cc: Don't swap PictureLayerTilingSet on activate.

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 <algorithm>
 #include <limits>
 #include <set>
 #include <utility>
@@ skipping 16 matching lines @@
 #include "cc/test/test_shared_bitmap_manager.h"
 #include "cc/test/test_web_graphics_context_3d.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);  \
+  } while (false)
+
+#define EXPECT_BOTH_NE(expression, x)         \
+  do {                                        \
+    EXPECT_NE(x, pending_layer_->expression); \
+    EXPECT_NE(x, active_layer_->expression);  \
+  } while (false)
+
 class MockCanvas : public SkCanvas {
  public:
   explicit MockCanvas(int w, int h) : SkCanvas(w, h) {}
 
   void drawRect(const SkRect& rect, const SkPaint& paint) override {
     // Capture calls before SkCanvas quickReject() kicks in.
     rects_.push_back(rect);
   }
 
   std::vector<SkRect> rects_;
 };
 
 class NoLowResTilingsSettings : public ImplSidePaintingSettings {};
 
 class LowResTilingsSettings : public ImplSidePaintingSettings {
  public:
   LowResTilingsSettings() { create_low_res_tiling = true; }
 };
 
 class PictureLayerImplTest : public testing::Test {
  public:
   PictureLayerImplTest()
       : proxy_(base::MessageLoopProxy::current()),
         host_impl_(LowResTilingsSettings(), &proxy_, &shared_bitmap_manager_),
+        root_id_(6),
         id_(7),
         pending_layer_(nullptr),
         old_pending_layer_(nullptr),
-        active_layer_(nullptr) {}
+        active_layer_(nullptr) {
+    host_impl_.SetViewportSize(gfx::Size(10000, 10000));
+  }
 
   explicit PictureLayerImplTest(const LayerTreeSettings& settings)
       : proxy_(base::MessageLoopProxy::current()),
         host_impl_(settings, &proxy_, &shared_bitmap_manager_),
-        id_(7) {}
+        root_id_(6),
+        id_(7) {
+    host_impl_.SetViewportSize(gfx::Size(10000, 10000));
+  }
 
   virtual ~PictureLayerImplTest() {
   }
 
   void SetUp() override { InitializeRenderer(); }
 
   virtual void InitializeRenderer() {
     host_impl_.InitializeRenderer(FakeOutputSurface::Create3d());
   }
 
   void SetupDefaultTrees(const gfx::Size& layer_bounds) {
     gfx::Size tile_size(100, 100);
 
     scoped_refptr<FakePicturePileImpl> pending_pile =
         FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
     scoped_refptr<FakePicturePileImpl> active_pile =
         FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
     SetupTrees(pending_pile, active_pile);
   }
 
+  void SetupDefaultTreesWithInvalidation(const gfx::Size& layer_bounds,
+                                         const Region& invalidation) {
+    gfx::Size tile_size(100, 100);
+
+    scoped_refptr<FakePicturePileImpl> pending_pile =
+        FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+    scoped_refptr<FakePicturePileImpl> active_pile =
+        FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+
+    SetupTreesWithInvalidation(pending_pile, active_pile, invalidation);
+  }
+
   void ActivateTree() {
     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_));
+
+    host_impl_.active_tree()->UpdateDrawProperties();
   }
 
   void SetupDefaultTreesWithFixedTileSize(const gfx::Size& layer_bounds,
-                                          const gfx::Size& tile_size) {
-    SetupDefaultTrees(layer_bounds);
-    pending_layer_->set_fixed_tile_size(tile_size);
-    active_layer_->set_fixed_tile_size(tile_size);
+                                          const gfx::Size& tile_size,
+                                          const Region& invalidation) {
+    gfx::Size pile_tile_size(100, 100);
+
+    scoped_refptr<FakePicturePileImpl> pending_pile =
+        FakePicturePileImpl::CreateFilledPile(pile_tile_size, layer_bounds);
+    scoped_refptr<FakePicturePileImpl> active_pile =
+        FakePicturePileImpl::CreateFilledPile(pile_tile_size, layer_bounds);
+
+    SetupTreesWithFixedTileSize(pending_pile, active_pile, tile_size,
+                                invalidation);
   }
 
   void SetupTrees(
       scoped_refptr<PicturePileImpl> pending_pile,
       scoped_refptr<PicturePileImpl> active_pile) {
     SetupPendingTree(active_pile);
     ActivateTree();
-    SetupPendingTree(pending_pile);
+    SetupPendingTreeInternal(pending_pile, gfx::Size(), Region());
   }
 
-  void CreateHighLowResAndSetAllTilesVisible() {
-    // Active layer must get updated first so pending layer can share from it.
-    active_layer_->CreateDefaultTilingsAndTiles();
-    active_layer_->SetAllTilesVisible();
-    pending_layer_->CreateDefaultTilingsAndTiles();
-    pending_layer_->SetAllTilesVisible();
+  void SetupTreesWithInvalidation(scoped_refptr<PicturePileImpl> pending_pile,
+                                  scoped_refptr<PicturePileImpl> active_pile,
+                                  const Region& pending_invalidation) {
+    SetupPendingTreeInternal(active_pile, gfx::Size(), Region());
+    ActivateTree();
+    SetupPendingTreeInternal(pending_pile, gfx::Size(), pending_invalidation);
   }
 
-  void AddDefaultTilingsWithInvalidation(const Region& invalidation) {
-    active_layer_->AddTiling(2.3f);
-    active_layer_->AddTiling(1.0f);
-    active_layer_->AddTiling(0.5f);
-    for (size_t i = 0; i < active_layer_->tilings()->num_tilings(); ++i)
-      active_layer_->tilings()->tiling_at(i)->CreateAllTilesForTesting();
-    pending_layer_->set_invalidation(invalidation);
-    for (size_t i = 0; i < pending_layer_->tilings()->num_tilings(); ++i)
-      pending_layer_->tilings()->tiling_at(i)->CreateAllTilesForTesting();
+  void SetupTreesWithFixedTileSize(scoped_refptr<PicturePileImpl> pending_pile,
+                                   scoped_refptr<PicturePileImpl> active_pile,
+                                   const gfx::Size& tile_size,
+                                   const Region& pending_invalidation) {
+    SetupPendingTreeInternal(active_pile, tile_size, Region());
+    ActivateTree();
+    SetupPendingTreeInternal(pending_pile, tile_size, pending_invalidation);
   }
 
   void SetupPendingTree(scoped_refptr<RasterSource> raster_source) {
+    SetupPendingTreeInternal(raster_source, gfx::Size(), Region());
+  }
+
+  void SetupPendingTreeWithInvalidation(
+      scoped_refptr<RasterSource> raster_source,
+      const Region& invalidation) {
+    SetupPendingTreeInternal(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, 0.25f, 100.f);
     LayerTreeImpl* pending_tree = host_impl_.pending_tree();
 
-    // Steal from the recycled tree.
-    scoped_ptr<LayerImpl> old_pending_root = pending_tree->DetachLayerTree();
-    DCHECK_IMPLIES(old_pending_root, old_pending_root->id() == id_);
-
+    // Steal from the recycled tree if possible.
+    scoped_ptr<LayerImpl> pending_root = pending_tree->DetachLayerTree();
     scoped_ptr<FakePictureLayerImpl> pending_layer;
-    if (old_pending_root) {
-      pending_layer.reset(
-          static_cast<FakePictureLayerImpl*>(old_pending_root.release()));
-      pending_layer->SetRasterSource(raster_source);
+    DCHECK_IMPLIES(pending_root, pending_root->id() == root_id_);
+    if (!pending_root) {
+      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);
     } else {
-      pending_layer = FakePictureLayerImpl::CreateWithRasterSource(
-          pending_tree, id_, raster_source);
-      pending_layer->SetDrawsContent(true);
+      pending_layer.reset(static_cast<FakePictureLayerImpl*>(
+          pending_root->RemoveChild(pending_root->children()[0]).release()));
+      if (!tile_size.IsEmpty())
+        pending_layer->set_fixed_tile_size(tile_size);
     }
     // The bounds() just mirror the pile size.
-    pending_layer->SetBounds(pending_layer->raster_source()->GetSize());
-    pending_tree->SetRootLayer(pending_layer.Pass());
+    pending_layer->SetBounds(raster_source->GetSize());
+    pending_layer->SetContentBounds(raster_source->GetSize());
+    pending_layer->SetRasterSourceOnPending(raster_source, invalidation);
+
+    pending_root->AddChild(pending_layer.Pass());
+    pending_tree->SetRootLayer(pending_root.Pass());
 
     pending_layer_ = static_cast<FakePictureLayerImpl*>(
         host_impl_.pending_tree()->LayerById(id_));
     pending_layer_->DoPostCommitInitializationIfNeeded();
+
+    // Add tilings/tiles for the layer.
+    host_impl_.pending_tree()->UpdateDrawProperties();
   }
 
   void SetupDrawPropertiesAndUpdateTiles(FakePictureLayerImpl* layer,
                                          float ideal_contents_scale,
                                          float device_scale_factor,
                                          float page_scale_factor,
                                          float maximum_animation_contents_scale,
                                          bool animating_transform_to_screen) {
     layer->draw_properties().ideal_contents_scale = ideal_contents_scale;
     layer->draw_properties().device_scale_factor = device_scale_factor;
@@ skipping 35 matching lines @@
                                       contents_scale,
                                       device_scale_factor,
                                       page_scale_factor,
                                       maximum_animation_contents_scale,
                                       animating_transform);
   }
 
   void ResetTilingsAndRasterScales() {
     pending_layer_->ReleaseResources();
     active_layer_->ReleaseResources();
+    if (pending_layer_)
+      EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
+    if (active_layer_)
+      EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
   }
 
   void AssertAllTilesRequired(PictureLayerTiling* tiling) {
     std::vector<Tile*> tiles = tiling->AllTilesForTesting();
     for (size_t i = 0; i < tiles.size(); ++i)
       EXPECT_TRUE(tiles[i]->required_for_activation()) << "i: " << i;
     EXPECT_GT(tiles.size(), 0u);
   }
 
   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);
   }
 
  protected:
-  void TestTileGridAlignmentCommon() {
-    // Layer to span 4 raster tiles in x and in y
-    ImplSidePaintingSettings settings;
-    gfx::Size layer_size(
-        settings.default_tile_size.width() * 7 / 2,
-        settings.default_tile_size.height() * 7 / 2);
-
-    scoped_refptr<FakePicturePileImpl> pending_pile =
-        FakePicturePileImpl::CreateFilledPile(layer_size, layer_size);
-    scoped_refptr<FakePicturePileImpl> active_pile =
-        FakePicturePileImpl::CreateFilledPile(layer_size, layer_size);
-
-    SetupTrees(pending_pile, active_pile);
-
-    SetupDrawPropertiesAndUpdateTiles(active_layer_, 1.f, 1.f, 1.f, 1.f, false);
-
-    // Add 1x1 rects at the centers of each tile, then re-record pile contents
-    active_layer_->tilings()->tiling_at(0)->CreateAllTilesForTesting();
-    std::vector<Tile*> tiles =
-        active_layer_->tilings()->tiling_at(0)->AllTilesForTesting();
-    EXPECT_EQ(16u, tiles.size());
-    std::vector<SkRect> rects;
-    std::vector<Tile*>::const_iterator tile_iter;
-    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_pile->add_draw_rect(rect);
-      rects.push_back(SkRect::MakeXYWH(rect.x(), rect.y(), 1, 1));
-    }
-    // Force re-record with newly injected content
-    active_pile->RemoveRecordingAt(0, 0);
-    active_pile->AddRecordingAt(0, 0);
-
-    std::vector<SkRect>::const_iterator rect_iter = rects.begin();
-    for (tile_iter = tiles.begin(); tile_iter < tiles.end(); tile_iter++) {
-      MockCanvas mock_canvas(1000, 1000);
-      active_pile->PlaybackToSharedCanvas(&mock_canvas,
-                                          (*tile_iter)->content_rect(), 1.0f);
-
-      // This test verifies that when drawing the contents of a specific tile
-      // at content scale 1.0, the playback canvas never receives content from
-      // neighboring tiles which indicates that the tile grid embedded in
-      // SkPicture is perfectly aligned with the compositor's tiles.
-      EXPECT_EQ(1u, mock_canvas.rects_.size());
-      EXPECT_EQ(*rect_iter, mock_canvas.rects_[0]);
-      rect_iter++;
-    }
-  }
-
   void TestQuadsForSolidColor(bool test_for_solid);
 
   FakeImplProxy proxy_;
   TestSharedBitmapManager shared_bitmap_manager_;
   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()) {}
+};
+
 TEST_F(PictureLayerImplTest, TileGridAlignment) {
-  host_impl_.SetDeviceScaleFactor(1.f);
-  TestTileGridAlignmentCommon();
-}
+  // Layer to span 4 raster tiles in x and in y
+  ImplSidePaintingSettings settings;
+  gfx::Size layer_size(settings.default_tile_size.width() * 7 / 2,
+                       settings.default_tile_size.height() * 7 / 2);
 
-TEST_F(PictureLayerImplTest, TileGridAlignmentHiDPI) {
-  host_impl_.SetDeviceScaleFactor(2.f);
-  TestTileGridAlignmentCommon();
+  scoped_refptr<FakePicturePileImpl> pending_pile =
+      FakePicturePileImpl::CreateFilledPile(layer_size, layer_size);
+  scoped_refptr<FakePicturePileImpl> active_pile =
+      FakePicturePileImpl::CreateFilledPile(layer_size, layer_size);
+
+  SetupTrees(pending_pile, active_pile);
+
+  // Add 1x1 rects at the centers of each tile, then re-record pile contents
+  active_layer_->tilings()->tiling_at(0)->CreateAllTilesForTesting();
+  std::vector<Tile*> tiles =
+      active_layer_->tilings()->tiling_at(0)->AllTilesForTesting();
+  EXPECT_EQ(16u, tiles.size());
+  std::vector<SkRect> rects;
+  std::vector<Tile*>::const_iterator tile_iter;
+  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_pile->add_draw_rect(rect);
+    rects.push_back(SkRect::MakeXYWH(rect.x(), rect.y(), 1, 1));
+  }
+  // Force re-raster with newly injected content
+  active_pile->RemoveRecordingAt(0, 0);
+  active_pile->AddRecordingAt(0, 0);
+
+  std::vector<SkRect>::const_iterator rect_iter = rects.begin();
+  for (tile_iter = tiles.begin(); tile_iter < tiles.end(); tile_iter++) {
+    MockCanvas mock_canvas(1000, 1000);
+    active_pile->PlaybackToSharedCanvas(&mock_canvas,
+                                        (*tile_iter)->content_rect(), 1.0f);
+
+    // This test verifies that when drawing the contents of a specific tile
+    // at content scale 1.0, the playback canvas never receives content from
+    // neighboring tiles which indicates that the tile grid embedded in
+    // SkPicture is perfectly aligned with the compositor's tiles.
+    EXPECT_EQ(1u, mock_canvas.rects_.size());
+    EXPECT_EQ(*rect_iter, mock_canvas.rects_[0]);
+    rect_iter++;
+  }
 }
 
 TEST_F(PictureLayerImplTest, CloneNoInvalidation) {
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(400, 400);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
-  SetupTrees(pending_pile, active_pile);
-
-  Region invalidation;
-  AddDefaultTilingsWithInvalidation(invalidation);
+  SetupTreesWithInvalidation(pending_pile, active_pile, Region());
 
   EXPECT_EQ(pending_layer_->tilings()->num_tilings(),
             active_layer_->tilings()->num_tilings());
 
   const PictureLayerTilingSet* tilings = pending_layer_->tilings();
   EXPECT_GT(tilings->num_tilings(), 0u);
   for (size_t i = 0; i < tilings->num_tilings(); ++i)
-    VerifyAllTilesExistAndHavePile(tilings->tiling_at(i), active_pile.get());
+    VerifyAllTilesExistAndHavePile(tilings->tiling_at(i), pending_pile.get());
 }
 
 TEST_F(PictureLayerImplTest, ExternalViewportRectForPrioritizingTiles) {
   base::TimeTicks time_ticks;
   time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentBeginFrameArgs(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(400, 400);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
-  SetupTrees(pending_pile, active_pile);
+  SetupTreesWithInvalidation(pending_pile, active_pile, Region());
 
-  Region invalidation;
-  AddDefaultTilingsWithInvalidation(invalidation);
   SetupDrawPropertiesAndUpdateTiles(active_layer_, 1.f, 1.f, 1.f, 1.f, false);
 
   time_ticks += base::TimeDelta::FromMilliseconds(200);
   host_impl_.SetCurrentBeginFrameArgs(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
 
   // Update tiles with viewport for tile priority as (0, 0, 100, 100) and the
   // identify transform for tile priority.
   bool resourceless_software_draw = false;
   gfx::Rect viewport = gfx::Rect(layer_bounds),
@@ skipping 73 matching lines @@
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(400, 400);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
-  SetupTrees(pending_pile, active_pile);
+  SetupTreesWithInvalidation(pending_pile, active_pile, Region());
 
-  Region invalidation;
-  AddDefaultTilingsWithInvalidation(invalidation);
   SetupDrawPropertiesAndUpdateTiles(active_layer_, 1.f, 1.f, 1.f, 1.f, false);
 
   // UpdateTiles with valid viewport. Should update tile viewport.
   // Note viewport is considered invalid if and only if in resourceless
   // software draw.
   bool resourceless_software_draw = false;
   gfx::Rect viewport = gfx::Rect(layer_bounds);
   gfx::Transform transform;
   host_impl_.SetExternalDrawConstraints(transform,
                                         viewport,
@@ skipping 56 matching lines @@
 
 TEST_F(PictureLayerImplTest, ClonePartialInvalidation) {
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(400, 400);
   gfx::Rect layer_invalidation(150, 200, 30, 180);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+  scoped_refptr<FakePicturePileImpl> lost_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
-  SetupTrees(pending_pile, active_pile);
+  SetupPendingTreeWithFixedTileSize(lost_pile, gfx::Size(50, 50), Region());
+  ActivateTree();
+  // Add a non-shared tiling on the active tree.
+  PictureLayerTiling* tiling = active_layer_->AddTiling(3.f);
+  tiling->CreateAllTilesForTesting();
+  // Then setup a new pending tree and activate it.
+  SetupTreesWithFixedTileSize(pending_pile, active_pile, gfx::Size(50, 50),
+                              layer_invalidation);
 
-  Region invalidation(layer_invalidation);
-  AddDefaultTilingsWithInvalidation(invalidation);
+  EXPECT_EQ(2u, pending_layer_->num_tilings());
+  EXPECT_EQ(3u, active_layer_->num_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());
     for (PictureLayerTiling::CoverageIterator iter(
              tiling,
              tiling->contents_scale(),
              gfx::Rect(tiling->tiling_size()));
          iter;
          ++iter) {
       EXPECT_TRUE(*iter);
       EXPECT_FALSE(iter.geometry_rect().IsEmpty());
-      if (iter.geometry_rect().Intersects(content_invalidation))
-        EXPECT_EQ(pending_pile.get(), iter->raster_source());
-      else
-        EXPECT_EQ(active_pile.get(), iter->raster_source());
+      EXPECT_EQ(pending_pile.get(), iter->raster_source());
     }
   }
-}
 
-TEST_F(PictureLayerImplTest, CloneFullInvalidation) {
-  gfx::Size tile_size(90, 80);
-  gfx::Size layer_bounds(300, 500);
-
-  scoped_refptr<FakePicturePileImpl> pending_pile =
-      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-  scoped_refptr<FakePicturePileImpl> active_pile =
-      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-
-  SetupTrees(pending_pile, active_pile);
-
-  Region invalidation((gfx::Rect(layer_bounds)));
-  AddDefaultTilingsWithInvalidation(invalidation);
-
-  EXPECT_EQ(pending_layer_->tilings()->num_tilings(),
-            active_layer_->tilings()->num_tilings());
-
-  const PictureLayerTilingSet* tilings = pending_layer_->tilings();
-  EXPECT_GT(tilings->num_tilings(), 0u);
-  for (size_t i = 0; i < tilings->num_tilings(); ++i)
-    VerifyAllTilesExistAndHavePile(tilings->tiling_at(i), pending_pile.get());
-}
-
-TEST_F(PictureLayerImplTest, NoInvalidationBoundsChange) {
-  gfx::Size tile_size(90, 80);
-  gfx::Size active_layer_bounds(300, 500);
-  gfx::Size pending_layer_bounds(400, 800);
-
-  scoped_refptr<FakePicturePileImpl> pending_pile =
-      FakePicturePileImpl::CreateFilledPile(tile_size,
-                                                pending_layer_bounds);
-  scoped_refptr<FakePicturePileImpl> active_pile =
-      FakePicturePileImpl::CreateFilledPile(tile_size, active_layer_bounds);
-
-  SetupTrees(pending_pile, active_pile);
-  pending_layer_->set_fixed_tile_size(gfx::Size(100, 100));
-
-  Region invalidation;
-  AddDefaultTilingsWithInvalidation(invalidation);
-
-  const PictureLayerTilingSet* tilings = pending_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 active_content_bounds = gfx::ScaleToEnclosingRect(
-        gfx::Rect(active_layer_bounds),
-        tiling->contents_scale());
+    gfx::Rect content_invalidation =
+        gfx::ScaleToEnclosingRect(layer_invalidation, tiling->contents_scale());
     for (PictureLayerTiling::CoverageIterator iter(
              tiling,
              tiling->contents_scale(),
              gfx::Rect(tiling->tiling_size()));
          iter;
          ++iter) {
       EXPECT_TRUE(*iter);
       EXPECT_FALSE(iter.geometry_rect().IsEmpty());
-      std::vector<Tile*> active_tiles =
-          active_layer_->tilings()->tiling_at(i)->AllTilesForTesting();
-      std::vector<Tile*> pending_tiles = tiling->AllTilesForTesting();
-      if (iter.geometry_rect().right() >= active_content_bounds.width() ||
-          iter.geometry_rect().bottom() >= active_content_bounds.height() ||
-          active_tiles[0]->content_rect().size() !=
-              pending_tiles[0]->content_rect().size()) {
+      if (iter.geometry_rect().Intersects(content_invalidation))
+        EXPECT_EQ(active_pile.get(), iter->raster_source());
+      else if (!active_layer_->GetPendingOrActiveTwinTiling(tiling))
+        EXPECT_EQ(active_pile.get(), iter->raster_source());
+      else
         EXPECT_EQ(pending_pile.get(), iter->raster_source());
-      } else {
-        EXPECT_EQ(active_pile.get(), iter->raster_source());
-      }
     }
   }
 }
 
-TEST_F(PictureLayerImplTest, AddTilesFromNewRecording) {
-  gfx::Size tile_size(400, 400);
-  gfx::Size layer_bounds(1300, 1900);
+TEST_F(PictureLayerImplTest, CloneFullInvalidation) {
+  gfx::Size tile_size(90, 80);
+  gfx::Size layer_bounds(300, 500);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
-      FakePicturePileImpl::CreateEmptyPile(tile_size, layer_bounds);
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
-      FakePicturePileImpl::CreateEmptyPile(tile_size, layer_bounds);
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
-  // Fill in some of active pile, but more of pending pile.
-  int hole_count = 0;
-  for (int x = 0; x < active_pile->tiling().num_tiles_x(); ++x) {
-    for (int y = 0; y < active_pile->tiling().num_tiles_y(); ++y) {
-      if ((x + y) % 2) {
-        pending_pile->AddRecordingAt(x, y);
-        active_pile->AddRecordingAt(x, y);
-      } else {
-        hole_count++;
-        if (hole_count % 2)
-          pending_pile->AddRecordingAt(x, y);
-      }
-    }
-  }
+  SetupTreesWithInvalidation(pending_pile, active_pile,
+                             gfx::Rect(layer_bounds));
 
-  SetupTrees(pending_pile, active_pile);
-  Region invalidation;
-  AddDefaultTilingsWithInvalidation(invalidation);
+  EXPECT_EQ(pending_layer_->tilings()->num_tilings(),
+            active_layer_->tilings()->num_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);
-
-    for (PictureLayerTiling::CoverageIterator iter(
-             tiling,
-             tiling->contents_scale(),
-             gfx::Rect(tiling->tiling_size()));
-         iter;
-         ++iter) {
-      EXPECT_FALSE(iter.full_tile_geometry_rect().IsEmpty());
-      // Ensure there is a recording for this tile.
-      bool in_pending = pending_pile->CoversRect(iter.full_tile_geometry_rect(),
-                                                 tiling->contents_scale());
-      bool in_active = active_pile->CoversRect(iter.full_tile_geometry_rect(),
-                                               tiling->contents_scale());
-
-      if (in_pending && !in_active)
-        EXPECT_EQ(pending_pile.get(), iter->raster_source());
-      else if (in_active)
-        EXPECT_EQ(active_pile.get(), iter->raster_source());
-      else
-        EXPECT_FALSE(*iter);
-    }
-  }
-}
-
-TEST_F(PictureLayerImplTest, ManageTilingsWithNoRecording) {
-  gfx::Size tile_size(400, 400);
-  gfx::Size layer_bounds(1300, 1900);
-
-  scoped_refptr<FakePicturePileImpl> pending_pile =
-      FakePicturePileImpl::CreateEmptyPile(tile_size, layer_bounds);
-  scoped_refptr<FakePicturePileImpl> active_pile =
-      FakePicturePileImpl::CreateEmptyPile(tile_size, layer_bounds);
-
-  SetupTrees(pending_pile, active_pile);
-
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.f, 1.f, 1.f, 1.f, false);
-
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
+  for (size_t i = 0; i < tilings->num_tilings(); ++i)
+    VerifyAllTilesExistAndHavePile(tilings->tiling_at(i), pending_pile.get());
 }
 
 TEST_F(PictureLayerImplTest, ManageTilingsCreatesTilings) {
   gfx::Size tile_size(400, 400);
   gfx::Size layer_bounds(1300, 1900);
 
+  scoped_refptr<FakePicturePileImpl> pending_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+  scoped_refptr<FakePicturePileImpl> active_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+
+  SetupTrees(pending_pile, active_pile);
+
+  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  EXPECT_LT(low_res_factor, 1.f);
+
+  active_layer_->ReleaseResources();
+  EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
+
+  SetupDrawPropertiesAndUpdateTiles(active_layer_,
+                                    6.f,  // ideal contents scale
+                                    3.f,  // device scale
+                                    2.f,  // page scale
+                                    1.f,  // maximum animation scale
+                                    false);
+  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  EXPECT_FLOAT_EQ(6.f,
+                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+  EXPECT_FLOAT_EQ(6.f * low_res_factor,
+                  active_layer_->tilings()->tiling_at(1)->contents_scale());
+
+  // If we change the page scale factor, then we should get new tilings.
+  SetupDrawPropertiesAndUpdateTiles(active_layer_,
+                                    6.6f,  // ideal contents scale
+                                    3.f,   // device scale
+                                    2.2f,  // page scale
+                                    1.f,   // maximum animation scale
+                                    false);
+  ASSERT_EQ(4u, active_layer_->tilings()->num_tilings());
+  EXPECT_FLOAT_EQ(6.6f,
+                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+  EXPECT_FLOAT_EQ(6.6f * low_res_factor,
+                  active_layer_->tilings()->tiling_at(2)->contents_scale());
+
+  // If we change the device scale factor, then we should get new tilings.
+  SetupDrawPropertiesAndUpdateTiles(active_layer_,
+                                    7.26f,  // ideal contents scale
+                                    3.3f,   // device scale
+                                    2.2f,   // page scale
+                                    1.f,    // maximum animation scale
+                                    false);
+  ASSERT_EQ(6u, active_layer_->tilings()->num_tilings());
+  EXPECT_FLOAT_EQ(7.26f,
+                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+  EXPECT_FLOAT_EQ(7.26f * low_res_factor,
+                  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_,
+                                    7.26f,  // ideal contents scale
+                                    2.2f,   // device scale
+                                    3.3f,   // page scale
+                                    1.f,    // maximum animation scale
+                                    false);
+  ASSERT_EQ(6u, active_layer_->tilings()->num_tilings());
+  EXPECT_FLOAT_EQ(7.26f,
+                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+  EXPECT_FLOAT_EQ(7.26f * low_res_factor,
+                  active_layer_->tilings()->tiling_at(3)->contents_scale());
+}
+
+TEST_F(PictureLayerImplTest, PendingLayerOnlyHasHighAndLowResTiling) {
+  gfx::Size tile_size(400, 400);
+  gfx::Size layer_bounds(1300, 1900);
+
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
   SetupTrees(pending_pile, active_pile);
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
 
   float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
   EXPECT_LT(low_res_factor, 1.f);
 
+  pending_layer_->ReleaseResources();
+  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
+
   SetupDrawPropertiesAndUpdateTiles(pending_layer_,
                                     6.f,  // ideal contents scale
                                     3.f,  // device scale
                                     2.f,  // page scale
                                     1.f,  // maximum animation scale
                                     false);
   ASSERT_EQ(2u, pending_layer_->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(6.f,
                   pending_layer_->tilings()->tiling_at(0)->contents_scale());
   EXPECT_FLOAT_EQ(6.f * low_res_factor,
                   pending_layer_->tilings()->tiling_at(1)->contents_scale());
 
   // If we change the page scale factor, then we should get new tilings.
   SetupDrawPropertiesAndUpdateTiles(pending_layer_,
                                     6.6f,  // ideal contents scale
                                     3.f,   // device scale
                                     2.2f,  // page scale
                                     1.f,   // maximum animation scale
                                     false);
-  ASSERT_EQ(4u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(2u, pending_layer_->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(6.6f,
                   pending_layer_->tilings()->tiling_at(0)->contents_scale());
   EXPECT_FLOAT_EQ(6.6f * low_res_factor,
-                  pending_layer_->tilings()->tiling_at(2)->contents_scale());
+                  pending_layer_->tilings()->tiling_at(1)->contents_scale());
 
   // If we change the device scale factor, then we should get new tilings.
   SetupDrawPropertiesAndUpdateTiles(pending_layer_,
                                     7.26f,  // ideal contents scale
                                     3.3f,   // device scale
                                     2.2f,   // page scale
                                     1.f,    // maximum animation scale
                                     false);
-  ASSERT_EQ(6u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(2u, pending_layer_->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(7.26f,
                   pending_layer_->tilings()->tiling_at(0)->contents_scale());
   EXPECT_FLOAT_EQ(7.26f * low_res_factor,
-                  pending_layer_->tilings()->tiling_at(3)->contents_scale());
+                  pending_layer_->tilings()->tiling_at(1)->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_,
                                     7.26f,  // ideal contents scale
                                     2.2f,   // device scale
                                     3.3f,   // page scale
                                     1.f,    // maximum animation scale
                                     false);
-  ASSERT_EQ(6u, pending_layer_->tilings()->num_tilings());
+  ASSERT_EQ(2u, pending_layer_->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(7.26f,
                   pending_layer_->tilings()->tiling_at(0)->contents_scale());
   EXPECT_FLOAT_EQ(7.26f * low_res_factor,
-                  pending_layer_->tilings()->tiling_at(3)->contents_scale());
+                  pending_layer_->tilings()->tiling_at(1)->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 tile_size(400, 400);
   gfx::Size layer_bounds(1300, 1900);
 
   scoped_refptr<FakePicturePileImpl> empty_pile =
       FakePicturePileImpl::CreateEmptyPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> valid_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
-  EXPECT_LT(low_res_factor, 1.f);
-
-  float high_res_scale = 1.3f;
-  float low_res_scale = high_res_scale * low_res_factor;
-  float device_scale = 1.7f;
-  float page_scale = 3.2f;
-  float maximum_animation_scale = 1.f;
-
   SetupPendingTree(valid_pile);
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
-                                    high_res_scale,
-                                    device_scale,
-                                    page_scale,
-                                    maximum_animation_scale,
-                                    false);
   ASSERT_EQ(2u, pending_layer_->tilings()->num_tilings());
-  EXPECT_FLOAT_EQ(high_res_scale,
-                  pending_layer_->HighResTiling()->contents_scale());
-  EXPECT_FLOAT_EQ(low_res_scale,
-                  pending_layer_->LowResTiling()->contents_scale());
 
   ActivateTree();
   SetupPendingTree(empty_pile);
   EXPECT_FALSE(pending_layer_->CanHaveTilings());
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
-                                    high_res_scale,
-                                    device_scale,
-                                    page_scale,
-                                    maximum_animation_scale,
-                                    false);
   ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
   ASSERT_EQ(0u, pending_layer_->tilings()->num_tilings());
 
   ActivateTree();
   EXPECT_FALSE(active_layer_->CanHaveTilings());
-  SetupDrawPropertiesAndUpdateTiles(active_layer_,
-                                    high_res_scale,
-                                    device_scale,
-                                    page_scale,
-                                    maximum_animation_scale,
-                                    false);
   ASSERT_EQ(0u, active_layer_->tilings()->num_tilings());
 
   SetupPendingTree(valid_pile);
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
-                                    high_res_scale,
-                                    device_scale,
-                                    page_scale,
-                                    maximum_animation_scale,
-                                    false);
   ASSERT_EQ(2u, pending_layer_->tilings()->num_tilings());
   ASSERT_EQ(0u, active_layer_->tilings()->num_tilings());
-  EXPECT_FLOAT_EQ(high_res_scale,
-                  pending_layer_->HighResTiling()->contents_scale());
-  EXPECT_FLOAT_EQ(low_res_scale,
-                  pending_layer_->LowResTiling()->contents_scale());
 }
 
 TEST_F(PictureLayerImplTest, ZoomOutCrash) {
   gfx::Size tile_size(400, 400);
   gfx::Size layer_bounds(1300, 1900);
 
   // Set up the high and low res tilings before pinch zoom.
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
   SetupTrees(pending_pile, active_pile);
+  ResetTilingsAndRasterScales();
   EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
   SetContentsScaleOnBothLayers(32.0f, 1.0f, 32.0f, 1.0f, false);
+  EXPECT_EQ(32.f, active_layer_->HighResTiling()->contents_scale());
   host_impl_.PinchGestureBegin();
   SetContentsScaleOnBothLayers(1.0f, 1.0f, 1.0f, 1.0f, false);
   SetContentsScaleOnBothLayers(1.0f, 1.0f, 1.0f, 1.0f, false);
   EXPECT_EQ(active_layer_->tilings()->NumHighResTilings(), 1);
 }
 
 TEST_F(PictureLayerImplTest, PinchGestureTilings) {
   gfx::Size tile_size(400, 400);
   gfx::Size layer_bounds(1300, 1900);
 
+  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
   // Set up the high and low res tilings before pinch zoom.
   SetupTrees(pending_pile, active_pile);
-  EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
-  SetContentsScaleOnBothLayers(2.0f, 1.0f, 1.0f, 1.0f, false);
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
-  EXPECT_EQ(2u, active_layer_->tilings()->num_tilings());
-  EXPECT_FLOAT_EQ(2.0f,
-                  active_layer_->tilings()->tiling_at(0)->contents_scale());
-  EXPECT_FLOAT_EQ(2.0f * low_res_factor,
-                  active_layer_->tilings()->tiling_at(1)->contents_scale());
+  ResetTilingsAndRasterScales();
+
+  SetContentsScaleOnBothLayers(2.f, 1.0f, 2.f, 1.0f, false);
+  EXPECT_BOTH_EQ(num_tilings(), 2u);
+  EXPECT_BOTH_EQ(tilings()->tiling_at(0)->contents_scale(), 2.f);
+  EXPECT_BOTH_EQ(tilings()->tiling_at(1)->contents_scale(),
+                 2.f * low_res_factor);
 
   // Start a pinch gesture.
   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, 0.9f, 1.0f, false);
+  SetContentsScaleOnBothLayers(1.8f, 1.0f, 1.8f, 1.0f, false);
   EXPECT_EQ(3u, active_layer_->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(2.0f,
                   active_layer_->tilings()->tiling_at(0)->contents_scale());
   EXPECT_FLOAT_EQ(1.0f,
                   active_layer_->tilings()->tiling_at(1)->contents_scale());
   EXPECT_FLOAT_EQ(2.0f * low_res_factor,
                   active_layer_->tilings()->tiling_at(2)->contents_scale());
 
   // 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, false);
   EXPECT_EQ(3u, active_layer_->tilings()->num_tilings());
 
   // 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, 2.1f, 1.f, false);
+  SetContentsScaleOnBothLayers(3.8f, 1.0f, 3.8f, 1.f, false);
   EXPECT_EQ(4u, active_layer_->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(4.0f,
                   active_layer_->tilings()->tiling_at(0)->contents_scale());
 }
 
 TEST_F(PictureLayerImplTest, SnappedTilingDuringZoom) {
   gfx::Size tile_size(300, 300);
   gfx::Size layer_bounds(2600, 3800);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
+  SetupTrees(pending_pile, active_pile);
+
+  ResetTilingsAndRasterScales();
+  EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
+
   // Set up the high and low res tilings before pinch zoom.
-  SetupTrees(pending_pile, active_pile);
-  EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
   SetContentsScaleOnBothLayers(0.24f, 1.0f, 0.24f, 1.0f, false);
   EXPECT_EQ(2u, active_layer_->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(0.24f,
                   active_layer_->tilings()->tiling_at(0)->contents_scale());
   EXPECT_FLOAT_EQ(0.0625f,
                   active_layer_->tilings()->tiling_at(1)->contents_scale());
 
   // Start a pinch gesture.
   host_impl_.PinchGestureBegin();
 
@@ skipping 30 matching lines @@
   gfx::Size tile_size(400, 400);
   gfx::Size layer_bounds(1300, 1900);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
   std::vector<PictureLayerTiling*> used_tilings;
 
-  SetupTrees(pending_pile, active_pile);
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
-
   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;
+  float page_scale = 1.f;
 
-  SetContentsScaleOnBothLayers(scale, device_scale, page_scale, 1.f, false);
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  SetupTrees(pending_pile, active_pile);
+  EXPECT_EQ(2u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(1.f, active_layer_->HighResTiling()->contents_scale());
 
   // We only have ideal tilings, so they aren't removed.
   used_tilings.clear();
   active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  EXPECT_EQ(2u, active_layer_->tilings()->num_tilings());
 
   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, false);
-  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  scale = 1.5f;
+  page_scale = 1.5f;
+  SetContentsScaleOnBothLayers(scale, 1.f, page_scale, 1.f, false);
+  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());
 
   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, false);
+  scale = 1.2f;
+  page_scale = 1.2f;
+  SetContentsScaleOnBothLayers(1.2f, 1.f, page_scale, 1.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());
 
   // 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());
 
   // Now move the ideal scale to 0.5. Our target stays 1.2.
-  SetContentsScaleOnBothLayers(0.5f, device_scale, page_scale, 1.f, false);
+  SetContentsScaleOnBothLayers(0.5f, 1.f, page_scale, 1.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());
 
   // Now move the ideal scale to 1.0. Our target stays 1.2.
-  SetContentsScaleOnBothLayers(1.f, device_scale, page_scale, 1.f, false);
+  SetContentsScaleOnBothLayers(1.f, 1.f, page_scale, 1.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());
 
   // Now move the ideal scale to 1.1 on the active layer. Our target stays 1.2.
-  SetupDrawPropertiesAndUpdateTiles(
-      active_layer_, 1.1f, device_scale, page_scale, 1.f, false);
+  SetupDrawPropertiesAndUpdateTiles(active_layer_, 1.1f, 1.f, page_scale, 1.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());
 
   // 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, page_scale, 1.f, false);
+  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.1f, 1.f, page_scale, 1.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());
 
   // 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());
 }
 
-#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);  \
-  } while (false)
-
 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);
-  SetupDefaultTrees(gfx::Size(tile_size.width() + 1, tile_size.height() + 1));
   // Avoid max untiled layer size heuristics via fixed tile size.
-  pending_layer_->set_fixed_tile_size(tile_size);
-  active_layer_->set_fixed_tile_size(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 contents_scale = 1.f;
   float device_scale = 1.f;
   float page_scale = 1.f;
   float maximum_animation_scale = 1.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,
                                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,
                                animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 1.f);
   EXPECT_BOTH_EQ(LowResTiling()->contents_scale(), low_res_factor);
   EXPECT_BOTH_EQ(num_tilings(), 2u);
 
   // 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.
+  // 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,
                                animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 2.f);
   EXPECT_FALSE(active_layer_->LowResTiling());
   EXPECT_FALSE(pending_layer_->LowResTiling());
-  EXPECT_BOTH_EQ(num_tilings(), 3u);
+  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,
                                animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 2.f);
   EXPECT_BOTH_EQ(LowResTiling()->contents_scale(), 2.f * low_res_factor);
-  EXPECT_BOTH_EQ(num_tilings(), 4u);
+  EXPECT_EQ(4u, active_layer_->num_tilings());
+  EXPECT_EQ(2u, pending_layer_->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, DontAddLowResForSmallLayers) {
   gfx::Size layer_bounds(host_impl_.settings().default_tile_size);
   gfx::Size tile_size(100, 100);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
@@ skipping 36 matching lines @@
   SetContentsScaleOnBothLayers(contents_scale,
                                device_scale,
                                page_scale,
                                maximum_animation_scale,
                                animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), contents_scale);
   EXPECT_BOTH_EQ(LowResTiling()->contents_scale(),
                  contents_scale * low_res_factor);
   EXPECT_BOTH_EQ(num_tilings(), 2u);
 
-  ResetTilingsAndRasterScales();
+  // Mask layers dont create low res since they always fit on one tile.
+  scoped_ptr<FakePictureLayerImpl> mask =
+      FakePictureLayerImpl::CreateMaskWithRasterSource(
+          host_impl_.pending_tree(), 3, pending_pile);
+  mask->SetBounds(layer_bounds);
+  mask->SetContentBounds(layer_bounds);
+  mask->SetDrawsContent(true);
 
-  // Mask layers dont create low res since they always fit on one tile.
-  pending_layer_->set_is_mask(true);
-  active_layer_->set_is_mask(true);
-  SetContentsScaleOnBothLayers(contents_scale,
-                               device_scale,
-                               page_scale,
-                               maximum_animation_scale,
-                               animating_transform);
-  EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), contents_scale);
-  EXPECT_BOTH_EQ(num_tilings(), 1u);
+  SetupDrawPropertiesAndUpdateTiles(mask.get(), contents_scale, device_scale,
+                                    page_scale, maximum_animation_scale,
+                                    animating_transform);
+  EXPECT_EQ(mask->HighResTiling()->contents_scale(), contents_scale);
+  EXPECT_EQ(mask->num_tilings(), 1u);
 }
 
 TEST_F(PictureLayerImplTest, HugeMasksDontGetTiles) {
+  base::TimeTicks time_ticks;
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
+  host_impl_.SetCurrentBeginFrameArgs(
+      CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
+
   gfx::Size tile_size(100, 100);
+  gfx::Size layer_bounds(1000, 1000);
 
   scoped_refptr<FakePicturePileImpl> valid_pile =
-      FakePicturePileImpl::CreateFilledPile(tile_size, gfx::Size(1000, 1000));
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   SetupPendingTree(valid_pile);
-  pending_layer_->set_is_mask(true);
 
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.f, 1.f, 1.f, 1.f, false);
-  EXPECT_EQ(1.f, pending_layer_->HighResTiling()->contents_scale());
-  EXPECT_EQ(1u, pending_layer_->num_tilings());
+  scoped_ptr<FakePictureLayerImpl> mask_ptr =
+      FakePictureLayerImpl::CreateMaskWithRasterSource(
+          host_impl_.pending_tree(), 3, valid_pile);
+  mask_ptr->SetBounds(layer_bounds);
+  mask_ptr->SetContentBounds(layer_bounds);
+  mask_ptr->SetDrawsContent(true);
+  pending_layer_->SetMaskLayer(mask_ptr.Pass());
 
-  pending_layer_->HighResTiling()->CreateAllTilesForTesting();
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
+  host_impl_.SetCurrentBeginFrameArgs(
+      CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
+  host_impl_.pending_tree()->UpdateDrawProperties();
+
+  FakePictureLayerImpl* pending_mask =
+      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(
-      pending_layer_->HighResTiling()->AllTilesForTesting());
+      pending_mask->HighResTiling()->AllTilesForTesting());
 
   ActivateTree();
 
+  FakePictureLayerImpl* active_mask =
+      static_cast<FakePictureLayerImpl*>(active_layer_->mask_layer());
+
   // Mask layers have a tiling with a single tile in it.
-  EXPECT_EQ(1u, active_layer_->HighResTiling()->AllTilesForTesting().size());
+  EXPECT_EQ(1u, active_mask->HighResTiling()->AllTilesForTesting().size());
   // The mask resource exists.
   ResourceProvider::ResourceId mask_resource_id;
   gfx::Size mask_texture_size;
-  active_layer_->GetContentsResourceId(&mask_resource_id, &mask_texture_size);
+  active_mask->GetContentsResourceId(&mask_resource_id, &mask_texture_size);
+  EXPECT_NE(0u, mask_resource_id);
+  EXPECT_EQ(mask_texture_size, active_mask->bounds());
+
+  // Drop resources and recreate them, still the same.
+  pending_mask->ReleaseResources();
+  active_mask->ReleaseResources();
+  SetupDrawPropertiesAndUpdateTiles(active_mask, 1.f, 1.f, 1.f, 1.f, false);
+  active_mask->HighResTiling()->CreateAllTilesForTesting();
+  EXPECT_EQ(1u, active_mask->HighResTiling()->AllTilesForTesting().size());
   EXPECT_NE(0u, mask_resource_id);
   EXPECT_EQ(mask_texture_size, active_layer_->bounds());
 
   // Drop resources and recreate them, still the same.
-  old_pending_layer_->ReleaseResources();
-  active_layer_->ReleaseResources();
-  SetupDrawPropertiesAndUpdateTiles(active_layer_, 1.f, 1.f, 1.f, 1.f, false);
-  active_layer_->HighResTiling()->CreateAllTilesForTesting();
-  EXPECT_EQ(1u, active_layer_->HighResTiling()->AllTilesForTesting().size());
+  pending_mask->ReleaseResources();
+  active_mask->ReleaseResources();
+  SetupDrawPropertiesAndUpdateTiles(active_mask, 1.f, 1.f, 1.f, 1.f, false);
+  active_mask->HighResTiling()->CreateAllTilesForTesting();
+  EXPECT_EQ(1u, active_mask->HighResTiling()->AllTilesForTesting().size());
   EXPECT_NE(0u, mask_resource_id);
-  EXPECT_EQ(mask_texture_size, active_layer_->bounds());
+  EXPECT_EQ(mask_texture_size, active_mask->bounds());
 
   // Resize larger than the max texture size.
   int max_texture_size = host_impl_.GetRendererCapabilities().max_texture_size;
+  gfx::Size huge_bounds(max_texture_size + 1, 10);
   scoped_refptr<FakePicturePileImpl> huge_pile =
-      FakePicturePileImpl::CreateFilledPile(
-          tile_size, gfx::Size(max_texture_size + 1, 10));
+      FakePicturePileImpl::CreateFilledPile(tile_size, huge_bounds);
+
   SetupPendingTree(huge_pile);
-  pending_layer_->set_is_mask(true);
+  pending_mask->SetBounds(huge_bounds);
+  pending_mask->SetContentBounds(huge_bounds);
+  pending_mask->SetRasterSourceOnPending(huge_pile, Region());
 
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.f, 1.f, 1.f, 1.f, false);
-  EXPECT_EQ(1.f, pending_layer_->HighResTiling()->contents_scale());
-  EXPECT_EQ(1u, pending_layer_->num_tilings());
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
+  host_impl_.SetCurrentBeginFrameArgs(
+      CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
+  host_impl_.pending_tree()->UpdateDrawProperties();
 
-  pending_layer_->HighResTiling()->CreateAllTilesForTesting();
+  EXPECT_EQ(1.f, pending_mask->HighResTiling()->contents_scale());
+  EXPECT_EQ(1u, pending_mask->num_tilings());
+
   host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(
-      pending_layer_->HighResTiling()->AllTilesForTesting());
+      pending_mask->HighResTiling()->AllTilesForTesting());
 
   ActivateTree();
 
   // Mask layers have a tiling, but there should be no tiles in it.
-  EXPECT_EQ(0u, active_layer_->HighResTiling()->AllTilesForTesting().size());
+  EXPECT_EQ(0u, active_mask->HighResTiling()->AllTilesForTesting().size());
   // The mask resource is empty.
   active_layer_->GetContentsResourceId(&mask_resource_id, &mask_texture_size);
   EXPECT_EQ(0u, mask_resource_id);
 
   // Drop resources and recreate them, still the same.
-  old_pending_layer_->ReleaseResources();
-  active_layer_->ReleaseResources();
-  SetupDrawPropertiesAndUpdateTiles(active_layer_, 1.f, 1.f, 1.f, 1.f, false);
-  active_layer_->HighResTiling()->CreateAllTilesForTesting();
-  EXPECT_EQ(0u, active_layer_->HighResTiling()->AllTilesForTesting().size());
+  pending_mask->ReleaseResources();
+  active_mask->ReleaseResources();
+  SetupDrawPropertiesAndUpdateTiles(active_mask, 1.f, 1.f, 1.f, 1.f, false);
+  active_mask->HighResTiling()->CreateAllTilesForTesting();
+  EXPECT_EQ(0u, active_mask->HighResTiling()->AllTilesForTesting().size());
+  active_mask->GetContentsResourceId(&mask_resource_id, &mask_texture_size);
+  EXPECT_EQ(0u, mask_resource_id);
+
+  // Do another activate, the same holds.
+  SetupPendingTree(huge_pile);
+  ActivateTree();
+  EXPECT_EQ(0u, active_mask->HighResTiling()->AllTilesForTesting().size());
   active_layer_->GetContentsResourceId(&mask_resource_id, &mask_texture_size);
   EXPECT_EQ(0u, mask_resource_id);
 }
 
 TEST_F(PictureLayerImplTest, ScaledMaskLayer) {
+  base::TimeTicks time_ticks;
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
+  host_impl_.SetCurrentBeginFrameArgs(
+      CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
+
   gfx::Size tile_size(100, 100);
+  gfx::Size layer_bounds(1000, 1000);
+
+  host_impl_.SetDeviceScaleFactor(1.3f);
 
   scoped_refptr<FakePicturePileImpl> valid_pile =
-      FakePicturePileImpl::CreateFilledPile(tile_size, gfx::Size(1000, 1000));
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   SetupPendingTree(valid_pile);
-  pending_layer_->set_is_mask(true);
 
-  float ideal_contents_scale = 1.3f;
-  SetupDrawPropertiesAndUpdateTiles(
-      pending_layer_, ideal_contents_scale, 1.f, 1.f, 1.f, false);
-  EXPECT_EQ(ideal_contents_scale,
-            pending_layer_->HighResTiling()->contents_scale());
-  EXPECT_EQ(1u, pending_layer_->num_tilings());
+  scoped_ptr<FakePictureLayerImpl> mask_ptr =
+      FakePictureLayerImpl::CreateMaskWithRasterSource(
+          host_impl_.pending_tree(), 3, valid_pile);
+  mask_ptr->SetBounds(layer_bounds);
+  mask_ptr->SetContentBounds(layer_bounds);
+  mask_ptr->SetDrawsContent(true);
+  pending_layer_->SetMaskLayer(mask_ptr.Pass());
 
-  pending_layer_->HighResTiling()->CreateAllTilesForTesting();
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
+  host_impl_.SetCurrentBeginFrameArgs(
+      CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
+  host_impl_.pending_tree()->UpdateDrawProperties();
+
+  FakePictureLayerImpl* pending_mask =
+      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(
-      pending_layer_->HighResTiling()->AllTilesForTesting());
+      pending_mask->HighResTiling()->AllTilesForTesting());
 
   ActivateTree();
 
+  FakePictureLayerImpl* active_mask =
+      static_cast<FakePictureLayerImpl*>(active_layer_->mask_layer());
+
   // Mask layers have a tiling with a single tile in it.
-  EXPECT_EQ(1u, active_layer_->HighResTiling()->AllTilesForTesting().size());
+  EXPECT_EQ(1u, active_mask->HighResTiling()->AllTilesForTesting().size());
   // The mask resource exists.
   ResourceProvider::ResourceId mask_resource_id;
   gfx::Size mask_texture_size;
-  active_layer_->GetContentsResourceId(&mask_resource_id, &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::ToCeiledSize(
-      gfx::ScaleSize(active_layer_->bounds(), ideal_contents_scale));
+  gfx::Size expected_mask_texture_size =
+      gfx::ToCeiledSize(gfx::ScaleSize(active_mask->bounds(), 1.3f));
   EXPECT_EQ(mask_texture_size, expected_mask_texture_size);
 }
 
 TEST_F(PictureLayerImplTest, ReleaseResources) {
   gfx::Size tile_size(400, 400);
   gfx::Size layer_bounds(1300, 1900);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
   SetupTrees(pending_pile, active_pile);
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
-
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
-                                    1.3f,  // ideal contents scale
-                                    2.7f,  // device scale
-                                    3.2f,  // page scale
-                                    1.f,   // maximum animation scale
-                                    false);
   EXPECT_EQ(2u, pending_layer_->tilings()->num_tilings());
 
   // All tilings should be removed when losing output surface.
   active_layer_->ReleaseResources();
   EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
   pending_layer_->ReleaseResources();
   EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
 
   // This should create new tilings.
   SetupDrawPropertiesAndUpdateTiles(pending_layer_,
-                                    1.3f,  // ideal contents scale
-                                    2.7f,  // device scale
-                                    3.2f,  // page scale
-                                    1.f,   // maximum animation scale
+                                    1.f,  // ideal contents scale
+                                    1.f,  // device scale
+                                    1.f,  // page scale
+                                    1.f,  // maximum animation scale
                                     false);
   EXPECT_EQ(2u, pending_layer_->tilings()->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, ClampTilesToToMaxTileSize) {
   // The default max tile size is larger than 400x400.
   gfx::Size tile_size(400, 400);
   gfx::Size layer_bounds(5000, 5000);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
   SetupTrees(pending_pile, active_pile);
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
-
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.f, 1.f, 1.f, 1.f, false);
-  ASSERT_EQ(2u, pending_layer_->tilings()->num_tilings());
+  EXPECT_GE(pending_layer_->tilings()->num_tilings(), 1u);
 
   pending_layer_->tilings()->tiling_at(0)->CreateAllTilesForTesting();
 
   // The default value.
   EXPECT_EQ(gfx::Size(256, 256).ToString(),
             host_impl_.settings().default_tile_size.ToString());
 
   Tile* tile = pending_layer_->tilings()->tiling_at(0)->AllTilesForTesting()[0];
   EXPECT_EQ(gfx::Size(256, 256).ToString(),
             tile->content_rect().size().ToString());
 
-  pending_layer_->ReleaseResources();
+  ResetTilingsAndRasterScales();
 
   // Change the max texture size on the output surface context.
   scoped_ptr<TestWebGraphicsContext3D> context =
       TestWebGraphicsContext3D::Create();
   context->set_max_texture_size(140);
   host_impl_.DidLoseOutputSurface();
   host_impl_.InitializeRenderer(
       FakeOutputSurface::Create3d(context.Pass()).Pass());
 
   SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.f, 1.f, 1.f, 1.f, false);
@@ skipping 11 matching lines @@
   // The default max tile size is larger than 400x400.
   gfx::Size tile_size(400, 400);
   gfx::Size layer_bounds(500, 500);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
   SetupTrees(pending_pile, active_pile);
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
-
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.f, 1.f, 1.f, 1.f, false);
-  ASSERT_LE(1u, pending_layer_->tilings()->num_tilings());
+  EXPECT_GE(pending_layer_->tilings()->num_tilings(), 1u);
 
   pending_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());
 
   // There should be a single tile since the layer is small.
   PictureLayerTiling* high_res_tiling = pending_layer_->tilings()->tiling_at(0);
   EXPECT_EQ(1u, high_res_tiling->AllTilesForTesting().size());
 
-  pending_layer_->ReleaseResources();
+  ResetTilingsAndRasterScales();
 
   // Change the max texture size on the output surface context.
   scoped_ptr<TestWebGraphicsContext3D> context =
       TestWebGraphicsContext3D::Create();
   context->set_max_texture_size(140);
   host_impl_.DidLoseOutputSurface();
   host_impl_.InitializeRenderer(
       FakeOutputSurface::Create3d(context.Pass()).Pass());
 
   SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.f, 1.f, 1.f, 1.f, false);
@@ skipping 16 matching lines @@
   scoped_ptr<RenderPass> render_pass = RenderPass::Create();
 
   gfx::Size tile_size(400, 400);
   gfx::Size layer_bounds(1300, 1900);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
-  SetupTrees(pending_pile, active_pile);
+  gfx::Rect layer_invalidation(150, 200, 30, 180);
+  SetupTreesWithInvalidation(pending_pile, active_pile, layer_invalidation);
 
   active_layer_->draw_properties().visible_content_rect =
       gfx::Rect(layer_bounds);
 
-  gfx::Rect layer_invalidation(150, 200, 30, 180);
-  Region invalidation(layer_invalidation);
-  AddDefaultTilingsWithInvalidation(invalidation);
-
   AppendQuadsData data;
   active_layer_->WillDraw(DRAW_MODE_RESOURCELESS_SOFTWARE, nullptr);
   active_layer_->AppendQuads(render_pass.get(), Occlusion(), &data);
   active_layer_->DidDraw(nullptr);
 
   ASSERT_EQ(1U, render_pass->quad_list.size());
   EXPECT_EQ(DrawQuad::PICTURE_CONTENT,
             render_pass->quad_list.front()->material);
 }
 
@@ skipping 37 matching lines @@
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateEmptyPileThatThinksItHasRecordings(
           tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateEmptyPileThatThinksItHasRecordings(
           tile_size, layer_bounds);
 
   pending_pile->set_is_solid_color(false);
   active_pile->set_is_solid_color(true);
   SetupTrees(pending_pile, active_pile);
-  // Solid color layer should not have tilings.
-  ASSERT_FALSE(active_layer_->CanHaveTilings());
-
-  // Update properties with solid color pile should not allow tilings at any
-  // scale.
-  host_impl_.active_tree()->UpdateDrawProperties();
+  // Solid color pile should not allow tilings at any scale.
   EXPECT_FALSE(active_layer_->CanHaveTilings());
   EXPECT_EQ(0.f, active_layer_->ideal_contents_scale());
 
-  // Push non-solid-color pending pile makes active layer can have tilings.
-  active_layer_->UpdateRasterSource(pending_pile);
-  ASSERT_TRUE(active_layer_->CanHaveTilings());
-
-  // Update properties with non-solid color pile should allow tilings.
-  host_impl_.active_tree()->UpdateDrawProperties();
+  // Activate non-solid-color pending pile makes active layer can have tilings.
+  ActivateTree();
   EXPECT_TRUE(active_layer_->CanHaveTilings());
   EXPECT_GT(active_layer_->ideal_contents_scale(), 0.f);
 }
 
-TEST_F(PictureLayerImplTest, MarkRequiredOffscreenTiles) {
+TEST_F(NoLowResPictureLayerImplTest, MarkRequiredOffscreenTiles) {
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(200, 200);
 
-  scoped_refptr<FakePicturePileImpl> pending_pile =
-      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-  SetupPendingTree(pending_pile);
-
   gfx::Transform transform;
   gfx::Transform transform_for_tile_priority;
   bool resourceless_software_draw = false;
   gfx::Rect viewport(0, 0, 100, 200);
   host_impl_.SetExternalDrawConstraints(transform,
                                         viewport,
                                         viewport,
                                         viewport,
                                         transform,
                                         resourceless_software_draw);
 
-  pending_layer_->set_fixed_tile_size(tile_size);
-  ASSERT_TRUE(pending_layer_->CanHaveTilings());
-  PictureLayerTiling* tiling = pending_layer_->AddTiling(1.f);
-  host_impl_.pending_tree()->UpdateDrawProperties();
+  scoped_refptr<FakePicturePileImpl> pending_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+  SetupPendingTreeWithFixedTileSize(pending_pile, tile_size, Region());
+
+  EXPECT_EQ(1u, pending_layer_->num_tilings());
   EXPECT_EQ(viewport, pending_layer_->visible_rect_for_tile_priority());
 
   base::TimeTicks time_ticks;
   time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentBeginFrameArgs(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
   pending_layer_->UpdateTiles(Occlusion(), resourceless_software_draw);
-  EXPECT_EQ(HIGH_RESOLUTION, tiling->resolution());
 
   int num_visible = 0;
   int num_offscreen = 0;
 
-  for (PictureLayerTiling::TilingRasterTileIterator iter(tiling); iter;
-       ++iter) {
+  for (PictureLayerTiling::TilingRasterTileIterator iter(
+           pending_layer_->HighResTiling());
+       iter; ++iter) {
     const Tile* tile = *iter;
     DCHECK(tile);
     if (tile->priority(PENDING_TREE).distance_to_visible == 0.f) {
       EXPECT_TRUE(tile->required_for_activation());
       num_visible++;
     } else {
       EXPECT_FALSE(tile->required_for_activation());
       num_offscreen++;
     }
   }
 
   EXPECT_GT(num_visible, 0);
   EXPECT_GT(num_offscreen, 0);
 }
 
-TEST_F(PictureLayerImplTest, TileOutsideOfViewportForTilePriorityNotRequired) {
+TEST_F(NoLowResPictureLayerImplTest,
+       TileOutsideOfViewportForTilePriorityNotRequired) {
   base::TimeTicks time_ticks;
   time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentBeginFrameArgs(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(400, 400);
   gfx::Rect external_viewport_for_tile_priority(400, 200);
   gfx::Rect visible_content_rect(200, 400);
 
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-  SetupTrees(pending_pile, active_pile);
+  SetupTreesWithFixedTileSize(pending_pile, active_pile, tile_size, Region());
 
-  active_layer_->set_fixed_tile_size(tile_size);
-  pending_layer_->set_fixed_tile_size(tile_size);
-  ASSERT_TRUE(pending_layer_->CanHaveTilings());
-  PictureLayerTiling* tiling = pending_layer_->AddTiling(1.f);
+  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;
   bool resourceless_software_draw = false;
   host_impl_.SetExternalDrawConstraints(transform,
                                         viewport,
                                         viewport,
                                         external_viewport_for_tile_priority,
                                         transform_for_tile_priority,
                                         resourceless_software_draw);
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
+  host_impl_.SetCurrentBeginFrameArgs(
+      CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
   host_impl_.pending_tree()->UpdateDrawProperties();
 
   // Set visible content rect that is different from
   // external_viewport_for_tile_priority.
   pending_layer_->draw_properties().visible_content_rect = visible_content_rect;
   time_ticks += base::TimeDelta::FromMilliseconds(200);
   host_impl_.SetCurrentBeginFrameArgs(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
   pending_layer_->UpdateTiles(Occlusion(), resourceless_software_draw);
 
   // Intersect the two rects. Any tile outside should not be required for
   // activation.
   gfx::Rect viewport_for_tile_priority =
       pending_layer_->GetViewportForTilePriorityInContentSpace();
   viewport_for_tile_priority.Intersect(pending_layer_->visible_content_rect());
 
   int num_inside = 0;
   int num_outside = 0;
   for (PictureLayerTiling::CoverageIterator iter(
-           tiling, pending_layer_->contents_scale_x(), gfx::Rect(layer_bounds));
-       iter;
-       ++iter) {
+           pending_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.
       ManagedTileState::DrawInfo& draw_info = tile->draw_info();
       draw_info.SetSolidColorForTesting(SK_ColorRED);
     } else {
       num_outside++;
@@ skipping 23 matching lines @@
 
 TEST_F(PictureLayerImplTest, HighResTileIsComplete) {
   base::TimeTicks time_ticks;
   time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentBeginFrameArgs(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(200, 200);
 
-  host_impl_.SetViewportSize(layer_bounds);
-
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-  SetupPendingTree(pending_pile);
+
+  SetupPendingTreeWithFixedTileSize(pending_pile, tile_size, Region());
   ActivateTree();
 
   // All high res tiles have resources.
-  active_layer_->set_fixed_tile_size(tile_size);
-  host_impl_.active_tree()->UpdateDrawProperties();
   std::vector<Tile*> tiles =
       active_layer_->tilings()->tiling_at(0)->AllTilesForTesting();
   host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(tiles);
 
   scoped_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
   active_layer_->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
   active_layer_->AppendQuads(render_pass.get(), Occlusion(), &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());
 }
 
 TEST_F(PictureLayerImplTest, HighResTileIsIncomplete) {
   base::TimeTicks time_ticks;
   time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentBeginFrameArgs(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(200, 200);
 
-  host_impl_.SetViewportSize(layer_bounds);
-
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-  SetupPendingTree(pending_pile);
+  SetupPendingTreeWithFixedTileSize(pending_pile, tile_size, Region());
   ActivateTree();
 
-  active_layer_->set_fixed_tile_size(tile_size);
-  host_impl_.active_tree()->UpdateDrawProperties();
-
   scoped_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
   active_layer_->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
   active_layer_->AppendQuads(render_pass.get(), Occlusion(), &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());
 }
 
 TEST_F(PictureLayerImplTest, HighResTileIsIncompleteLowResComplete) {
   base::TimeTicks time_ticks;
   time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentBeginFrameArgs(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(200, 200);
 
-  host_impl_.SetViewportSize(layer_bounds);
-
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-  SetupPendingTree(pending_pile);
+  SetupPendingTreeWithFixedTileSize(pending_pile, tile_size, Region());
   ActivateTree();
 
-  active_layer_->set_fixed_tile_size(tile_size);
-  host_impl_.active_tree()->UpdateDrawProperties();
   std::vector<Tile*> low_tiles =
       active_layer_->tilings()->tiling_at(1)->AllTilesForTesting();
   host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(low_tiles);
 
   scoped_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
   active_layer_->WillDraw(DRAW_MODE_SOFTWARE, nullptr);
   active_layer_->AppendQuads(render_pass.get(), Occlusion(), &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());
 }
 
 TEST_F(PictureLayerImplTest, LowResTileIsIncomplete) {
   base::TimeTicks time_ticks;
   time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentBeginFrameArgs(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(200, 200);
 
-  host_impl_.SetViewportSize(layer_bounds);
-
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-  SetupPendingTree(pending_pile);
+  SetupPendingTreeWithFixedTileSize(pending_pile, tile_size, Region());
   ActivateTree();
 
   // All high res tiles have resources except one.
-  active_layer_->set_fixed_tile_size(tile_size);
-  host_impl_.active_tree()->UpdateDrawProperties();
   std::vector<Tile*> high_tiles =
       active_layer_->tilings()->tiling_at(0)->AllTilesForTesting();
   high_tiles.erase(high_tiles.begin());
   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);
 
@@ skipping 12 matching lines @@
 
 TEST_F(PictureLayerImplTest,
        HighResAndIdealResTileIsCompleteWhenRasterScaleIsNotIdeal) {
   base::TimeTicks time_ticks;
   time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentBeginFrameArgs(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(200, 200);
+  gfx::Size viewport_size(400, 400);
 
-  host_impl_.SetViewportSize(layer_bounds);
+  host_impl_.SetViewportSize(viewport_size);
+  host_impl_.SetDeviceScaleFactor(2.f);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-  SetupTrees(pending_pile, active_pile);
-
-  active_layer_->set_fixed_tile_size(tile_size);
-
-  active_layer_->draw_properties().visible_content_rect =
-      gfx::Rect(layer_bounds);
-  SetupDrawPropertiesAndUpdateTiles(active_layer_, 2.f, 1.f, 1.f, 1.f, false);
+  SetupTreesWithFixedTileSize(pending_pile, active_pile, 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(
       ideal_tiles);
 
   // Due to layer scale throttling, the raster contents scale is changed to 1,
   // while the ideal is still 2.
@@ skipping 31 matching lines @@
   // 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());
 }
 
 TEST_F(PictureLayerImplTest, HighResRequiredWhenUnsharedActiveAllReady) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
 
-  host_impl_.SetViewportSize(layer_bounds);
-
-  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size);
-
   // No tiles shared.
-  pending_layer_->set_invalidation(gfx::Rect(layer_bounds));
-
-  CreateHighLowResAndSetAllTilesVisible();
+  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size,
+                                     gfx::Rect(layer_bounds));
 
   active_layer_->SetAllTilesReady();
 
   // No shared tiles and all active tiles ready, so pending can only
   // activate with all high res tiles.
   pending_layer_->HighResTiling()->UpdateAllTilePrioritiesForTesting();
   pending_layer_->LowResTiling()->UpdateAllTilePrioritiesForTesting();
 
   AssertAllTilesRequired(pending_layer_->HighResTiling());
   AssertNoTilesRequired(pending_layer_->LowResTiling());
 }
 
 TEST_F(PictureLayerImplTest, HighResRequiredWhenMissingHighResFlagOn) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
 
-  host_impl_.SetViewportSize(layer_bounds);
-
-  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size);
-
   // All tiles shared (no invalidation).
-  CreateHighLowResAndSetAllTilesVisible();
+  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, Region());
 
   // Verify active tree not ready.
   Tile* some_active_tile =
       active_layer_->HighResTiling()->AllTilesForTesting()[0];
   EXPECT_FALSE(some_active_tile->IsReadyToDraw());
 
   // When high res are required, even if the active tree is not ready,
   // the high res tiles must be ready.
   host_impl_.SetRequiresHighResToDraw();
 
   pending_layer_->HighResTiling()->UpdateAllTilePrioritiesForTesting();
   pending_layer_->LowResTiling()->UpdateAllTilePrioritiesForTesting();
 
   AssertAllTilesRequired(pending_layer_->HighResTiling());
   AssertNoTilesRequired(pending_layer_->LowResTiling());
 }
 
 TEST_F(PictureLayerImplTest, AllHighResRequiredEvenIfShared) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
 
-  host_impl_.SetViewportSize(layer_bounds);
-
-  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size);
-
-  CreateHighLowResAndSetAllTilesVisible();
+  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, Region());
 
   Tile* some_active_tile =
       active_layer_->HighResTiling()->AllTilesForTesting()[0];
   EXPECT_FALSE(some_active_tile->IsReadyToDraw());
 
   // All tiles shared (no invalidation), so even though the active tree's
   // tiles aren't ready, the high res tiles are required for activation.
   pending_layer_->HighResTiling()->UpdateAllTilePrioritiesForTesting();
   pending_layer_->LowResTiling()->UpdateAllTilePrioritiesForTesting();
 
   AssertAllTilesRequired(pending_layer_->HighResTiling());
   AssertNoTilesRequired(pending_layer_->LowResTiling());
 }
 
 TEST_F(PictureLayerImplTest, DisallowRequiredForActivation) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
-  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size);
 
-  CreateHighLowResAndSetAllTilesVisible();
+  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, Region());
 
   Tile* some_active_tile =
       active_layer_->HighResTiling()->AllTilesForTesting()[0];
   EXPECT_FALSE(some_active_tile->IsReadyToDraw());
 
   pending_layer_->HighResTiling()->set_can_require_tiles_for_activation(false);
   pending_layer_->LowResTiling()->set_can_require_tiles_for_activation(false);
 
   // If we disallow required for activation, no tiles can be required.
   pending_layer_->HighResTiling()->UpdateAllTilePrioritiesForTesting();
   pending_layer_->LowResTiling()->UpdateAllTilePrioritiesForTesting();
 
   AssertNoTilesRequired(pending_layer_->HighResTiling());
   AssertNoTilesRequired(pending_layer_->LowResTiling());
 }
 
 TEST_F(PictureLayerImplTest, NothingRequiredIfActiveMissingTiles) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
+
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   // This pile 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<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateEmptyPileThatThinksItHasRecordings(
           tile_size, layer_bounds);
-  SetupTrees(pending_pile, active_pile);
-  pending_layer_->set_fixed_tile_size(tile_size);
-  active_layer_->set_fixed_tile_size(tile_size);
 
-  CreateHighLowResAndSetAllTilesVisible();
+  SetupTreesWithFixedTileSize(pending_pile, active_pile, 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);
 
   // Since the active layer has no tiles at all, the pending layer doesn't
   // need content in order to activate.
   pending_layer_->HighResTiling()->UpdateAllTilePrioritiesForTesting();
   pending_layer_->LowResTiling()->UpdateAllTilePrioritiesForTesting();
 
   AssertNoTilesRequired(pending_layer_->HighResTiling());
   AssertNoTilesRequired(pending_layer_->LowResTiling());
 }
 
 TEST_F(PictureLayerImplTest, HighResRequiredIfActiveCantHaveTiles) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
 
-  host_impl_.SetViewportSize(layer_bounds);
-
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateEmptyPile(tile_size, layer_bounds);
-  SetupTrees(pending_pile, active_pile);
-  pending_layer_->set_fixed_tile_size(tile_size);
-  active_layer_->set_fixed_tile_size(tile_size);
-
-  CreateHighLowResAndSetAllTilesVisible();
+  SetupTreesWithFixedTileSize(pending_pile, active_pile, tile_size, Region());
 
   // Active layer can't have tiles.
   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()->UpdateAllTilePrioritiesForTesting();
   pending_layer_->LowResTiling()->UpdateAllTilePrioritiesForTesting();
 
   AssertAllTilesRequired(pending_layer_->HighResTiling());
   AssertNoTilesRequired(pending_layer_->LowResTiling());
 }
 
 TEST_F(PictureLayerImplTest, HighResRequiredWhenActiveHasDifferentBounds) {
-  gfx::Size layer_bounds(200, 200);
+  gfx::Size pending_layer_bounds(400, 400);
+  gfx::Size active_layer_bounds(200, 200);
   gfx::Size tile_size(100, 100);
-  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size);
 
-  gfx::Size pending_layer_bounds(400, 400);
-  pending_layer_->SetBounds(pending_layer_bounds);
+  scoped_refptr<FakePicturePileImpl> pending_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, pending_layer_bounds);
+  scoped_refptr<FakePicturePileImpl> active_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, active_layer_bounds);
 
-  CreateHighLowResAndSetAllTilesVisible();
-  // TODO(vmpstr): This is confusing. Rework the test to create different bounds
-  // on different trees instead of fudging tilings.
-  pending_layer_->HighResTiling()->ComputeTilePriorityRects(
-      gfx::Rect(pending_layer_bounds), 1.f, 1.f, Occlusion());
-
-  pending_layer_->HighResTiling()->UpdateAllTilePrioritiesForTesting();
-  active_layer_->SetAllTilesReady();
+  SetupTreesWithFixedTileSize(pending_pile, active_pile, 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()->UpdateAllTilePrioritiesForTesting();
   pending_layer_->LowResTiling()->UpdateAllTilePrioritiesForTesting();
 
   AssertAllTilesRequired(pending_layer_->HighResTiling());
   AssertNoTilesRequired(pending_layer_->LowResTiling());
 }
 
@@ skipping 27 matching lines @@
 
   active_layer_ = static_cast<FakePictureLayerImpl*>(
       host_impl_.active_tree()->LayerById(id_));
 
   EXPECT_EQ(0u, active_layer_->num_tilings());
   EXPECT_EQ(raster_page_scale, active_layer_->raster_page_scale());
   EXPECT_FALSE(active_layer_->needs_post_commit_initialization());
 }
 
 TEST_F(PictureLayerImplTest, ShareTilesOnNextFrame) {
-  SetupDefaultTrees(gfx::Size(1500, 1500));
+  gfx::Size layer_bounds(1500, 1500);
+  gfx::Size tile_size(100, 100);
 
-  PictureLayerTiling* tiling = pending_layer_->AddTiling(1.f);
+  scoped_refptr<FakePicturePileImpl> pending_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+
+  SetupPendingTree(pending_pile);
+
+  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.
-  tiling->CreateAllTilesForTesting();
-  pending_layer_->set_invalidation(first_invalidate);
+  SetupPendingTreeWithInvalidation(pending_pile, first_invalidate);
 
   // Activate and make a pending tree with an invalidated raster tile 1,1.
   ActivateTree();
 
-  host_impl_.CreatePendingTree();
-  pending_layer_ = static_cast<FakePictureLayerImpl*>(
-      host_impl_.pending_tree()->root_layer());
-  pending_layer_->set_invalidation(second_invalidate);
+  SetupPendingTreeWithInvalidation(pending_pile, second_invalidate);
 
   PictureLayerTiling* pending_tiling = pending_layer_->tilings()->tiling_at(0);
   PictureLayerTiling* active_tiling = active_layer_->tilings()->tiling_at(0);
 
-  pending_tiling->CreateAllTilesForTesting();
+  // pending_tiling->CreateAllTilesForTesting();
 
   // Tile 0,0 should be shared, but tile 1,1 should not be.
   EXPECT_EQ(active_tiling->TileAt(0, 0), pending_tiling->TileAt(0, 0));
   EXPECT_EQ(active_tiling->TileAt(1, 0), pending_tiling->TileAt(1, 0));
   EXPECT_EQ(active_tiling->TileAt(0, 1), pending_tiling->TileAt(0, 1));
   EXPECT_NE(active_tiling->TileAt(1, 1), pending_tiling->TileAt(1, 1));
   EXPECT_TRUE(pending_tiling->TileAt(0, 0)->is_shared());
   EXPECT_TRUE(pending_tiling->TileAt(1, 0)->is_shared());
   EXPECT_TRUE(pending_tiling->TileAt(0, 1)->is_shared());
   EXPECT_FALSE(pending_tiling->TileAt(1, 1)->is_shared());
 
   // Drop the tiles on the active tree and recreate them. The same tiles
   // should be shared or not.
   active_tiling->ComputeTilePriorityRects(gfx::Rect(), 1.f, 1.0, Occlusion());
   EXPECT_TRUE(active_tiling->AllTilesForTesting().empty());
   active_tiling->CreateAllTilesForTesting();
 
   // Tile 0,0 should be shared, but tile 1,1 should not be.
   EXPECT_EQ(active_tiling->TileAt(0, 0), pending_tiling->TileAt(0, 0));
   EXPECT_EQ(active_tiling->TileAt(1, 0), pending_tiling->TileAt(1, 0));
   EXPECT_EQ(active_tiling->TileAt(0, 1), pending_tiling->TileAt(0, 1));
   EXPECT_NE(active_tiling->TileAt(1, 1), pending_tiling->TileAt(1, 1));
   EXPECT_TRUE(pending_tiling->TileAt(0, 0)->is_shared());
   EXPECT_TRUE(pending_tiling->TileAt(1, 0)->is_shared());
   EXPECT_TRUE(pending_tiling->TileAt(0, 1)->is_shared());
   EXPECT_FALSE(pending_tiling->TileAt(1, 1)->is_shared());
 }
 
-TEST_F(PictureLayerImplTest, ShareTilesOnSync) {
+TEST_F(PictureLayerImplTest, ShareTilesWithNoInvalidation) {
   SetupDefaultTrees(gfx::Size(1500, 1500));
-  AddDefaultTilingsWithInvalidation(gfx::Rect());
 
-  host_impl_.ActivateSyncTree();
-  host_impl_.CreatePendingTree();
-  active_layer_ = static_cast<FakePictureLayerImpl*>(
-      host_impl_.active_tree()->LayerById(id_));
+  EXPECT_GE(active_layer_->num_tilings(), 1u);
+  EXPECT_GE(pending_layer_->num_tilings(), 1u);
 
-  // Force the active tree to sync to the pending tree "post-commit".
-  pending_layer_->DoPostCommitInitializationIfNeeded();
+  // No invalidation, so all tiles are shared.
+  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);
 
-  // Both invalidations should drop tiles from the pending tree.
-  EXPECT_EQ(3u, active_layer_->num_tilings());
-  EXPECT_EQ(3u, pending_layer_->num_tilings());
-  for (size_t i = 0; i < active_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* active_tiling = active_layer_->tilings()->tiling_at(i);
-    PictureLayerTiling* pending_tiling =
-        pending_layer_->tilings()->tiling_at(i);
+  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));
 
-    ASSERT_TRUE(active_tiling);
-    ASSERT_TRUE(pending_tiling);
+  EXPECT_TRUE(pending_tiling->TileAt(0, 0));
+  EXPECT_TRUE(pending_tiling->TileAt(1, 0));
+  EXPECT_TRUE(pending_tiling->TileAt(0, 1));
+  EXPECT_TRUE(pending_tiling->TileAt(1, 1));
 
-    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_TRUE(pending_tiling->TileAt(1, 0));
-    EXPECT_TRUE(pending_tiling->TileAt(0, 1));
-    EXPECT_TRUE(pending_tiling->TileAt(1, 1));
-
-    EXPECT_EQ(active_tiling->TileAt(0, 0), pending_tiling->TileAt(0, 0));
-    EXPECT_TRUE(active_tiling->TileAt(0, 0)->is_shared());
-    EXPECT_EQ(active_tiling->TileAt(1, 0), pending_tiling->TileAt(1, 0));
-    EXPECT_TRUE(active_tiling->TileAt(1, 0)->is_shared());
-    EXPECT_EQ(active_tiling->TileAt(0, 1), pending_tiling->TileAt(0, 1));
-    EXPECT_TRUE(active_tiling->TileAt(0, 1)->is_shared());
-    EXPECT_EQ(active_tiling->TileAt(1, 1), pending_tiling->TileAt(1, 1));
-    EXPECT_TRUE(active_tiling->TileAt(1, 1)->is_shared());
-  }
+  EXPECT_EQ(active_tiling->TileAt(0, 0), pending_tiling->TileAt(0, 0));
+  EXPECT_TRUE(active_tiling->TileAt(0, 0)->is_shared());
+  EXPECT_EQ(active_tiling->TileAt(1, 0), pending_tiling->TileAt(1, 0));
+  EXPECT_TRUE(active_tiling->TileAt(1, 0)->is_shared());
+  EXPECT_EQ(active_tiling->TileAt(0, 1), pending_tiling->TileAt(0, 1));
+  EXPECT_TRUE(active_tiling->TileAt(0, 1)->is_shared());
+  EXPECT_EQ(active_tiling->TileAt(1, 1), pending_tiling->TileAt(1, 1));
+  EXPECT_TRUE(active_tiling->TileAt(1, 1)->is_shared());
 }
 
-TEST_F(PictureLayerImplTest, ShareInvalidActiveTreeTilesOnSync) {
-  SetupDefaultTrees(gfx::Size(1500, 1500));
-  AddDefaultTilingsWithInvalidation(gfx::Rect(0, 0, 1, 1));
+TEST_F(PictureLayerImplTest, ShareInvalidActiveTreeTiles) {
+  gfx::Size tile_size(100, 100);
+  gfx::Size layer_bounds(1500, 1500);
 
-  // This activates the 0,0,1,1 invalidation.
-  host_impl_.ActivateSyncTree();
-  host_impl_.CreatePendingTree();
-  active_layer_ = static_cast<FakePictureLayerImpl*>(
-      host_impl_.active_tree()->LayerById(id_));
+  scoped_refptr<FakePicturePileImpl> pending_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+  scoped_refptr<FakePicturePileImpl> active_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+  SetupTreesWithInvalidation(pending_pile, active_pile, gfx::Rect(1, 1));
+  // Activate the invalidation.
+  ActivateTree();
+  // Make another pending tree without any invalidation in it.
+  scoped_refptr<FakePicturePileImpl> pending_pile2 =
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+  SetupPendingTree(pending_pile2);
 
-  // Force the active tree to sync to the pending tree "post-commit".
-  pending_layer_->DoPostCommitInitializationIfNeeded();
+  EXPECT_GE(active_layer_->num_tilings(), 1u);
+  EXPECT_GE(pending_layer_->num_tilings(), 1u);
 
   // The active tree invalidation was handled by the active tiles, so they
   // can be shared with the pending tree.
-  EXPECT_EQ(3u, active_layer_->num_tilings());
-  EXPECT_EQ(3u, pending_layer_->num_tilings());
-  for (size_t i = 0; i < active_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* active_tiling = active_layer_->tilings()->tiling_at(i);
-    PictureLayerTiling* pending_tiling =
-        pending_layer_->tilings()->tiling_at(i);
+  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);
 
-    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(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_TRUE(pending_tiling->TileAt(1, 0));
+  EXPECT_TRUE(pending_tiling->TileAt(0, 1));
+  EXPECT_TRUE(pending_tiling->TileAt(1, 1));
 
-    EXPECT_TRUE(pending_tiling->TileAt(0, 0));
-    EXPECT_TRUE(pending_tiling->TileAt(1, 0));
-    EXPECT_TRUE(pending_tiling->TileAt(0, 1));
-    EXPECT_TRUE(pending_tiling->TileAt(1, 1));
-
-    EXPECT_EQ(active_tiling->TileAt(0, 0), pending_tiling->TileAt(0, 0));
-    EXPECT_TRUE(active_tiling->TileAt(0, 0)->is_shared());
-    EXPECT_EQ(active_tiling->TileAt(1, 0), pending_tiling->TileAt(1, 0));
-    EXPECT_TRUE(active_tiling->TileAt(1, 0)->is_shared());
-    EXPECT_EQ(active_tiling->TileAt(0, 1), pending_tiling->TileAt(0, 1));
-    EXPECT_TRUE(active_tiling->TileAt(0, 1)->is_shared());
-    EXPECT_EQ(active_tiling->TileAt(1, 1), pending_tiling->TileAt(1, 1));
-    EXPECT_TRUE(active_tiling->TileAt(1, 1)->is_shared());
-  }
+  EXPECT_EQ(active_tiling->TileAt(0, 0), pending_tiling->TileAt(0, 0));
+  EXPECT_TRUE(active_tiling->TileAt(0, 0)->is_shared());
+  EXPECT_EQ(active_tiling->TileAt(1, 0), pending_tiling->TileAt(1, 0));
+  EXPECT_TRUE(active_tiling->TileAt(1, 0)->is_shared());
+  EXPECT_EQ(active_tiling->TileAt(0, 1), pending_tiling->TileAt(0, 1));
+  EXPECT_TRUE(active_tiling->TileAt(0, 1)->is_shared());
+  EXPECT_EQ(active_tiling->TileAt(1, 1), pending_tiling->TileAt(1, 1));
+  EXPECT_TRUE(active_tiling->TileAt(1, 1)->is_shared());
 }
 
-TEST_F(PictureLayerImplTest, RemoveInvalidPendingTreeTilesOnSync) {
-  SetupDefaultTrees(gfx::Size(1500, 1500));
-  AddDefaultTilingsWithInvalidation(gfx::Rect());
+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));
 
-  host_impl_.ActivateSyncTree();
-  host_impl_.CreatePendingTree();
-  active_layer_ = static_cast<FakePictureLayerImpl*>(
-      host_impl_.active_tree()->LayerById(id_));
-
-  // Set some invalidation on the pending tree "during commit". We should
-  // replace raster tiles that touch this.
-  pending_layer_->set_invalidation(gfx::Rect(1, 1));
-
-  // Force the active tree to sync to the pending tree "post-commit".
-  pending_layer_->DoPostCommitInitializationIfNeeded();
+  EXPECT_GE(active_layer_->num_tilings(), 1u);
+  EXPECT_GE(pending_layer_->num_tilings(), 1u);
 
   // The pending tree invalidation means tiles can not be shared with the
   // active tree.
-  EXPECT_EQ(3u, active_layer_->num_tilings());
-  EXPECT_EQ(3u, pending_layer_->num_tilings());
-  for (size_t i = 0; i < active_layer_->num_tilings(); ++i) {
-    PictureLayerTiling* active_tiling = active_layer_->tilings()->tiling_at(i);
-    PictureLayerTiling* pending_tiling =
-        pending_layer_->tilings()->tiling_at(i);
+  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);
 
-    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(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_TRUE(pending_tiling->TileAt(1, 0));
+  EXPECT_TRUE(pending_tiling->TileAt(0, 1));
+  EXPECT_TRUE(pending_tiling->TileAt(1, 1));
 
-    EXPECT_TRUE(pending_tiling->TileAt(0, 0));
-    EXPECT_TRUE(pending_tiling->TileAt(1, 0));
-    EXPECT_TRUE(pending_tiling->TileAt(0, 1));
-    EXPECT_TRUE(pending_tiling->TileAt(1, 1));
-
-    EXPECT_NE(active_tiling->TileAt(0, 0), pending_tiling->TileAt(0, 0));
-    EXPECT_FALSE(active_tiling->TileAt(0, 0)->is_shared());
-    EXPECT_FALSE(pending_tiling->TileAt(0, 0)->is_shared());
-    EXPECT_EQ(active_tiling->TileAt(1, 0), pending_tiling->TileAt(1, 0));
-    EXPECT_TRUE(active_tiling->TileAt(1, 0)->is_shared());
-    EXPECT_EQ(active_tiling->TileAt(0, 1), pending_tiling->TileAt(0, 1));
-    EXPECT_TRUE(active_tiling->TileAt(1, 1)->is_shared());
-    EXPECT_EQ(active_tiling->TileAt(1, 1), pending_tiling->TileAt(1, 1));
-    EXPECT_TRUE(active_tiling->TileAt(1, 1)->is_shared());
-  }
-}
-
-TEST_F(PictureLayerImplTest, SyncTilingAfterReleaseResource) {
-  SetupDefaultTrees(gfx::Size(10, 10));
-  host_impl_.active_tree()->UpdateDrawProperties();
-  EXPECT_FALSE(host_impl_.active_tree()->needs_update_draw_properties());
-
-  // Contrived unit test of a real crash. A layer is transparent during a
-  // context loss, and later becomes opaque, causing active layer SyncTiling to
-  // be called.
-  float new_scale = 1.f;
-  active_layer_->ReleaseResources();
-  pending_layer_->ReleaseResources();
-  EXPECT_FALSE(active_layer_->tilings()->FindTilingWithScale(new_scale));
-  pending_layer_->AddTiling(new_scale);
-  EXPECT_TRUE(active_layer_->tilings()->FindTilingWithScale(new_scale));
-
-  // UpdateDrawProperties early-outs if the tree doesn't need it.  It is also
-  // responsible for calling ManageTilings.  These checks verify that
-  // ReleaseResources has set needs update draw properties so that the
-  // new tiling gets the appropriate resolution set in ManageTilings.
-  EXPECT_TRUE(host_impl_.active_tree()->needs_update_draw_properties());
-  host_impl_.active_tree()->UpdateDrawProperties();
-  PictureLayerTiling* high_res =
-      active_layer_->tilings()->FindTilingWithScale(new_scale);
-  ASSERT_TRUE(!!high_res);
-  EXPECT_EQ(HIGH_RESOLUTION, high_res->resolution());
+  EXPECT_NE(active_tiling->TileAt(0, 0), pending_tiling->TileAt(0, 0));
+  EXPECT_FALSE(active_tiling->TileAt(0, 0)->is_shared());
+  EXPECT_FALSE(pending_tiling->TileAt(0, 0)->is_shared());
+  EXPECT_EQ(active_tiling->TileAt(1, 0), pending_tiling->TileAt(1, 0));
+  EXPECT_TRUE(active_tiling->TileAt(1, 0)->is_shared());
+  EXPECT_EQ(active_tiling->TileAt(0, 1), pending_tiling->TileAt(0, 1));
+  EXPECT_TRUE(active_tiling->TileAt(1, 1)->is_shared());
+  EXPECT_EQ(active_tiling->TileAt(1, 1), pending_tiling->TileAt(1, 1));
+  EXPECT_TRUE(active_tiling->TileAt(1, 1)->is_shared());
 }
 
 TEST_F(PictureLayerImplTest, SyncTilingAfterGpuRasterizationToggles) {
-  SetupDefaultTrees(gfx::Size(10, 10));
+  base::TimeTicks time_ticks;
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
+  host_impl_.SetCurrentBeginFrameArgs(
+      CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
 
-  const float kScale = 1.f;
-  pending_layer_->AddTiling(kScale);
-  EXPECT_TRUE(pending_layer_->tilings()->FindTilingWithScale(kScale));
-  EXPECT_TRUE(active_layer_->tilings()->FindTilingWithScale(kScale));
+  gfx::Size tile_size(100, 100);
+  gfx::Size layer_bounds(10, 10);
+
+  scoped_refptr<FakePicturePileImpl> pending_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+  scoped_refptr<FakePicturePileImpl> active_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+
+  SetupTrees(pending_pile, active_pile);
+
+  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());
   // Toggling the gpu rasterization clears all tilings on both trees.
   host_impl_.SetUseGpuRasterization(true);
   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.
-  pending_layer_->AddTiling(kScale);
-  EXPECT_TRUE(pending_layer_->tilings()->FindTilingWithScale(kScale));
-  EXPECT_TRUE(active_layer_->tilings()->FindTilingWithScale(kScale));
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
+  host_impl_.SetCurrentBeginFrameArgs(
+      CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
+  host_impl_.pending_tree()->UpdateDrawProperties();
+  EXPECT_TRUE(pending_layer_->tilings()->FindTilingWithScale(1.f));
+
+  ActivateTree();
+  EXPECT_TRUE(active_layer_->tilings()->FindTilingWithScale(1.f));
+
+  SetupPendingTree(pending_pile);
+  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_.SetUseGpuRasterization(false);
   EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
   EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, HighResCreatedWhenBoundsShrink) {
   gfx::Size tile_size(100, 100);
 
-  scoped_refptr<FakePicturePileImpl> active_pile =
+  // Put 0.5 as high res.
+  host_impl_.SetDeviceScaleFactor(0.5f);
+
+  scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, gfx::Size(10, 10));
-  SetupPendingTree(active_pile);
-  ActivateTree();
-  host_impl_.active_tree()->UpdateDrawProperties();
-  EXPECT_FALSE(host_impl_.active_tree()->needs_update_draw_properties());
-
-  SetupDrawPropertiesAndUpdateTiles(
-      active_layer_, 0.5f, 0.5f, 0.5f, 0.5f, false);
-  active_layer_->tilings()->RemoveAllTilings();
-  PictureLayerTiling* tiling = active_layer_->AddTiling(0.5f);
-  active_layer_->AddTiling(1.5f);
-  active_layer_->AddTiling(0.25f);
-  tiling->set_resolution(HIGH_RESOLUTION);
+  SetupPendingTree(pending_pile);
 
   // Sanity checks.
-  ASSERT_EQ(3u, active_layer_->tilings()->num_tilings());
-  ASSERT_EQ(tiling, active_layer_->tilings()->FindTilingWithScale(0.5f));
+  EXPECT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  EXPECT_TRUE(pending_layer_->tilings()->FindTilingWithScale(0.5f));
 
-  // Now, set the bounds to be 1x1 (so that minimum contents scale becomes
-  // 1.0f). Note that we should also ensure that the pending layer needs post
-  // commit initialization, since this is what would happen during commit. In
-  // other words we want the pending layer to sync from the active layer.
-  scoped_refptr<FakePicturePileImpl> pending_pile =
+  ActivateTree();
+
+  // Now, set the bounds to be 1x1, so that minimum contents scale becomes 1.
+  pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, gfx::Size(1, 1));
   SetupPendingTree(pending_pile);
 
-  // Update the draw properties: sync from active tree should happen here.
-  host_impl_.pending_tree()->UpdateDrawProperties();
-  EXPECT_FALSE(pending_layer_->needs_post_commit_initialization());
+  // Another sanity check.
+  EXPECT_EQ(1.f, pending_layer_->MinimumContentsScale());
 
-  // Another sanity check.
-  ASSERT_EQ(1.f, pending_layer_->MinimumContentsScale());
+  // Since the MinContentsScale is 1, the 0.5 tiling should be replaced by a 1.0
+  // tiling.
+  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 0.5f, 1.f, 1.f, 1.f, false);
 
-  // Now we should've synced 1.5f tiling, since that's the only one that doesn't
-  // violate minimum contents scale. At the same time, we should've created a
-  // new high res tiling at scale 1.0f.
+  EXPECT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  PictureLayerTiling* tiling =
+      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 layer_bounds(default_tile_size.width() * 4,
+                         default_tile_size.height() * 4);
+
+  host_impl_.SetUseGpuRasterization(false);
+
+  SetupDefaultTrees(layer_bounds);
+  EXPECT_FALSE(host_impl_.use_gpu_rasterization());
+  // Should have a low-res and a high-res tiling.
   EXPECT_EQ(2u, pending_layer_->tilings()->num_tilings());
-  ASSERT_TRUE(pending_layer_->tilings()->FindTilingWithScale(1.0f));
-  EXPECT_EQ(HIGH_RESOLUTION,
-            pending_layer_->tilings()->FindTilingWithScale(1.0f)->resolution());
-  ASSERT_TRUE(pending_layer_->tilings()->FindTilingWithScale(1.5f));
-  EXPECT_EQ(NON_IDEAL_RESOLUTION,
-            pending_layer_->tilings()->FindTilingWithScale(1.5f)->resolution());
 }
 
 TEST_F(PictureLayerImplTest, NoLowResTilingWithGpuRasterization) {
   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_.SetUseGpuRasterization(true);
+
   SetupDefaultTrees(layer_bounds);
-  EXPECT_FALSE(host_impl_.use_gpu_rasterization());
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.f, 1.f, 1.f, 1.f, false);
-  // Should have a low-res and a high-res tiling.
-  ASSERT_EQ(2u, pending_layer_->tilings()->num_tilings());
-
-  ResetTilingsAndRasterScales();
-
-  host_impl_.SetUseGpuRasterization(true);
   EXPECT_TRUE(host_impl_.use_gpu_rasterization());
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 1.f, 1.f, 1.f, 1.f, false);
-
   // Should only have the high-res tiling.
-  ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
+  EXPECT_EQ(1u, pending_layer_->tilings()->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, NoTilingIfDoesNotDrawContent) {
   // Set up layers with tilings.
   SetupDefaultTrees(gfx::Size(10, 10));
   SetContentsScaleOnBothLayers(1.f, 1.f, 1.f, 1.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);
 
   // Set content to false, which should make CanHaveTilings return false.
   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());
 }
 
 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());
+
+  // When we scale up by 2.3, we get a new tiling that is a power of 2, in this
+  // case 4.
   host_impl_.PinchGestureBegin();
   float high_res_scale = 2.3f;
   SetContentsScaleOnBothLayers(high_res_scale, 1.f, 1.f, 1.f, false);
-
-  ASSERT_GE(pending_layer_->num_tilings(), 0u);
-  EXPECT_FLOAT_EQ(high_res_scale,
-                  pending_layer_->HighResTiling()->contents_scale());
-}
-
-TEST_F(PictureLayerImplTest, FirstTilingTooSmall) {
-  SetupDefaultTrees(gfx::Size(10, 10));
-  host_impl_.PinchGestureBegin();
-  float high_res_scale = 0.0001f;
-  EXPECT_GT(pending_layer_->MinimumContentsScale(), high_res_scale);
-
-  SetContentsScaleOnBothLayers(high_res_scale, 1.f, 1.f, 1.f, false);
-
-  ASSERT_GE(pending_layer_->num_tilings(), 0u);
-  EXPECT_FLOAT_EQ(pending_layer_->MinimumContentsScale(),
-                  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());
+
+  host_impl_.PinchGestureBegin();
+  float high_res_scale = 0.0001f;
+  EXPECT_LT(high_res_scale, pending_layer_->MinimumContentsScale());
+
+  SetContentsScaleOnBothLayers(high_res_scale, 1.f, high_res_scale, 1.f, false);
+  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, false);
 
   ASSERT_GE(pending_layer_->num_tilings(), 0u);
   EXPECT_FLOAT_EQ(contents_scale,
                   pending_layer_->HighResTiling()->contents_scale());
 
   host_impl_.PinchGestureBegin();
 
   float page_scale = 0.0001f;
@@ skipping 47 matching lines @@
   ASSERT_TRUE(fake_output_surface->InitializeAndSetContext3d(
       TestContextProvider::Create()));
 
   // These will crash PictureLayerImpl if this is not true.
   ASSERT_TRUE(host_impl_.pending_tree()->needs_update_draw_properties());
   ASSERT_TRUE(host_impl_.active_tree()->needs_update_draw_properties());
   host_impl_.active_tree()->UpdateDrawProperties();
 }
 
 TEST_F(PictureLayerImplTest, HighResTilingDuringAnimationForCpuRasterization) {
-  gfx::Size layer_bounds(100, 100);
   gfx::Size viewport_size(1000, 1000);
-  SetupDefaultTrees(layer_bounds);
   host_impl_.SetViewportSize(viewport_size);
 
+  gfx::Size layer_bounds(100, 100);
+  SetupDefaultTrees(layer_bounds);
+
   float contents_scale = 1.f;
-  float device_scale = 1.3f;
-  float page_scale = 1.4f;
+  float device_scale = 1.f;
+  float page_scale = 1.f;
   float maximum_animation_scale = 1.f;
   bool animating_transform = false;
 
-  SetContentsScaleOnBothLayers(contents_scale,
-                               device_scale,
-                               page_scale,
-                               maximum_animation_scale,
-                               animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 1.f);
 
   // Since we're CPU-rasterizing, starting an animation should cause tiling
   // resolution to get set to the maximum animation scale factor.
   animating_transform = true;
   maximum_animation_scale = 3.f;
   contents_scale = 2.f;
 
   SetContentsScaleOnBothLayers(contents_scale,
                                device_scale,
@@ skipping 203 matching lines @@
                                animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 4.f);
 }
 
 TEST_F(PictureLayerImplTest, TilingSetRasterQueue) {
   base::TimeTicks time_ticks;
   time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentBeginFrameArgs(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
 
+  host_impl_.SetViewportSize(gfx::Size(500, 500));
+
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(1000, 1000);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
   SetupPendingTree(pending_pile);
+  EXPECT_EQ(2u, pending_layer_->num_tilings());
 
-  ASSERT_TRUE(pending_layer_->CanHaveTilings());
-
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
-
-  // No tilings.
   scoped_ptr<TilingSetRasterQueue> queue =
       pending_layer_->CreateRasterQueue(false);
-  EXPECT_TRUE(queue->IsEmpty());
-
-  pending_layer_->AddTiling(low_res_factor);
-  pending_layer_->AddTiling(0.3f);
-  pending_layer_->AddTiling(0.7f);
-  PictureLayerTiling* high_res_tiling = pending_layer_->AddTiling(1.0f);
-  pending_layer_->AddTiling(2.0f);
-
-  host_impl_.SetViewportSize(gfx::Size(500, 500));
-  host_impl_.pending_tree()->UpdateDrawProperties();
 
   std::set<Tile*> unique_tiles;
   bool reached_prepaint = false;
   size_t non_ideal_tile_count = 0u;
   size_t low_res_tile_count = 0u;
   size_t high_res_tile_count = 0u;
   queue = pending_layer_->CreateRasterQueue(false);
   while (!queue->IsEmpty()) {
     Tile* tile = queue->Top();
     TilePriority priority = tile->priority(PENDING_TREE);
@@ skipping 57 matching lines @@
   EXPECT_EQ(high_res_tile_count, unique_tiles.size());
 
   time_ticks += base::TimeDelta::FromMilliseconds(200);
   host_impl_.SetCurrentBeginFrameArgs(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
 
   pending_layer_->draw_properties().visible_content_rect =
       gfx::Rect(0, 0, 500, 500);
   pending_layer_->UpdateTiles(Occlusion(), resourceless_software_draw);
 
-  std::vector<Tile*> high_res_tiles = high_res_tiling->AllTilesForTesting();
+  std::vector<Tile*> high_res_tiles =
+      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;
     ManagedTileState::DrawInfo& draw_info = tile->draw_info();
     draw_info.SetSolidColorForTesting(SK_ColorRED);
   }
 
   non_ideal_tile_count = 0;
   low_res_tile_count = 0;
@@ skipping 12 matching lines @@
   }
 
   EXPECT_EQ(0u, non_ideal_tile_count);
   EXPECT_EQ(1u, low_res_tile_count);
   EXPECT_EQ(0u, high_res_tile_count);
 }
 
 TEST_F(PictureLayerImplTest, TilingSetEvictionQueue) {
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(1000, 1000);
+  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+
+  host_impl_.SetViewportSize(gfx::Size(500, 500));
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
+  // TODO(vmpstr): Add a test with tilings other than high/low res on the active
+  // tree.
   SetupPendingTree(pending_pile);
-
-  ASSERT_TRUE(pending_layer_->CanHaveTilings());
-
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
-
-  std::vector<PictureLayerTiling*> tilings;
-  tilings.push_back(pending_layer_->AddTiling(low_res_factor));
-  tilings.push_back(pending_layer_->AddTiling(0.3f));
-  tilings.push_back(pending_layer_->AddTiling(0.7f));
-  tilings.push_back(pending_layer_->AddTiling(1.0f));
-  tilings.push_back(pending_layer_->AddTiling(2.0f));
-
-  host_impl_.SetViewportSize(gfx::Size(500, 500));
-  host_impl_.pending_tree()->UpdateDrawProperties();
+  EXPECT_EQ(2u, pending_layer_->num_tilings());
 
   std::vector<Tile*> all_tiles;
-  for (std::vector<PictureLayerTiling*>::iterator tiling_iterator =
-           tilings.begin();
-       tiling_iterator != tilings.end();
-       ++tiling_iterator) {
-    std::vector<Tile*> tiles = (*tiling_iterator)->AllTilesForTesting();
-    std::copy(tiles.begin(), tiles.end(), std::back_inserter(all_tiles));
+  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 < tilings.size(); ++i) {
-    PictureLayerTiling* tiling = tilings.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,
              pending_layer_->contents_scale_x(),
              pending_layer_->visible_content_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(91u, all_tiles.size());
-  EXPECT_EQ(91u, all_tiles_set.size());
+  EXPECT_EQ(17u, all_tiles.size());
+  EXPECT_EQ(17u, all_tiles_set.size());
   EXPECT_GT(number_of_marked_tiles, 1u);
   EXPECT_GT(number_of_unmarked_tiles, 1u);
 
   // Tiles don't have resources yet.
   scoped_ptr<TilingSetEvictionQueue> queue =
       pending_layer_->CreateEvictionQueue(SAME_PRIORITY_FOR_BOTH_TREES);
   EXPECT_TRUE(queue->IsEmpty());
 
   host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(all_tiles);
 
   std::set<Tile*> unique_tiles;
-  float expected_scales[] = {2.0f, 0.3f, 0.7f, low_res_factor, 1.0f};
+  float expected_scales[] = {low_res_factor, 1.f};
   size_t scale_index = 0;
   bool reached_visible = false;
   Tile* last_tile = nullptr;
   queue = pending_layer_->CreateEvictionQueue(SAME_PRIORITY_FOR_BOTH_TREES);
   while (!queue->IsEmpty()) {
     Tile* tile = queue->Top();
     if (!last_tile)
       last_tile = tile;
 
     EXPECT_TRUE(tile);
@@ skipping 26 matching lines @@
         std::abs(tile->contents_scale() - last_tile->contents_scale()) <
             std::numeric_limits<float>::epsilon()) {
       EXPECT_LE(priority.distance_to_visible,
                 last_tile->priority(PENDING_TREE).distance_to_visible);
     }
 
     last_tile = tile;
     queue->Pop();
   }
 
+  // 4 high res tiles are inside the viewport, the rest are evicted.
   EXPECT_TRUE(reached_visible);
-  EXPECT_EQ(65u, unique_tiles.size());
+  EXPECT_EQ(12u, unique_tiles.size());
 
   scale_index = 0;
   bool reached_required = false;
   while (!queue->IsEmpty()) {
     Tile* tile = queue->Top();
     EXPECT_TRUE(tile);
 
     TilePriority priority = tile->priority(PENDING_TREE);
     EXPECT_EQ(TilePriority::NOW, priority.priority_bin);
 
@@ skipping 18 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);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(layer_bounds, layer_bounds);
-  SetupPendingTree(pending_pile);
-  pending_layer_->SetBounds(layer_bounds);
+  SetupPendingTreeWithFixedTileSize(pending_pile, tile_size, Region());
   ActivateTree();
-  active_layer_->set_fixed_tile_size(tile_size);
-
-  host_impl_.SetViewportSize(viewport_size);
-  host_impl_.active_tree()->UpdateDrawProperties();
 
   std::vector<Tile*> tiles =
       active_layer_->HighResTiling()->AllTilesForTesting();
   host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(tiles);
 
   {
     SCOPED_TRACE("No occlusion");
     gfx::Rect occluded;
     impl.AppendQuadsWithOcclusion(active_layer_, occluded);
 
@@ skipping 22 matching lines @@
     // 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);
   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;
   bool animating_transform = false;
 
   SetContentsScaleOnBothLayers(contents_scale,
                                device_scale,
                                page_scale,
                                maximum_animation_scale,
@@ skipping 20 matching lines @@
                                page_scale,
                                maximum_animation_scale,
                                animating_transform);
   EXPECT_BOTH_EQ(HighResTiling()->contents_scale(), 1.f);
 }
 
 TEST_F(PictureLayerImplTest, LowResReadyToDrawNotEnoughToActivate) {
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(1000, 1000);
 
-  host_impl_.SetViewportSize(layer_bounds);
-
-  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size);
-
   // Make sure some tiles are not shared.
-  pending_layer_->set_invalidation(gfx::Rect(gfx::Point(50, 50), tile_size));
-
-  CreateHighLowResAndSetAllTilesVisible();
-  active_layer_->SetAllTilesReady();
+  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(pending_layer_->AllTilesRequiredForActivationAreReadyToDraw());
 
   // Initialize all low-res tiles.
   pending_layer_->SetAllTilesReadyInTiling(pending_layer_->LowResTiling());
 
   // Low-res tiles should not be enough.
   EXPECT_FALSE(pending_layer_->AllTilesRequiredForActivationAreReadyToDraw());
 
   // Initialize remaining tiles.
   pending_layer_->SetAllTilesReady();
 
   EXPECT_TRUE(pending_layer_->AllTilesRequiredForActivationAreReadyToDraw());
 }
 
 TEST_F(PictureLayerImplTest, HighResReadyToDrawEnoughToActivate) {
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(1000, 1000);
 
-  host_impl_.SetViewportSize(layer_bounds);
-
-  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size);
-
   // Make sure some tiles are not shared.
-  pending_layer_->set_invalidation(gfx::Rect(gfx::Point(50, 50), tile_size));
-
-  CreateHighLowResAndSetAllTilesVisible();
-  active_layer_->SetAllTilesReady();
+  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(pending_layer_->AllTilesRequiredForActivationAreReadyToDraw());
 
   // Initialize all high-res tiles.
   pending_layer_->SetAllTilesReadyInTiling(pending_layer_->HighResTiling());
 
   // High-res tiles should be enough, since they cover everything visible.
   EXPECT_TRUE(pending_layer_->AllTilesRequiredForActivationAreReadyToDraw());
 }
 
 TEST_F(PictureLayerImplTest,
        SharedActiveHighResReadyAndPendingLowResReadyNotEnoughToActivate) {
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(1000, 1000);
 
-  host_impl_.SetViewportSize(layer_bounds);
-
-  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size);
-
   // Make sure some tiles are not shared.
-  pending_layer_->set_invalidation(gfx::Rect(gfx::Point(50, 50), tile_size));
-
-  CreateHighLowResAndSetAllTilesVisible();
+  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());
   // And all the low-res tiles in the pending layer.
   pending_layer_->SetAllTilesReadyInTiling(pending_layer_->LowResTiling());
 
   // The unshared high-res tiles are not ready, so we cannot activate.
   EXPECT_FALSE(pending_layer_->AllTilesRequiredForActivationAreReadyToDraw());
 
   // When the unshared pending high-res tiles are ready, we can activate.
   pending_layer_->SetAllTilesReadyInTiling(pending_layer_->HighResTiling());
   EXPECT_TRUE(pending_layer_->AllTilesRequiredForActivationAreReadyToDraw());
 }
 
 TEST_F(PictureLayerImplTest, SharedActiveHighResReadyNotEnoughToActivate) {
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(1000, 1000);
 
-  host_impl_.SetViewportSize(layer_bounds);
-
-  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size);
-
   // Make sure some tiles are not shared.
-  pending_layer_->set_invalidation(gfx::Rect(gfx::Point(50, 50), tile_size));
-
-  CreateHighLowResAndSetAllTilesVisible();
+  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());
 
   // The unshared high-res tiles are not ready, so we cannot activate.
   EXPECT_FALSE(pending_layer_->AllTilesRequiredForActivationAreReadyToDraw());
 
   // When the unshared pending high-res tiles are ready, we can activate.
   pending_layer_->SetAllTilesReadyInTiling(pending_layer_->HighResTiling());
   EXPECT_TRUE(pending_layer_->AllTilesRequiredForActivationAreReadyToDraw());
 }
 
-class NoLowResPictureLayerImplTest : public PictureLayerImplTest {
- public:
-  NoLowResPictureLayerImplTest()
-      : PictureLayerImplTest(NoLowResTilingsSettings()) {}
-};
-
 TEST_F(NoLowResPictureLayerImplTest, ManageTilingsCreatesTilings) {
   gfx::Size tile_size(400, 400);
   gfx::Size layer_bounds(1300, 1900);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
   SetupTrees(pending_pile, active_pile);
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
 
   float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
   EXPECT_LT(low_res_factor, 1.f);
 
+  ResetTilingsAndRasterScales();
+
+  SetupDrawPropertiesAndUpdateTiles(active_layer_,
+                                    6.f,  // ideal contents scale
+                                    3.f,  // device scale
+                                    2.f,  // page scale
+                                    1.f,  // maximum animation scale
+                                    false);
+  ASSERT_EQ(1u, active_layer_->tilings()->num_tilings());
+  EXPECT_FLOAT_EQ(6.f,
+                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+
+  // If we change the page scale factor, then we should get new tilings.
+  SetupDrawPropertiesAndUpdateTiles(active_layer_,
+                                    6.6f,  // ideal contents scale
+                                    3.f,   // device scale
+                                    2.2f,  // page scale
+                                    1.f,   // maximum animation scale
+                                    false);
+  ASSERT_EQ(2u, active_layer_->tilings()->num_tilings());
+  EXPECT_FLOAT_EQ(6.6f,
+                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+
+  // If we change the device scale factor, then we should get new tilings.
+  SetupDrawPropertiesAndUpdateTiles(active_layer_,
+                                    7.26f,  // ideal contents scale
+                                    3.3f,   // device scale
+                                    2.2f,   // page scale
+                                    1.f,    // maximum animation scale
+                                    false);
+  ASSERT_EQ(3u, active_layer_->tilings()->num_tilings());
+  EXPECT_FLOAT_EQ(7.26f,
+                  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_,
+                                    7.26f,  // ideal contents scale
+                                    2.2f,   // device scale
+                                    3.3f,   // page scale
+                                    1.f,    // maximum animation scale
+                                    false);
+  ASSERT_EQ(3u, active_layer_->tilings()->num_tilings());
+  EXPECT_FLOAT_EQ(7.26f,
+                  active_layer_->tilings()->tiling_at(0)->contents_scale());
+}
+
+TEST_F(NoLowResPictureLayerImplTest, PendingLayerOnlyHasHighResTiling) {
+  gfx::Size tile_size(400, 400);
+  gfx::Size layer_bounds(1300, 1900);
+
+  scoped_refptr<FakePicturePileImpl> pending_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+  scoped_refptr<FakePicturePileImpl> active_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+
+  SetupTrees(pending_pile, active_pile);
+
+  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  EXPECT_LT(low_res_factor, 1.f);
+
+  ResetTilingsAndRasterScales();
+
   SetupDrawPropertiesAndUpdateTiles(pending_layer_,
                                     6.f,  // ideal contents scale
                                     3.f,  // device scale
                                     2.f,  // page scale
                                     1.f,  // maximum animation scale
                                     false);
   ASSERT_EQ(1u, pending_layer_->tilings()->num_tilings());
   EXPECT_FLOAT_EQ(6.f,
                   pending_layer_->tilings()->tiling_at(0)->contents_scale());
 
   // If we change the page scale factor, then we should get new tilings.
   SetupDrawPropertiesAndUpdateTiles(pending_layer_,
                                     6.6f,  // ideal contents scale
                                     3.f,   // device scale
                                     2.2f,  // page scale
                                     1.f,   // maximum animation scale
                                     false);
-  ASSERT_EQ(2u, 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());
 
   // If we change the device scale factor, then we should get new tilings.
   SetupDrawPropertiesAndUpdateTiles(pending_layer_,
                                     7.26f,  // ideal contents scale
                                     3.3f,   // device scale
                                     2.2f,   // page scale
                                     1.f,    // maximum animation scale
                                     false);
-  ASSERT_EQ(3u, 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());
 
   // 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_,
                                     7.26f,  // ideal contents scale
                                     2.2f,   // device scale
                                     3.3f,   // page scale
                                     1.f,    // maximum animation scale
                                     false);
-  ASSERT_EQ(3u, 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());
 }
 
 TEST_F(NoLowResPictureLayerImplTest, AllHighResRequiredEvenIfShared) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
 
-  host_impl_.SetViewportSize(layer_bounds);
-
-  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size);
-
-  CreateHighLowResAndSetAllTilesVisible();
+  SetupDefaultTreesWithFixedTileSize(layer_bounds, tile_size, Region());
 
   Tile* some_active_tile =
       active_layer_->HighResTiling()->AllTilesForTesting()[0];
   EXPECT_FALSE(some_active_tile->IsReadyToDraw());
 
   // All tiles shared (no invalidation), so even though the active tree's
   // tiles aren't ready, there is nothing required.
   pending_layer_->HighResTiling()->UpdateAllTilePrioritiesForTesting();
   if (host_impl_.settings().create_low_res_tiling)
     pending_layer_->LowResTiling()->UpdateAllTilePrioritiesForTesting();
 
   AssertAllTilesRequired(pending_layer_->HighResTiling());
   if (host_impl_.settings().create_low_res_tiling)
     AssertNoTilesRequired(pending_layer_->LowResTiling());
 }
 
 TEST_F(NoLowResPictureLayerImplTest, NothingRequiredIfActiveMissingTiles) {
   gfx::Size layer_bounds(400, 400);
   gfx::Size tile_size(100, 100);
+
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   // This pile 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<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateEmptyPileThatThinksItHasRecordings(
           tile_size, layer_bounds);
-  SetupTrees(pending_pile, active_pile);
-  pending_layer_->set_fixed_tile_size(tile_size);
-  active_layer_->set_fixed_tile_size(tile_size);
 
-  CreateHighLowResAndSetAllTilesVisible();
+  SetupTreesWithFixedTileSize(pending_pile, active_pile, 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);
 
   // Since the active layer has no tiles at all, the pending layer doesn't
   // need content in order to activate.
   pending_layer_->HighResTiling()->UpdateAllTilePrioritiesForTesting();
@@ skipping 12 matching lines @@
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
 
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(400, 400);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
-  SetupTrees(pending_pile, active_pile);
+  SetupTreesWithInvalidation(pending_pile, active_pile, Region());
 
-  Region invalidation;
-  AddDefaultTilingsWithInvalidation(invalidation);
   SetupDrawPropertiesAndUpdateTiles(active_layer_, 1.f, 1.f, 1.f, 1.f, false);
 
   // UpdateTiles with valid viewport. Should update tile viewport.
   // Note viewport is considered invalid if and only if in resourceless
   // software draw.
   bool resourceless_software_draw = false;
   gfx::Rect viewport = gfx::Rect(layer_bounds);
   gfx::Transform transform;
   host_impl_.SetExternalDrawConstraints(transform,
                                         viewport,
@@ skipping 59 matching lines @@
   gfx::Size layer_bounds(1300, 1900);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
   std::vector<PictureLayerTiling*> used_tilings;
 
   SetupTrees(pending_pile, active_pile);
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
 
   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, false);
   ASSERT_EQ(1u, active_layer_->tilings()->num_tilings());
 
   // 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());
 
   host_impl_.PinchGestureBegin();
 
@@ skipping 65 matching lines @@
   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());
 }
 
-TEST_F(PictureLayerImplTest, ScaleCollision) {
-  gfx::Size tile_size(400, 400);
-  gfx::Size layer_bounds(1300, 1900);
-
-  scoped_refptr<FakePicturePileImpl> pending_pile =
-      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-  scoped_refptr<FakePicturePileImpl> active_pile =
-      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-
-  std::vector<PictureLayerTiling*> used_tilings;
-
-  SetupTrees(pending_pile, active_pile);
-
-  float pending_contents_scale = 1.f;
-  float active_contents_scale = 2.f;
-  float device_scale_factor = 1.f;
-  float page_scale_factor = 1.f;
-  float maximum_animation_contents_scale = 1.f;
-  bool animating_transform = false;
-
-  EXPECT_TRUE(host_impl_.settings().create_low_res_tiling);
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
-  EXPECT_LT(low_res_factor, 1.f);
-
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
-                                    pending_contents_scale,
-                                    device_scale_factor,
-                                    page_scale_factor,
-                                    maximum_animation_contents_scale,
-                                    animating_transform);
-  SetupDrawPropertiesAndUpdateTiles(active_layer_,
-                                    active_contents_scale,
-                                    device_scale_factor,
-                                    page_scale_factor,
-                                    maximum_animation_contents_scale,
-                                    animating_transform);
-
-  ASSERT_EQ(4u, pending_layer_->tilings()->num_tilings());
-  ASSERT_EQ(4u, active_layer_->tilings()->num_tilings());
-
-  EXPECT_EQ(active_contents_scale,
-            pending_layer_->tilings()->tiling_at(0)->contents_scale());
-  EXPECT_EQ(pending_contents_scale,
-            pending_layer_->tilings()->tiling_at(1)->contents_scale());
-  EXPECT_EQ(active_contents_scale * low_res_factor,
-            pending_layer_->tilings()->tiling_at(2)->contents_scale());
-  EXPECT_EQ(pending_contents_scale * low_res_factor,
-            pending_layer_->tilings()->tiling_at(3)->contents_scale());
-
-  EXPECT_EQ(active_contents_scale,
-            active_layer_->tilings()->tiling_at(0)->contents_scale());
-  EXPECT_EQ(pending_contents_scale,
-            active_layer_->tilings()->tiling_at(1)->contents_scale());
-  EXPECT_EQ(active_contents_scale * low_res_factor,
-            active_layer_->tilings()->tiling_at(2)->contents_scale());
-  EXPECT_EQ(pending_contents_scale * low_res_factor,
-            active_layer_->tilings()->tiling_at(3)->contents_scale());
-
-  // The unused low res tiling from the pending tree must be kept or we may add
-  // it again on the active tree and collide with the pending tree.
-  used_tilings.push_back(active_layer_->tilings()->tiling_at(1));
-  active_layer_->CleanUpTilingsOnActiveLayer(used_tilings);
-  ASSERT_EQ(4u, active_layer_->tilings()->num_tilings());
-
-  EXPECT_EQ(active_contents_scale,
-            active_layer_->tilings()->tiling_at(0)->contents_scale());
-  EXPECT_EQ(pending_contents_scale,
-            active_layer_->tilings()->tiling_at(1)->contents_scale());
-  EXPECT_EQ(active_contents_scale * low_res_factor,
-            active_layer_->tilings()->tiling_at(2)->contents_scale());
-  EXPECT_EQ(pending_contents_scale * low_res_factor,
-            active_layer_->tilings()->tiling_at(3)->contents_scale());
-}
-
 TEST_F(NoLowResPictureLayerImplTest, ReleaseResources) {
   gfx::Size tile_size(400, 400);
   gfx::Size layer_bounds(1300, 1900);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
   SetupTrees(pending_pile, active_pile);
-  EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
-
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_,
-                                    1.3f,  // ideal contents scale
-                                    2.7f,  // device scale
-                                    3.2f,  // page scale
-                                    1.f,   // maximum animation scale
-                                    false);
   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_EQ(0u, active_layer_->tilings()->num_tilings());
   pending_layer_->ReleaseResources();
   EXPECT_EQ(0u, pending_layer_->tilings()->num_tilings());
 
   // This should create new tilings.
   SetupDrawPropertiesAndUpdateTiles(pending_layer_,
                                     1.3f,  // ideal contents scale
                                     2.7f,  // device scale
                                     3.2f,  // page scale
                                     1.f,   // maximum animation scale
                                     false);
   EXPECT_EQ(1u, pending_layer_->tilings()->num_tilings());
 }
 
 TEST_F(PictureLayerImplTest, SharedQuadStateContainsMaxTilingScale) {
   scoped_ptr<RenderPass> render_pass = RenderPass::Create();
 
   gfx::Size tile_size(400, 400);
   gfx::Size layer_bounds(1000, 2000);
 
-  host_impl_.SetViewportSize(layer_bounds);
+  host_impl_.SetViewportSize(gfx::Size(10000, 20000));
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
   SetupTrees(pending_pile, active_pile);
 
-  SetupDrawPropertiesAndUpdateTiles(pending_layer_, 2.5f, 1.f, 1.f, 1.f, false);
-  host_impl_.pending_tree()->UpdateDrawProperties();
-
-  active_layer_->draw_properties().visible_content_rect =
-      gfx::Rect(layer_bounds);
-  host_impl_.active_tree()->UpdateDrawProperties();
+  ResetTilingsAndRasterScales();
+  SetupDrawPropertiesAndUpdateTiles(active_layer_, 2.5f, 1.f, 1.f, 1.f, false);
 
   float max_contents_scale = active_layer_->MaximumTilingContentsScale();
+  EXPECT_EQ(2.5f, max_contents_scale);
+
   gfx::Transform scaled_draw_transform = active_layer_->draw_transform();
   scaled_draw_transform.Scale(SK_MScalar1 / max_contents_scale,
                               SK_MScalar1 / max_contents_scale);
 
   AppendQuadsData data;
   active_layer_->AppendQuads(render_pass.get(), Occlusion(), &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 content_to_target_transform should be scaled by the
@@ skipping 16 matching lines @@
 TEST_F(PictureLayerImplTest, UpdateTilesForMasksWithNoVisibleContent) {
   gfx::Size tile_size(400, 400);
   gfx::Size bounds(100000, 100);
 
   host_impl_.CreatePendingTree();
 
   scoped_ptr<LayerImpl> root = LayerImpl::Create(host_impl_.pending_tree(), 1);
 
   scoped_ptr<FakePictureLayerImpl> layer_with_mask =
       FakePictureLayerImpl::Create(host_impl_.pending_tree(), 2);
-
   layer_with_mask->SetBounds(bounds);
   layer_with_mask->SetContentBounds(bounds);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, bounds);
   scoped_ptr<FakePictureLayerImpl> mask =
-      FakePictureLayerImpl::CreateWithRasterSource(host_impl_.pending_tree(), 3,
-                                                   pending_pile);
-  mask->set_is_mask(true);
-
+      FakePictureLayerImpl::CreateMaskWithRasterSource(
+          host_impl_.pending_tree(), 3, pending_pile);
   mask->SetBounds(bounds);
   mask->SetContentBounds(bounds);
   mask->SetDrawsContent(true);
+  layer_with_mask->SetMaskLayer(mask.Pass());
 
-  FakePictureLayerImpl* pending_mask_content = mask.get();
-  layer_with_mask->SetMaskLayer(mask.Pass());
+  FakePictureLayerImpl* pending_mask =
+      static_cast<FakePictureLayerImpl*>(layer_with_mask->mask_layer());
 
   scoped_ptr<FakePictureLayerImpl> child_of_layer_with_mask =
       FakePictureLayerImpl::Create(host_impl_.pending_tree(), 4);
-
   child_of_layer_with_mask->SetBounds(bounds);
   child_of_layer_with_mask->SetContentBounds(bounds);
   child_of_layer_with_mask->SetDrawsContent(true);
-
   layer_with_mask->AddChild(child_of_layer_with_mask.Pass());
-
   root->AddChild(layer_with_mask.Pass());
 
   host_impl_.pending_tree()->SetRootLayer(root.Pass());
 
-  EXPECT_FALSE(pending_mask_content->tilings());
+  EXPECT_EQ(0u, pending_mask->num_tilings());
   host_impl_.pending_tree()->UpdateDrawProperties();
-  EXPECT_NE(0u, pending_mask_content->num_tilings());
+  EXPECT_NE(0u, pending_mask->num_tilings());
 }
 
 class PictureLayerImplTestWithDelegatingRenderer : public PictureLayerImplTest {
  public:
   PictureLayerImplTestWithDelegatingRenderer() : PictureLayerImplTest() {}
 
   void InitializeRenderer() override {
     host_impl_.InitializeRenderer(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 tile_size = host_impl_.settings().default_tile_size;
   gfx::Size layer_bounds(1000, 1000);
 
   // Create tiles.
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   SetupPendingTree(pending_pile);
   pending_layer_->SetBounds(layer_bounds);
-  host_impl_.SetViewportSize(layer_bounds);
   ActivateTree();
   host_impl_.active_tree()->UpdateDrawProperties();
   std::vector<Tile*> 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.
@@ skipping 86 matching lines @@
   base::TimeTicks time_ticks;
   time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentBeginFrameArgs(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
 
   gfx::Size tile_size(102, 102);
   gfx::Size layer_bounds(1000, 1000);
   gfx::Size viewport_size(500, 500);
   gfx::Point occluding_layer_position(310, 0);
 
+  host_impl_.SetViewportSize(viewport_size);
+
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-  SetupPendingTree(pending_pile);
-  pending_layer_->set_fixed_tile_size(tile_size);
-
-  host_impl_.SetViewportSize(viewport_size);
-  host_impl_.pending_tree()->UpdateDrawProperties();
+  SetupPendingTreeWithFixedTileSize(pending_pile, tile_size, Region());
 
   // No occlusion.
   int unoccluded_tile_count = 0;
   scoped_ptr<TilingSetRasterQueue> queue =
       pending_layer_->CreateRasterQueue(false);
   while (!queue->IsEmpty()) {
     Tile* tile = queue->Top();
 
     // Occluded tiles should not be iterated over.
     EXPECT_FALSE(tile->is_occluded(PENDING_TREE));
@@ skipping 66 matching lines @@
   base::TimeTicks time_ticks;
   time_ticks += base::TimeDelta::FromMilliseconds(1);
   host_impl_.SetCurrentBeginFrameArgs(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
 
   gfx::Size tile_size(102, 102);
   gfx::Size layer_bounds(1000, 1000);
   gfx::Size viewport_size(500, 500);
   gfx::Point occluding_layer_position(310, 0);
 
+  host_impl_.SetViewportSize(viewport_size);
+
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-  SetupPendingTree(pending_pile);
-  pending_layer_->set_fixed_tile_size(tile_size);
-
-  host_impl_.SetViewportSize(viewport_size);
-  host_impl_.pending_tree()->UpdateDrawProperties();
+  SetupPendingTreeWithFixedTileSize(pending_pile, 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);
 
     occluded_tile_count = 0;
     for (PictureLayerTiling::CoverageIterator iter(
              tiling,
              pending_layer_->contents_scale_x(),
@@ skipping 94 matching lines @@
       case 1:
         EXPECT_EQ(4, occluded_tile_count);
         break;
       default:
         NOTREACHED();
     }
   }
 }
 
 TEST_F(OcclusionTrackingPictureLayerImplTest, OcclusionForDifferentScales) {
+  base::TimeTicks time_ticks;
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
+  host_impl_.SetCurrentBeginFrameArgs(
+      CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
+
   gfx::Size tile_size(102, 102);
   gfx::Size layer_bounds(1000, 1000);
   gfx::Size viewport_size(500, 500);
   gfx::Point occluding_layer_position(310, 0);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-  SetupPendingTree(pending_pile);
-  pending_layer_->set_fixed_tile_size(tile_size);
 
+  host_impl_.SetViewportSize(viewport_size);
+
+  SetupPendingTreeWithFixedTileSize(pending_pile, tile_size, Region());
   ASSERT_TRUE(pending_layer_->CanHaveTilings());
 
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
-
-  std::vector<PictureLayerTiling*> tilings;
-  tilings.push_back(pending_layer_->AddTiling(low_res_factor));
-  tilings.push_back(pending_layer_->AddTiling(0.3f));
-  tilings.push_back(pending_layer_->AddTiling(0.7f));
-  tilings.push_back(pending_layer_->AddTiling(1.0f));
-  tilings.push_back(pending_layer_->AddTiling(2.0f));
-
   pending_layer_->AddChild(LayerImpl::Create(host_impl_.pending_tree(), 1));
   LayerImpl* layer1 = pending_layer_->children()[0];
   layer1->SetBounds(layer_bounds);
   layer1->SetContentBounds(layer_bounds);
   layer1->SetDrawsContent(true);
   layer1->SetContentsOpaque(true);
   layer1->SetPosition(occluding_layer_position);
 
-  host_impl_.SetViewportSize(viewport_size);
+  pending_layer_->tilings()->RemoveAllTilings();
+  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  pending_layer_->AddTiling(low_res_factor);
+  pending_layer_->AddTiling(0.3f);
+  pending_layer_->AddTiling(0.7f);
+  pending_layer_->AddTiling(1.0f);
+  pending_layer_->AddTiling(2.0f);
+
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
+  host_impl_.SetCurrentBeginFrameArgs(
+      CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
+  // UpdateDrawProperties with the occluding layer.
   host_impl_.pending_tree()->UpdateDrawProperties();
 
-  int tiling_count = 0;
+  EXPECT_EQ(5u, pending_layer_->num_tilings());
+
   int occluded_tile_count = 0;
-  for (std::vector<PictureLayerTiling*>::iterator tiling_iterator =
-           tilings.begin();
-       tiling_iterator != tilings.end();
-       ++tiling_iterator) {
-    (*tiling_iterator)->UpdateAllTilePrioritiesForTesting();
-    std::vector<Tile*> tiles = (*tiling_iterator)->AllTilesForTesting();
+  for (size_t i = 0; i < pending_layer_->num_tilings(); ++i) {
+    PictureLayerTiling* tiling = pending_layer_->tilings()->tiling_at(i);
+    tiling->UpdateAllTilePrioritiesForTesting();
+    std::vector<Tile*> tiles = tiling->AllTilesForTesting();
 
     occluded_tile_count = 0;
-    for (size_t i = 0; i < tiles.size(); ++i) {
-      if (tiles[i]->is_occluded(PENDING_TREE)) {
+    for (size_t j = 0; j < tiles.size(); ++j) {
+      if (tiles[j]->is_occluded(PENDING_TREE)) {
         gfx::Rect scaled_content_rect = ScaleToEnclosingRect(
-            tiles[i]->content_rect(), 1.0f / tiles[i]->contents_scale());
+            tiles[j]->content_rect(), 1.0f / tiles[j]->contents_scale());
         EXPECT_GE(scaled_content_rect.x(), occluding_layer_position.x());
         occluded_tile_count++;
       }
     }
-    switch (tiling_count) {
+
+    switch (i) {
       case 0:
+        EXPECT_EQ(occluded_tile_count, 30);
+        break;
       case 1:
-        EXPECT_EQ(occluded_tile_count, 2);
+        EXPECT_EQ(occluded_tile_count, 5);
         break;
       case 2:
         EXPECT_EQ(occluded_tile_count, 4);
         break;
+      case 4:
       case 3:
-        EXPECT_EQ(occluded_tile_count, 5);
-        break;
-      case 4:
-        EXPECT_EQ(occluded_tile_count, 30);
+        EXPECT_EQ(occluded_tile_count, 2);
         break;
       default:
         NOTREACHED();
     }
-
-    tiling_count++;
   }
-
-  EXPECT_EQ(tiling_count, 5);
 }
 
 TEST_F(OcclusionTrackingPictureLayerImplTest, DifferentOcclusionOnTrees) {
   gfx::Size tile_size(102, 102);
   gfx::Size layer_bounds(1000, 1000);
   gfx::Size viewport_size(1000, 1000);
   gfx::Point occluding_layer_position(310, 0);
   gfx::Rect invalidation_rect(230, 230, 102, 102);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-  SetupTrees(pending_pile, active_pile);
+
+  host_impl_.SetViewportSize(viewport_size);
+  SetupPendingTree(active_pile);
 
   // Partially occlude the active layer.
-  active_layer_->AddChild(LayerImpl::Create(host_impl_.active_tree(), 2));
-  LayerImpl* layer1 = active_layer_->children()[0];
+  pending_layer_->AddChild(LayerImpl::Create(host_impl_.pending_tree(), 2));
+  LayerImpl* layer1 = pending_layer_->children()[0];
   layer1->SetBounds(layer_bounds);
   layer1->SetContentBounds(layer_bounds);
   layer1->SetDrawsContent(true);
   layer1->SetContentsOpaque(true);
   layer1->SetPosition(occluding_layer_position);
 
+  ActivateTree();
+
   // Partially invalidate the pending layer.
-  pending_layer_->set_invalidation(invalidation_rect);
-
-  host_impl_.SetViewportSize(viewport_size);
-
-  active_layer_->CreateDefaultTilingsAndTiles();
-  pending_layer_->CreateDefaultTilingsAndTiles();
+  SetupPendingTreeWithInvalidation(pending_pile, invalidation_rect);
 
   for (size_t i = 0; i < pending_layer_->num_tilings(); ++i) {
     PictureLayerTiling* tiling = pending_layer_->tilings()->tiling_at(i);
     tiling->UpdateAllTilePrioritiesForTesting();
 
     for (PictureLayerTiling::CoverageIterator iter(
              tiling,
              pending_layer_->contents_scale_x(),
              gfx::Rect(layer_bounds));
          iter;
@@ skipping 58 matching lines @@
         // the occluding layer.
         EXPECT_EQ(tile->is_occluded(ACTIVE_TREE),
                   scaled_content_rect.x() >= occluding_layer_position.x());
       }
     }
   }
 }
 
 TEST_F(OcclusionTrackingPictureLayerImplTest,
        OccludedTilesConsideredDuringEviction) {
+  base::TimeTicks time_ticks;
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
+  host_impl_.SetCurrentBeginFrameArgs(
+      CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
+
   gfx::Size tile_size(102, 102);
   gfx::Size layer_bounds(1000, 1000);
-  gfx::Size viewport_size(500, 500);
+  gfx::Size viewport_size(1000, 1000);
   gfx::Point pending_occluding_layer_position(310, 0);
   gfx::Point active_occluding_layer_position(0, 310);
   gfx::Rect invalidation_rect(230, 230, 102, 102);
 
+  host_impl_.SetViewportSize(viewport_size);
+  host_impl_.SetDeviceScaleFactor(2.f);
+
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
-  SetupTrees(pending_pile, active_pile);
 
-  pending_layer_->set_fixed_tile_size(tile_size);
-  active_layer_->set_fixed_tile_size(tile_size);
+  SetupPendingTreeWithFixedTileSize(active_pile, tile_size, Region());
 
-  float low_res_factor = host_impl_.settings().low_res_contents_scale_factor;
+  // Partially occlude the active layer.
+  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->SetContentBounds(layer_bounds);
+  active_occluding_layer->SetDrawsContent(true);
+  active_occluding_layer->SetContentsOpaque(true);
+  active_occluding_layer->SetPosition(active_occluding_layer_position);
 
-  std::vector<PictureLayerTiling*> tilings;
-  tilings.push_back(pending_layer_->AddTiling(low_res_factor));
-  tilings.push_back(pending_layer_->AddTiling(0.3f));
-  tilings.push_back(pending_layer_->AddTiling(0.7f));
-  tilings.push_back(pending_layer_->AddTiling(1.0f));
-  tilings.push_back(pending_layer_->AddTiling(2.0f));
+  ActivateTree();
 
-  EXPECT_EQ(5u, pending_layer_->num_tilings());
-  EXPECT_EQ(5u, active_layer_->num_tilings());
+  // Partially invalidate the pending layer. Tiles inside the invalidation rect
+  // are not shared between trees.
+  SetupPendingTreeWithFixedTileSize(pending_pile, tile_size, invalidation_rect);
 
-  // Partially occlude the pending layer.
-  pending_layer_->AddChild(LayerImpl::Create(host_impl_.pending_tree(), 1));
+  // 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_occluding_layer->SetBounds(layer_bounds);
   pending_occluding_layer->SetContentBounds(layer_bounds);
   pending_occluding_layer->SetDrawsContent(true);
   pending_occluding_layer->SetContentsOpaque(true);
   pending_occluding_layer->SetPosition(pending_occluding_layer_position);
 
-  // Partially occlude the active layer.
-  active_layer_->AddChild(LayerImpl::Create(host_impl_.active_tree(), 2));
-  LayerImpl* active_occluding_layer = active_layer_->children()[0];
-  active_occluding_layer->SetBounds(layer_bounds);
-  active_occluding_layer->SetContentBounds(layer_bounds);
-  active_occluding_layer->SetDrawsContent(true);
-  active_occluding_layer->SetContentsOpaque(true);
-  active_occluding_layer->SetPosition(active_occluding_layer_position);
+  EXPECT_EQ(2u, pending_layer_->num_tilings());
+  EXPECT_EQ(2u, active_layer_->num_tilings());
 
-  // Partially invalidate the pending layer. Tiles inside the invalidation rect
-  // are not shared between trees.
-  pending_layer_->set_invalidation(invalidation_rect);
-
-  host_impl_.SetViewportSize(viewport_size);
-  host_impl_.active_tree()->UpdateDrawProperties();
+  time_ticks += base::TimeDelta::FromMilliseconds(1);
+  host_impl_.SetCurrentBeginFrameArgs(
+      CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, time_ticks));
+  // UpdateDrawProperties with the occluding layer.
   host_impl_.pending_tree()->UpdateDrawProperties();
 
-  // The expected number of occluded tiles on each of the 5 tilings for each of
+  // 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_both[] = {9u, 1u, 1u, 1u, 1u};
-  size_t expected_occluded_tile_count_on_active[] = {30u, 5u, 4u, 2u, 2u};
-  size_t expected_occluded_tile_count_on_pending[] = {30u, 5u, 4u, 2u, 2u};
+  size_t expected_occluded_tile_count_on_both[] = {9u, 1u};
+  size_t expected_occluded_tile_count_on_active[] = {30u, 3u};
+  size_t expected_occluded_tile_count_on_pending[] = {30u, 3u};
 
   // The total expected number of occluded tiles on all tilings for each of the
   // 3 tree priorities.
-  size_t total_expected_occluded_tile_count[] = {13u, 43u, 43u};
+  size_t total_expected_occluded_tile_count[] = {10u, 33u, 33u};
 
   ASSERT_EQ(arraysize(total_expected_occluded_tile_count), NUM_TREE_PRIORITIES);
 
   // 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);
-    tiling->CreateAllTilesForTesting();
     tiling->UpdateAllTilePrioritiesForTesting();
 
     size_t occluded_tile_count_on_pending = 0u;
     size_t occluded_tile_count_on_active = 0u;
     size_t occluded_tile_count_on_both = 0u;
-    for (PictureLayerTiling::CoverageIterator iter(
-             tiling,
-             pending_layer_->contents_scale_x(),
-             gfx::Rect(layer_bounds));
-         iter;
-         ++iter) {
+    for (PictureLayerTiling::CoverageIterator iter(tiling, 1.f,
+                                                   gfx::Rect(layer_bounds));
+         iter; ++iter) {
       Tile* tile = *iter;
 
+      if (!tile)
+        continue;
       if (tile->is_occluded(PENDING_TREE))
         occluded_tile_count_on_pending++;
       if (tile->is_occluded(ACTIVE_TREE))
         occluded_tile_count_on_active++;
       if (tile->is_occluded(PENDING_TREE) && tile->is_occluded(ACTIVE_TREE))
         occluded_tile_count_on_both++;
     }
     EXPECT_EQ(expected_occluded_tile_count_on_pending[i],
               occluded_tile_count_on_pending)
-        << i;
+        << tiling->contents_scale();
     EXPECT_EQ(expected_occluded_tile_count_on_active[i],
               occluded_tile_count_on_active)
-        << i;
+        << tiling->contents_scale();
     EXPECT_EQ(expected_occluded_tile_count_on_both[i],
               occluded_tile_count_on_both)
-        << i;
+        << 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);
-    tiling->CreateAllTilesForTesting();
     tiling->UpdateAllTilePrioritiesForTesting();
 
     size_t occluded_tile_count_on_pending = 0u;
     size_t occluded_tile_count_on_active = 0u;
     size_t occluded_tile_count_on_both = 0u;
     for (PictureLayerTiling::CoverageIterator iter(
              tiling,
              pending_layer_->contents_scale_x(),
              gfx::Rect(layer_bounds));
          iter;
          ++iter) {
       Tile* tile = *iter;
 
+      if (!tile)
+        continue;
       if (tile->is_occluded(PENDING_TREE))
         occluded_tile_count_on_pending++;
       if (tile->is_occluded(ACTIVE_TREE))
         occluded_tile_count_on_active++;
       if (tile->is_occluded(PENDING_TREE) && tile->is_occluded(ACTIVE_TREE))
         occluded_tile_count_on_both++;
     }
     EXPECT_EQ(expected_occluded_tile_count_on_pending[i],
               occluded_tile_count_on_pending)
         << i;
     EXPECT_EQ(expected_occluded_tile_count_on_active[i],
               occluded_tile_count_on_active)
         << i;
     EXPECT_EQ(expected_occluded_tile_count_on_both[i],
               occluded_tile_count_on_both)
         << i;
   }
 
   std::vector<Tile*> all_tiles;
-  for (std::vector<PictureLayerTiling*>::iterator tiling_iterator =
-           tilings.begin();
-       tiling_iterator != tilings.end();
-       ++tiling_iterator) {
-    std::vector<Tile*> tiles = (*tiling_iterator)->AllTilesForTesting();
-    std::copy(tiles.begin(), tiles.end(), std::back_inserter(all_tiles));
+  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());
   }
 
   host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(all_tiles);
 
   VerifyEvictionConsidersOcclusion(pending_layer_,
                                    total_expected_occluded_tile_count);
   VerifyEvictionConsidersOcclusion(active_layer_,
                                    total_expected_occluded_tile_count);
 }
 
@@ skipping 61 matching lines @@
   gfx::Size layer_bounds(200, 200);
   gfx::Rect layer_rect(layer_bounds);
 
   FakeContentLayerClient client;
   scoped_refptr<PictureLayer> layer = PictureLayer::Create(&client);
   FakeLayerTreeHostClient host_client(FakeLayerTreeHostClient::DIRECT_3D);
   scoped_ptr<FakeLayerTreeHost> host = FakeLayerTreeHost::Create(&host_client);
   host->SetRootLayer(layer);
   RecordingSource* recording_source = layer->GetRecordingSourceForTesting();
 
-  host_impl_.SetViewportSize(layer_bounds);
-
   int frame_number = 0;
 
   client.set_fill_with_nonsolid_color(!test_for_solid);
 
   Region invalidation(layer_rect);
   recording_source->UpdateAndExpandInvalidation(
       &client, &invalidation, false, layer_bounds, layer_rect, frame_number++,
       Picture::RECORD_NORMALLY);
 
   scoped_refptr<RasterSource> pending_raster_source =
       recording_source->CreateRasterSource();
 
-  SetupPendingTree(pending_raster_source);
+  SetupPendingTreeWithFixedTileSize(pending_raster_source, tile_size, Region());
   ActivateTree();
 
-  active_layer_->set_fixed_tile_size(tile_size);
-  host_impl_.active_tree()->UpdateDrawProperties();
   if (test_for_solid) {
     EXPECT_EQ(0u, active_layer_->tilings()->num_tilings());
   } else {
     ASSERT_TRUE(active_layer_->tilings());
     ASSERT_GT(active_layer_->tilings()->num_tilings(), 0u);
     std::vector<Tile*> tiles =
         active_layer_->tilings()->tiling_at(0)->AllTilesForTesting();
     EXPECT_FALSE(tiles.empty());
     host_impl_.tile_manager()->InitializeTilesWithResourcesForTesting(tiles);
   }
@@ skipping 28 matching lines @@
   gfx::Size layer_bounds(200, 200);
   gfx::Rect layer_rect(layer_bounds);
 
   FakeContentLayerClient client;
   scoped_refptr<PictureLayer> layer = PictureLayer::Create(&client);
   FakeLayerTreeHostClient host_client(FakeLayerTreeHostClient::DIRECT_3D);
   scoped_ptr<FakeLayerTreeHost> host = FakeLayerTreeHost::Create(&host_client);
   host->SetRootLayer(layer);
   RecordingSource* recording_source = layer->GetRecordingSourceForTesting();
 
-  host_impl_.SetViewportSize(layer_bounds);
-
   int frame_number = 0;
 
   client.set_fill_with_nonsolid_color(true);
 
   Region invalidation1(layer_rect);
   recording_source->UpdateAndExpandInvalidation(
       &client, &invalidation1, false, layer_bounds, layer_rect, frame_number++,
       Picture::RECORD_NORMALLY);
 
   scoped_refptr<RasterSource> raster_source1 =
@@ skipping 144 matching lines @@
   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(), 500 + 2);
 }
 
 }  // namespace
 }  // namespace cc