
               occluded_tile_count_on_active)
         << i;
   }
 
   std::vector<Tile*> all_tiles;
-  for (size_t i = 0; i < pending_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* tiling = pending_layer_->tilings()->tiling_at(i);
+  for (size_t i = 0; i < pending_layer()->num_tilings(); ++i) {
+    PictureLayerTiling* tiling = pending_layer()->tilings()->tiling_at(i);
     std::vector<Tile*> tiles = tiling->AllTilesForTesting();
     all_tiles.insert(all_tiles.end(), tiles.begin(), tiles.end());
   }
-  for (size_t i = 0; i < active_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* tiling = active_layer_->tilings()->tiling_at(i);
+  for (size_t i = 0; i < active_layer()->num_tilings(); ++i) {
+    PictureLayerTiling* tiling = active_layer()->tilings()->tiling_at(i);
     std::vector<Tile*> tiles = tiling->AllTilesForTesting();
     all_tiles.insert(all_tiles.end(), tiles.begin(), tiles.end());
   }
 
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(all_tiles);
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(
+      all_tiles);
 
   VerifyEvictionConsidersOcclusion(
-      pending_layer_, PENDING_TREE,
+      pending_layer(), PENDING_TREE,
       total_expected_occluded_tile_count_on_trees[PENDING_TREE], __LINE__);
   VerifyEvictionConsidersOcclusion(
-      active_layer_, ACTIVE_TREE,
+      active_layer(), ACTIVE_TREE,
       total_expected_occluded_tile_count_on_trees[ACTIVE_TREE], __LINE__);
 
   // Repeat the tests without valid active tree priorities.
-  active_layer_->set_has_valid_tile_priorities(false);
+  active_layer()->set_has_valid_tile_priorities(false);
   VerifyEvictionConsidersOcclusion(
-      pending_layer_, PENDING_TREE,
+      pending_layer(), PENDING_TREE,
       total_expected_occluded_tile_count_on_trees[PENDING_TREE], __LINE__);
   VerifyEvictionConsidersOcclusion(
-      active_layer_, ACTIVE_TREE,
+      active_layer(), ACTIVE_TREE,
       total_expected_occluded_tile_count_on_trees[ACTIVE_TREE], __LINE__);
-  active_layer_->set_has_valid_tile_priorities(true);
+  active_layer()->set_has_valid_tile_priorities(true);
 
   // Repeat the tests without valid pending tree priorities.
-  pending_layer_->set_has_valid_tile_priorities(false);
+  pending_layer()->set_has_valid_tile_priorities(false);
   VerifyEvictionConsidersOcclusion(
-      active_layer_, ACTIVE_TREE,
+      active_layer(), ACTIVE_TREE,
       total_expected_occluded_tile_count_on_trees[ACTIVE_TREE], __LINE__);
   VerifyEvictionConsidersOcclusion(
-      pending_layer_, PENDING_TREE,
+      pending_layer(), PENDING_TREE,
       total_expected_occluded_tile_count_on_trees[PENDING_TREE], __LINE__);
-  pending_layer_->set_has_valid_tile_priorities(true);
+  pending_layer()->set_has_valid_tile_priorities(true);
 }
 
 TEST_F(PictureLayerImplTest, PendingOrActiveTwinLayer) {
   gfx::Size layer_bounds(1000, 1000);
 
   scoped_refptr<FakeRasterSource> raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupPendingTree(raster_source);
-  EXPECT_FALSE(pending_layer_->GetPendingOrActiveTwinLayer());
+  EXPECT_FALSE(pending_layer()->GetPendingOrActiveTwinLayer());
 
   ActivateTree();
-  EXPECT_FALSE(active_layer_->GetPendingOrActiveTwinLayer());
+  EXPECT_FALSE(active_layer()->GetPendingOrActiveTwinLayer());
 
   SetupPendingTree(raster_source);
-  EXPECT_TRUE(pending_layer_->GetPendingOrActiveTwinLayer());
-  EXPECT_TRUE(active_layer_->GetPendingOrActiveTwinLayer());
-  EXPECT_EQ(pending_layer_, active_layer_->GetPendingOrActiveTwinLayer());
-  EXPECT_EQ(active_layer_, pending_layer_->GetPendingOrActiveTwinLayer());
+  EXPECT_TRUE(pending_layer()->GetPendingOrActiveTwinLayer());
+  EXPECT_TRUE(active_layer()->GetPendingOrActiveTwinLayer());
+  EXPECT_EQ(pending_layer(), active_layer()->GetPendingOrActiveTwinLayer());
+  EXPECT_EQ(active_layer(), pending_layer()->GetPendingOrActiveTwinLayer());
 
   ActivateTree();
-  EXPECT_FALSE(active_layer_->GetPendingOrActiveTwinLayer());
+  EXPECT_FALSE(active_layer()->GetPendingOrActiveTwinLayer());
 
   // Make an empty pending tree.
-  host_impl_.CreatePendingTree();
-  host_impl_.pending_tree()->ClearLayers();
-  EXPECT_FALSE(active_layer_->GetPendingOrActiveTwinLayer());
+  host_impl()->CreatePendingTree();
+  host_impl()->pending_tree()->ClearLayers();
+  EXPECT_FALSE(active_layer()->GetPendingOrActiveTwinLayer());
 }
 
 void PictureLayerImplTest::TestQuadsForSolidColor(bool test_for_solid) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(200, 200);
   gfx::Rect layer_rect(layer_bounds);
 
   FakeContentLayerClient client;
   client.set_bounds(layer_bounds);
   scoped_refptr<PictureLayer> layer = PictureLayer::Create(&client);
   FakeLayerTreeHostClient host_client(FakeLayerTreeHostClient::DIRECT_3D);
   TestTaskGraphRunner task_graph_runner;
@@ skipping 11 matching lines @@
       &client, &invalidation, layer_bounds, frame_number++,
       RecordingSource::RECORD_NORMALLY);
 
   scoped_refptr<RasterSource> pending_raster_source =
       recording_source->CreateRasterSource(true);
 
   SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size, Region());
   ActivateTree();
 
   if (test_for_solid) {
-    EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
+    EXPECT_EQ(0u, active_layer()->tilings()->num_tilings());
   } else {
-    ASSERT_TRUE(active_layer_->tilings());
-    ASSERT_GT(active_layer_->tilings()->num_tilings(), 0u);
+    ASSERT_TRUE(active_layer()->tilings());
+    ASSERT_GT(active_layer()->tilings()->num_tilings(), 0u);
     std::vector<Tile*> tiles =
-        active_layer_->tilings()->tiling_at(0)->AllTilesForTesting();
+        active_layer()->tilings()->tiling_at(0)->AllTilesForTesting();
     EXPECT_FALSE(tiles.empty());
-    host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(tiles);
+    host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(tiles);
   }
 
   std::unique_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
-  active_layer_->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
-  active_layer_->AppendQuads(render_pass.get(), &data);
-  active_layer_->DidDraw(nullptr);
+  active_layer()->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
+  active_layer()->AppendQuads(render_pass.get(), &data);
+  active_layer()->DidDraw(nullptr);
 
   DrawQuad::Material expected = test_for_solid
                                     ? DrawQuad::Material::SOLID_COLOR
                                     : DrawQuad::Material::TILED_CONTENT;
   EXPECT_EQ(expected, render_pass->quad_list.front()->material);
 }
 
 TEST_F(PictureLayerImplTest, DrawSolidQuads) {
   TestQuadsForSolidColor(true);
 }
 
 TEST_F(PictureLayerImplTest, DrawNonSolidQuads) {
   TestQuadsForSolidColor(false);
 }
 
 TEST_F(PictureLayerImplTest, NonSolidToSolidNoTilings) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(200, 200);
   gfx::Rect layer_rect(layer_bounds);
 
   FakeContentLayerClient client;
   client.set_bounds(layer_bounds);
   scoped_refptr<PictureLayer> layer = PictureLayer::Create(&client);
   FakeLayerTreeHostClient host_client(FakeLayerTreeHostClient::DIRECT_3D);
   TestTaskGraphRunner task_graph_runner;
@@ skipping 11 matching lines @@
   recording_source->UpdateAndExpandInvalidation(
       &client, &invalidation1, layer_bounds, frame_number++,
       RecordingSource::RECORD_NORMALLY);
 
   scoped_refptr<RasterSource> raster_source1 =
       recording_source->CreateRasterSource(true);
 
   SetupPendingTree(raster_source1);
   ActivateTree();
   bool update_lcd_text = false;
-  host_impl_.active_tree()->UpdateDrawProperties(update_lcd_text);
+  host_impl()->active_tree()->UpdateDrawProperties(update_lcd_text);
 
   // We've started with a solid layer that contains some tilings.
-  ASSERT_TRUE(active_layer_->tilings());
-  EXPECT_NE(0u, active_layer_->tilings()->num_tilings());
+  ASSERT_TRUE(active_layer()->tilings());
+  EXPECT_NE(0u, active_layer()->tilings()->num_tilings());
 
   client.set_fill_with_nonsolid_color(false);
 
   recording_source->SetNeedsDisplayRect(layer_rect);
   Region invalidation2;
   recording_source->UpdateAndExpandInvalidation(
       &client, &invalidation2, layer_bounds, frame_number++,
       RecordingSource::RECORD_NORMALLY);
 
   scoped_refptr<RasterSource> raster_source2 =
       recording_source->CreateRasterSource(true);
 
   SetupPendingTree(raster_source2);
   ActivateTree();
 
   // We've switched to a solid color, so we should end up with no tilings.
-  ASSERT_TRUE(active_layer_->tilings());
-  EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
+  ASSERT_TRUE(active_layer()->tilings());
+  EXPECT_EQ(0u, active_layer()->tilings()->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, ChangeInViewportAllowsTilingUpdates) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size layer_bounds(400, 4000);
   SetupDefaultTrees(layer_bounds);
 
   Region invalidation;
   gfx::Rect viewport = gfx::Rect(0, 0, 100, 100);
   gfx::Transform transform;
 
-  host_impl_.SetRequiresHighResToDraw();
+  host_impl()->SetRequiresHighResToDraw();
 
   // Update tiles.
-  pending_layer_->draw_properties().visible_layer_rect = viewport;
-  pending_layer_->draw_properties().screen_space_transform = transform;
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.f, 1.f, 1.f, 1.f, 0.f,
+  pending_layer()->draw_properties().visible_layer_rect = viewport;
+  pending_layer()->draw_properties().screen_space_transform = transform;
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(), 1.f, 1.f, 1.f, 1.f, 0.f,
                                     false);
-  pending_layer_->HighResTiling()->UpdateAllRequiredStateForTesting();
+  pending_layer()->HighResTiling()->UpdateAllRequiredStateForTesting();
 
   // Ensure we can't activate.
-  EXPECT_FALSE(host_impl_.tile_manager()->IsReadyToActivate());
+  EXPECT_FALSE(host_impl()->tile_manager()->IsReadyToActivate());
 
   // Now in the same frame, move the viewport (this can happen during
   // animation).
   viewport = gfx::Rect(0, 2000, 100, 100);
 
   // Update tiles.
-  pending_layer_->draw_properties().visible_layer_rect = viewport;
-  pending_layer_->draw_properties().screen_space_transform = transform;
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.f, 1.f, 1.f, 1.f, 0.f,
+  pending_layer()->draw_properties().visible_layer_rect = viewport;
+  pending_layer()->draw_properties().screen_space_transform = transform;
+  SetupDrawPropertiesAndUpdateTiles(pending_layer(), 1.f, 1.f, 1.f, 1.f, 0.f,
                                     false);
-  pending_layer_->HighResTiling()->UpdateAllRequiredStateForTesting();
+  pending_layer()->HighResTiling()->UpdateAllRequiredStateForTesting();
 
   // Make sure all viewport tiles (viewport from the tiling) are ready to draw.
   std::vector<Tile*> tiles;
   for (PictureLayerTiling::CoverageIterator iter(
-           pending_layer_->HighResTiling(),
-           1.f,
-           pending_layer_->HighResTiling()->GetCurrentVisibleRectForTesting());
-       iter;
-       ++iter) {
+           pending_layer()->HighResTiling(), 1.f,
+           pending_layer()->HighResTiling()->GetCurrentVisibleRectForTesting());
+       iter; ++iter) {
     if (*iter)
       tiles.push_back(*iter);
   }
   for (PictureLayerTiling::CoverageIterator iter(
-           active_layer_->HighResTiling(), 1.f,
-           active_layer_->HighResTiling()->GetCurrentVisibleRectForTesting());
+           active_layer()->HighResTiling(), 1.f,
+           active_layer()->HighResTiling()->GetCurrentVisibleRectForTesting());
        iter; ++iter) {
     if (*iter)
       tiles.push_back(*iter);
   }
 
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(tiles);
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(tiles);
 
   // Ensure we can activate.
-  EXPECT_TRUE(host_impl_.tile_manager()->IsReadyToActivate());
+  EXPECT_TRUE(host_impl()->tile_manager()->IsReadyToActivate());
 }
 
 TEST_F(PictureLayerImplTest, CloneMissingRecordings) {
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(400, 400);
 
   scoped_refptr<FakeRasterSource> filled_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   scoped_refptr<FakeRasterSource> partial_raster_source =
       FakeRasterSource::CreatePartiallyFilled(layer_bounds,
                                               gfx::Rect(100, 100, 300, 300));
 
   SetupPendingTreeWithFixedTileSize(filled_raster_source, tile_size, Region());
   ActivateTree();
 
-  PictureLayerTiling* pending_tiling = old_pending_layer_->HighResTiling();
-  PictureLayerTiling* active_tiling = active_layer_->HighResTiling();
+  PictureLayerTiling* pending_tiling = old_pending_layer()->HighResTiling();
+  PictureLayerTiling* active_tiling = active_layer()->HighResTiling();
 
   // We should have all tiles on active, and none on pending.
   EXPECT_EQ(0u, pending_tiling->AllTilesForTesting().size());
   EXPECT_EQ(5u * 5u, active_tiling->AllTilesForTesting().size());
 
   // Now put a partially-recorded raster source on the pending tree (and
   // invalidate everything, since the main thread recording will invalidate
   // dropped recordings). This will cause us to be missing some tiles.
   SetupPendingTreeWithFixedTileSize(partial_raster_source, tile_size,
                                     Region(gfx::Rect(layer_bounds)));
@@ skipping 26 matching lines @@
 
   // Activate the tree. The tiles are moved to the active tree.
   ActivateTree();
   EXPECT_EQ(5u * 5u, active_tiling->AllTilesForTesting().size());
   EXPECT_EQ(tile00, active_tiling->TileAt(0, 0));
   EXPECT_EQ(tile11, active_tiling->TileAt(1, 1));
   EXPECT_EQ(tile22, active_tiling->TileAt(2, 2));
 }
 
 TEST_F(PictureLayerImplTest, ScrollPastLiveTilesRectAndBack) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(102, 102);
   gfx::Size layer_bounds(100, 100);
   gfx::Size viewport_size(100, 100);
 
-  host_impl_.SetViewportSize(viewport_size);
+  host_impl()->SetViewportSize(viewport_size);
   SetInitialDeviceScaleFactor(1.f);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   scoped_refptr<FakeRasterSource> active_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
 
   SetupPendingTreeWithFixedTileSize(active_raster_source, tile_size, Region());
 
   ActivateTree();
-  EXPECT_TRUE(active_layer_->HighResTiling()->has_tiles());
+  EXPECT_TRUE(active_layer()->HighResTiling()->has_tiles());
 
-  host_impl_.SetExternalTilePriorityConstraints(gfx::Rect(0, 5000, 100, 100),
-                                                gfx::Transform());
+  host_impl()->SetExternalTilePriorityConstraints(gfx::Rect(0, 5000, 100, 100),
+                                                  gfx::Transform());
 
   SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size,
                                     gfx::Rect());
 
-  EXPECT_FALSE(pending_layer_->HighResTiling()->has_tiles());
-  EXPECT_TRUE(pending_layer_->HighResTiling()->live_tiles_rect().IsEmpty());
+  EXPECT_FALSE(pending_layer()->HighResTiling()->has_tiles());
+  EXPECT_TRUE(pending_layer()->HighResTiling()->live_tiles_rect().IsEmpty());
   ActivateTree();
-  EXPECT_FALSE(active_layer_->HighResTiling()->has_tiles());
-  EXPECT_TRUE(active_layer_->HighResTiling()->live_tiles_rect().IsEmpty());
+  EXPECT_FALSE(active_layer()->HighResTiling()->has_tiles());
+  EXPECT_TRUE(active_layer()->HighResTiling()->live_tiles_rect().IsEmpty());
 
-  host_impl_.SetExternalTilePriorityConstraints(gfx::Rect(0, 110, 100, 100),
-                                                gfx::Transform());
+  host_impl()->SetExternalTilePriorityConstraints(gfx::Rect(0, 110, 100, 100),
+                                                  gfx::Transform());
 
   SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size,
                                     gfx::Rect());
 
-  EXPECT_FALSE(pending_layer_->HighResTiling()->has_tiles());
-  EXPECT_FALSE(pending_layer_->HighResTiling()->live_tiles_rect().IsEmpty());
+  EXPECT_FALSE(pending_layer()->HighResTiling()->has_tiles());
+  EXPECT_FALSE(pending_layer()->HighResTiling()->live_tiles_rect().IsEmpty());
   ActivateTree();
-  EXPECT_TRUE(active_layer_->HighResTiling()->has_tiles());
-  EXPECT_FALSE(active_layer_->HighResTiling()->live_tiles_rect().IsEmpty());
+  EXPECT_TRUE(active_layer()->HighResTiling()->has_tiles());
+  EXPECT_FALSE(active_layer()->HighResTiling()->live_tiles_rect().IsEmpty());
 }
 
 TEST_F(PictureLayerImplTest, ScrollPropagatesToPending) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size layer_bounds(1000, 1000);
   gfx::Size viewport_size(100, 100);
 
-  host_impl_.SetViewportSize(viewport_size);
+  host_impl()->SetViewportSize(viewport_size);
   SetInitialDeviceScaleFactor(1.f);
 
   SetupDefaultTrees(layer_bounds);
 
-  active_layer_->SetCurrentScrollOffset(gfx::ScrollOffset(0.0, 50.0));
-  host_impl_.active_tree()->UpdateDrawProperties(false);
-  EXPECT_EQ("0,50 100x100", active_layer_->HighResTiling()
+  active_layer()->SetCurrentScrollOffset(gfx::ScrollOffset(0.0, 50.0));
+  host_impl()->active_tree()->UpdateDrawProperties(false);
+  EXPECT_EQ("0,50 100x100", active_layer()
+                                ->HighResTiling()
                                 ->GetCurrentVisibleRectForTesting()
                                 .ToString());
 
-  EXPECT_EQ("0,0 100x100", pending_layer_->HighResTiling()
+  EXPECT_EQ("0,0 100x100", pending_layer()
+                               ->HighResTiling()
                                ->GetCurrentVisibleRectForTesting()
                                .ToString());
-  host_impl_.pending_tree()->UpdateDrawProperties(false);
-  EXPECT_EQ("0,50 100x100", pending_layer_->HighResTiling()
+  host_impl()->pending_tree()->UpdateDrawProperties(false);
+  EXPECT_EQ("0,50 100x100", pending_layer()
+                                ->HighResTiling()
                                 ->GetCurrentVisibleRectForTesting()
                                 .ToString());
 }
 
 TEST_F(PictureLayerImplTest, UpdateLCDInvalidatesPendingTree) {
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   gfx::Size tile_size(102, 102);
   gfx::Size layer_bounds(100, 100);
   gfx::Size viewport_size(100, 100);
 
-  host_impl_.SetViewportSize(viewport_size);
+  host_impl()->SetViewportSize(viewport_size);
   SetInitialDeviceScaleFactor(1.f);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilledLCD(layer_bounds);
   SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size, Region());
 
-  EXPECT_TRUE(pending_layer_->RasterSourceUsesLCDText());
-  EXPECT_TRUE(pending_layer_->HighResTiling()->has_tiles());
+  EXPECT_TRUE(pending_layer()->RasterSourceUsesLCDText());
+  EXPECT_TRUE(pending_layer()->HighResTiling()->has_tiles());
   std::vector<Tile*> tiles =
-      pending_layer_->HighResTiling()->AllTilesForTesting();
-  auto prioritized_tiles = pending_layer_->HighResTiling()
+      pending_layer()->HighResTiling()->AllTilesForTesting();
+  auto prioritized_tiles = pending_layer()
+                               ->HighResTiling()
                                ->UpdateAndGetAllPrioritizedTilesForTesting();
 
   for (Tile* tile : tiles)
-    EXPECT_EQ(pending_layer_->raster_source(),
+    EXPECT_EQ(pending_layer()->raster_source(),
               prioritized_tiles[tile].raster_source());
 
-  pending_layer_->draw_properties().can_use_lcd_text = false;
-  pending_layer_->UpdateCanUseLCDTextAfterCommit();
+  pending_layer()->draw_properties().can_use_lcd_text = false;
+  pending_layer()->UpdateCanUseLCDTextAfterCommit();
 
-  EXPECT_FALSE(pending_layer_->RasterSourceUsesLCDText());
-  EXPECT_NE(pending_raster_source.get(), pending_layer_->raster_source());
-  EXPECT_TRUE(pending_layer_->HighResTiling()->has_tiles());
-  tiles = pending_layer_->HighResTiling()->AllTilesForTesting();
-  prioritized_tiles = pending_layer_->HighResTiling()
+  EXPECT_FALSE(pending_layer()->RasterSourceUsesLCDText());
+  EXPECT_NE(pending_raster_source.get(), pending_layer()->raster_source());
+  EXPECT_TRUE(pending_layer()->HighResTiling()->has_tiles());
+  tiles = pending_layer()->HighResTiling()->AllTilesForTesting();
+  prioritized_tiles = pending_layer()
+                          ->HighResTiling()
                           ->UpdateAndGetAllPrioritizedTilesForTesting();
   for (Tile* tile : tiles)
-    EXPECT_EQ(pending_layer_->raster_source(),
+    EXPECT_EQ(pending_layer()->raster_source(),
               prioritized_tiles[tile].raster_source());
 }
 
 TEST_F(PictureLayerImplTest, TilingAllTilesDone) {
-  gfx::Size tile_size = host_impl_.settings().default_tile_size;
+  gfx::Size tile_size = host_impl()->settings().default_tile_size;
   size_t tile_mem = 4 * tile_size.width() * tile_size.height();
   gfx::Size layer_bounds(1000, 1000);
 
   // Create tiles.
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupPendingTree(pending_raster_source);
-  pending_layer_->SetBounds(layer_bounds);
+  pending_layer()->SetBounds(layer_bounds);
   ActivateTree();
-  host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(
-      active_layer_->HighResTiling()->AllTilesForTesting());
-  host_impl_.SetTreePriority(SAME_PRIORITY_FOR_BOTH_TREES);
+  host_impl()->tile_manager()->InitializeTilesWithResourcesForTesting(
+      active_layer()->HighResTiling()->AllTilesForTesting());
+  host_impl()->SetTreePriority(SAME_PRIORITY_FOR_BOTH_TREES);
 
-  EXPECT_FALSE(active_layer_->HighResTiling()->all_tiles_done());
+  EXPECT_FALSE(active_layer()->HighResTiling()->all_tiles_done());
 
   {
     // Set a memory policy that will fit all tiles.
     size_t max_tiles = 16;
     size_t memory_limit = max_tiles * tile_mem;
     ManagedMemoryPolicy policy(memory_limit,
                                gpu::MemoryAllocation::CUTOFF_ALLOW_EVERYTHING,
                                max_tiles);
-    host_impl_.SetMemoryPolicy(policy);
-    host_impl_.PrepareTiles();
+    host_impl()->SetMemoryPolicy(policy);
+    host_impl()->PrepareTiles();
 
-    EXPECT_TRUE(active_layer_->HighResTiling()->all_tiles_done());
+    EXPECT_TRUE(active_layer()->HighResTiling()->all_tiles_done());
   }
 
   {
     // Set a memory policy that will cause tile eviction.
     size_t max_tiles = 1;
     size_t memory_limit = max_tiles * tile_mem;
     ManagedMemoryPolicy policy(memory_limit,
                                gpu::MemoryAllocation::CUTOFF_ALLOW_EVERYTHING,
                                max_tiles);
-    host_impl_.SetMemoryPolicy(policy);
-    host_impl_.PrepareTiles();
+    host_impl()->SetMemoryPolicy(policy);
+    host_impl()->PrepareTiles();
 
-    EXPECT_FALSE(active_layer_->HighResTiling()->all_tiles_done());
+    EXPECT_FALSE(active_layer()->HighResTiling()->all_tiles_done());
   }
 }
 
-class TileSizeSettings : public PictureLayerImplTestSettings {
+class TileSizeTest : public PictureLayerImplTest {
  public:
-  TileSizeSettings() {
-    default_tile_size = gfx::Size(100, 100);
-    max_untiled_layer_size = gfx::Size(200, 200);
+  LayerTreeSettings CreateSettings() override {
+    LayerTreeSettings settings = PictureLayerImplTest::CreateSettings();
+    settings.default_tile_size = gfx::Size(100, 100);
+    settings.max_untiled_layer_size = gfx::Size(200, 200);
+    return settings;
   }
 };
 
-class TileSizeTest : public PictureLayerImplTest {
- public:
-  TileSizeTest() : PictureLayerImplTest(TileSizeSettings()) {}
-};
+TEST_F(TileSizeTest, TileSizes) {
+  host_impl()->CreatePendingTree();
 
-TEST_F(TileSizeTest, TileSizes) {
-  host_impl_.CreatePendingTree();
+  LayerTreeImpl* pending_tree = host_impl()->pending_tree();
+  std::unique_ptr<FakePictureLayerImpl> layer =
+      FakePictureLayerImpl::Create(pending_tree, layer_id());
 
-  LayerTreeImpl* pending_tree = host_impl_.pending_tree();
-  std::unique_ptr<FakePictureLayerImpl> layer =
-      FakePictureLayerImpl::Create(pending_tree, id_);
-
-  host_impl_.SetViewportSize(gfx::Size(1000, 1000));
+  host_impl()->SetViewportSize(gfx::Size(1000, 1000));
   gfx::Size result;
 
-  host_impl_.SetContentIsSuitableForGpuRasterization(true);
-  host_impl_.SetHasGpuRasterizationTrigger(false);
-  EXPECT_EQ(host_impl_.gpu_rasterization_status(),
+  host_impl()->SetContentIsSuitableForGpuRasterization(true);
+  host_impl()->SetHasGpuRasterizationTrigger(false);
+  EXPECT_EQ(host_impl()->gpu_rasterization_status(),
             GpuRasterizationStatus::OFF_VIEWPORT);
 
   // Default tile-size for large layers.
   result = layer->CalculateTileSize(gfx::Size(10000, 10000));
   EXPECT_EQ(result.width(), 100);
   EXPECT_EQ(result.height(), 100);
   // Don't tile and round-up, when under max_untiled_layer_size.
   result = layer->CalculateTileSize(gfx::Size(42, 42));
   EXPECT_EQ(result.width(), 64);
   EXPECT_EQ(result.height(), 64);
   result = layer->CalculateTileSize(gfx::Size(191, 191));
   EXPECT_EQ(result.width(), 192);
   EXPECT_EQ(result.height(), 192);
   result = layer->CalculateTileSize(gfx::Size(199, 199));
   EXPECT_EQ(result.width(), 200);
   EXPECT_EQ(result.height(), 200);
 
   // Gpu-rasterization uses 25% viewport-height tiles.
   // The +2's below are for border texels.
-  host_impl_.SetHasGpuRasterizationTrigger(true);
-  EXPECT_EQ(host_impl_.gpu_rasterization_status(), GpuRasterizationStatus::ON);
-  host_impl_.SetViewportSize(gfx::Size(2000, 2000));
+  host_impl()->SetHasGpuRasterizationTrigger(true);
+  EXPECT_EQ(host_impl()->gpu_rasterization_status(),
+            GpuRasterizationStatus::ON);
+  host_impl()->SetViewportSize(gfx::Size(2000, 2000));
 
-  layer->set_gpu_raster_max_texture_size(host_impl_.device_viewport_size());
+  layer->set_gpu_raster_max_texture_size(host_impl()->device_viewport_size());
   result = layer->CalculateTileSize(gfx::Size(10000, 10000));
   EXPECT_EQ(result.width(),
             MathUtil::UncheckedRoundUp(
                 2000 + 2 * PictureLayerTiling::kBorderTexels, 4));
   EXPECT_EQ(result.height(), 504);  // 500 + 2, 4-byte aligned.
 
   // Clamp and round-up, when smaller than viewport.
   // Tile-height doubles to 50% when width shrinks to <= 50%.
-  host_impl_.SetViewportSize(gfx::Size(1000, 1000));
-  layer->set_gpu_raster_max_texture_size(host_impl_.device_viewport_size());
+  host_impl()->SetViewportSize(gfx::Size(1000, 1000));
+  layer->set_gpu_raster_max_texture_size(host_impl()->device_viewport_size());
   result = layer->CalculateTileSize(gfx::Size(447, 10000));
   EXPECT_EQ(result.width(), 448);
   EXPECT_EQ(result.height(), 504);  // 500 + 2, 4-byte aliged.
 
   // Largest layer is 50% of viewport width (rounded up), and
   // 50% of viewport in height.
   result = layer->CalculateTileSize(gfx::Size(447, 400));
   EXPECT_EQ(result.width(), 448);
   EXPECT_EQ(result.height(), 448);
   result = layer->CalculateTileSize(gfx::Size(500, 499));
   EXPECT_EQ(result.width(), 512);
   EXPECT_EQ(result.height(), 504);  // 500 + 2, 4-byte aligned.
 }
 
 TEST_F(NoLowResPictureLayerImplTest, LowResWasHighResCollision) {
   gfx::Size layer_bounds(1300, 1900);
 
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  float low_res_factor = host_impl()->settings().low_res_contents_scale_factor;
   SetupDefaultTrees(layer_bounds);
   ResetTilingsAndRasterScales();
 
   float page_scale = 2.f;
   SetContentsScaleOnBothLayers(page_scale, 1.0f, page_scale, 1.0f, 0.f, false);
   EXPECT_BOTH_EQ(num_tilings(), 1u);
   EXPECT_BOTH_EQ(tilings()->tiling_at(0)->contents_scale(), page_scale);
 
-  host_impl_.PinchGestureBegin();
+  host_impl()->PinchGestureBegin();
 
   // Zoom out to exactly the low res factor so that the previous high res
   // would be equal to the current low res (if it were possible to have one).
   float zoomed = page_scale / low_res_factor;
   SetContentsScaleOnBothLayers(zoomed, 1.0f, zoomed, 1.0f, 0.f, false);
-  EXPECT_EQ(1u, pending_layer_->num_tilings());
-  EXPECT_EQ(zoomed, pending_layer_->tilings()->tiling_at(0)->contents_scale());
+  EXPECT_EQ(1u, pending_layer()->num_tilings());
+  EXPECT_EQ(zoomed, pending_layer()->tilings()->tiling_at(0)->contents_scale());
 }
 
 TEST_F(PictureLayerImplTest, HighResWasLowResCollision) {
   gfx::Size layer_bounds(1300, 1900);
 
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  float low_res_factor = host_impl()->settings().low_res_contents_scale_factor;
 
   SetupDefaultTrees(layer_bounds);
   ResetTilingsAndRasterScales();
 
   float page_scale = 4.f;
   float low_res = page_scale * low_res_factor;
   float extra_low_res = low_res * low_res_factor;
-  SetupDrawPropertiesAndUpdateTiles(active_layer_, page_scale, 1.0f, page_scale,
-                                    1.0f, 0.f, false);
-  EXPECT_EQ(2u, active_layer_->tilings()->num_tilings());
+  SetupDrawPropertiesAndUpdateTiles(active_layer(), page_scale, 1.0f,
+                                    page_scale, 1.0f, 0.f, false);
+  EXPECT_EQ(2u, active_layer()->tilings()->num_tilings());
   EXPECT_EQ(page_scale,
-            active_layer_->tilings()->tiling_at(0)->contents_scale());
-  EXPECT_EQ(low_res, active_layer_->tilings()->tiling_at(1)->contents_scale());
+            active_layer()->tilings()->tiling_at(0)->contents_scale());
+  EXPECT_EQ(low_res, active_layer()->tilings()->tiling_at(1)->contents_scale());
 
   // Grab a current low res tile.
   PictureLayerTiling* old_low_res_tiling =
-      active_layer_->tilings()->tiling_at(1);
-  Tile* old_low_res_tile = active_layer_->tilings()->tiling_at(1)->TileAt(0, 0);
+      active_layer()->tilings()->tiling_at(1);
+  Tile* old_low_res_tile =
+      active_layer()->tilings()->tiling_at(1)->TileAt(0, 0);
 
   // The tiling knows it has low res content.
-  EXPECT_TRUE(active_layer_->tilings()
+  EXPECT_TRUE(active_layer()
+                  ->tilings()
                   ->tiling_at(1)
                   ->may_contain_low_resolution_tiles());
 
-  host_impl_.AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
+  host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
 
   // Zoom in to exactly the low res factor so that the previous low res
   // would be equal to the current high res.
-  SetupDrawPropertiesAndUpdateTiles(active_layer_, low_res, 1.0f, low_res, 1.0f,
-                                    0.f, false);
+  SetupDrawPropertiesAndUpdateTiles(active_layer(), low_res, 1.0f, low_res,
+                                    1.0f, 0.f, false);
   // 3 tilings. The old high res, the new high res (old low res) and the new low
   // res.
-  EXPECT_EQ(3u, active_layer_->num_tilings());
+  EXPECT_EQ(3u, active_layer()->num_tilings());
 
-  PictureLayerTilingSet* tilings = active_layer_->tilings();
+  PictureLayerTilingSet* tilings = active_layer()->tilings();
   EXPECT_EQ(page_scale, tilings->tiling_at(0)->contents_scale());
   EXPECT_EQ(low_res, tilings->tiling_at(1)->contents_scale());
   EXPECT_EQ(extra_low_res, tilings->tiling_at(2)->contents_scale());
 
   EXPECT_EQ(NON_IDEAL_RESOLUTION, tilings->tiling_at(0)->resolution());
   EXPECT_EQ(HIGH_RESOLUTION, tilings->tiling_at(1)->resolution());
   EXPECT_EQ(LOW_RESOLUTION, tilings->tiling_at(2)->resolution());
 
   // The old low res tile was destroyed and replaced.
   EXPECT_EQ(old_low_res_tiling, tilings->tiling_at(1));
   EXPECT_NE(old_low_res_tile, tilings->tiling_at(1)->TileAt(0, 0));
   EXPECT_TRUE(tilings->tiling_at(1)->TileAt(0, 0));
 
   // New high res tiling.
   EXPECT_FALSE(tilings->tiling_at(0)->may_contain_low_resolution_tiles());
   // New low res tiling.
   EXPECT_TRUE(tilings->tiling_at(2)->may_contain_low_resolution_tiles());
 
   // This tiling will be high res now, it won't contain low res content since it
   // was all destroyed.
   EXPECT_FALSE(tilings->tiling_at(1)->may_contain_low_resolution_tiles());
 }
 
 }  // namespace
 }  // namespace cc