cc: Change how/when we build layer list/property tress in tests.

cc/trees/layer_tree_host_impl_unittest.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 149 matching lines @@
   }
   void DidActivateSyncTree() override {}
   void WillPrepareTiles() override {}
   void DidPrepareTiles() override {}
   void DidCompletePageScaleAnimationOnImplThread() override {
     did_complete_page_scale_animation_ = true;
   }
   void OnDrawForOutputSurface(bool resourceless_software_draw) override {
     std::unique_ptr<LayerTreeHostImpl::FrameData> frame(
         new LayerTreeHostImpl::FrameData);
-    EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(frame.get()));
+    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(frame.get()));
     last_on_draw_render_passes_.clear();
     RenderPass::CopyAll(frame->render_passes, &last_on_draw_render_passes_);
     if (!skip_draw_layers_in_on_draw_)
       host_impl_->DrawLayers(frame.get());
     host_impl_->DidDrawAllLayers(*frame);
     host_impl_->SwapBuffers(*frame);
     last_on_draw_frame_ = std::move(frame);
   }
 
   void set_reduce_memory_result(bool reduce_memory_result) {
@@ skipping 151 matching lines @@
     contents->SetPosition(gfx::PointF());
 
     outer_scroll->test_properties()->AddChild(std::move(contents));
     outer_clip->test_properties()->AddChild(std::move(outer_scroll));
     inner_scroll->test_properties()->AddChild(std::move(outer_clip));
     page_scale->test_properties()->AddChild(std::move(inner_scroll));
     inner_clip->test_properties()->AddChild(std::move(page_scale));
     root->test_properties()->AddChild(std::move(inner_clip));
 
     layer_tree_impl->SetRootLayerForTesting(std::move(root));
+    layer_tree_impl->BuildLayerListAndPropertyTreesForTesting();
     layer_tree_impl->SetViewportLayersFromIds(
         Layer::INVALID_ID, kPageScaleLayerId, kInnerViewportScrollLayerId,
         kOuterViewportScrollLayerId);
 
     layer_tree_impl->DidBecomeActive();
     return layer_tree_impl->InnerViewportScrollLayer();
   }
 
   LayerImpl* SetupScrollAndContentsLayers(const gfx::Size& content_size) {
     LayerImpl* scroll_layer = CreateScrollAndContentsLayers(
         host_impl_->active_tree(), content_size);
-    SetNeedsRebuildPropertyTrees();
-    RebuildPropertyTrees();
     host_impl_->active_tree()->DidBecomeActive();
     return scroll_layer;
   }
 
   // Sets up a typical virtual viewport setup with one child content layer.
   // Returns a pointer to the content layer.
   LayerImpl* CreateBasicVirtualViewportLayers(const gfx::Size& viewport_size,
                                               const gfx::Size& content_size) {
     // CreateScrollAndContentsLayers makes the outer viewport unscrollable and
     // the inner a different size from the outer. We'll reuse its layer
@@ skipping 67 matching lines @@
   std::unique_ptr<ScrollState> EndState() {
     ScrollStateData scroll_state_data;
     scroll_state_data.is_ending = true;
     std::unique_ptr<ScrollState> scroll_state(
         new ScrollState(scroll_state_data));
     return scroll_state;
   }
 
   void DrawFrame() {
     LayerTreeHostImpl::FrameData frame;
-    EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
     host_impl_->DrawLayers(&frame);
     host_impl_->DidDrawAllLayers(frame);
   }
 
-  void SetNeedsRebuildPropertyTrees() {
-    host_impl_->active_tree()->property_trees()->needs_rebuild = true;
-  }
-
-  void RebuildPropertyTrees() {
-    host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
-  }
-
-  DrawResult PrepareToDrawFrame(LayerTreeHostImpl::FrameData* frame) {
-    // We need to build property trees here before drawing the frame as they are
-    // not built on the impl thread.
-    RebuildPropertyTrees();
-    return host_impl_->PrepareToDraw(frame);
-  }
-
   void pinch_zoom_pan_viewport_forces_commit_redraw(float device_scale_factor);
   void pinch_zoom_pan_viewport_test(float device_scale_factor);
   void pinch_zoom_pan_viewport_and_scroll_test(float device_scale_factor);
   void pinch_zoom_pan_viewport_and_scroll_boundary_test(
       float device_scale_factor);
 
   void SetupMouseMoveAtWithDeviceScale(float device_scale_factor);
 
   scoped_refptr<AnimationTimeline> timeline() { return timeline_; }
 
  protected:
   virtual std::unique_ptr<OutputSurface> CreateOutputSurface() {
     return FakeOutputSurface::Create3d();
   }
 
   void DrawOneFrame() {
     LayerTreeHostImpl::FrameData frame_data;
-    PrepareToDrawFrame(&frame_data);
+    host_impl_->PrepareToDraw(&frame_data);
     host_impl_->DidDrawAllLayers(frame_data);
   }
 
   static void SetScrollOffsetDelta(LayerImpl* layer_impl,
                                    const gfx::Vector2dF& delta) {
     if (layer_impl->layer_tree_impl()
             ->property_trees()
             ->scroll_tree.SetScrollOffsetDeltaForTesting(layer_impl->id(),
                                                          delta))
       layer_impl->layer_tree_impl()->DidUpdateScrollOffset(
@@ skipping 77 matching lines @@
   EXPECT_TRUE(host_impl_->CanDraw());
   EXPECT_TRUE(on_can_draw_state_changed_called_);
   on_can_draw_state_changed_called_ = false;
 }
 
 TEST_F(LayerTreeHostImplTest, ResourcelessDrawWithEmptyViewport) {
   CreateHostImpl(DefaultSettings(),
                  FakeOutputSurface::CreateSoftware(
                      base::WrapUnique(new SoftwareOutputDevice())));
   SetupScrollAndContentsLayers(gfx::Size(100, 100));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   EXPECT_TRUE(host_impl_->CanDraw());
   host_impl_->SetViewportSize(gfx::Size());
   EXPECT_FALSE(host_impl_->CanDraw());
 
   FakeOutputSurface* fake_output_surface =
       static_cast<FakeOutputSurface*>(host_impl_->output_surface());
   EXPECT_EQ(fake_output_surface->num_sent_frames(), 0u);
   gfx::Transform identity;
   gfx::Rect viewport(100, 100);
   const bool resourceless_software_draw = true;
@@ skipping 23 matching lines @@
         LayerImpl::Create(host_impl_->active_tree(), 4));
     root->test_properties()->children[1]->test_properties()->AddChild(
         LayerImpl::Create(host_impl_->active_tree(), 5));
     root->test_properties()
         ->children[1]
         ->test_properties()
         ->children[0]
         ->test_properties()
         ->AddChild(LayerImpl::Create(host_impl_->active_tree(), 6));
     host_impl_->active_tree()->SetRootLayerForTesting(std::move(root));
+    host_impl_->active_tree()->BuildLayerListForTesting();
   }
-  LayerImpl* root = host_impl_->active_tree()->root_layer_for_testing();
+  LayerImpl* root = *host_impl_->active_tree()->begin();
 
   ExpectClearedScrollDeltasRecursive(root);
 
   std::unique_ptr<ScrollAndScaleSet> scroll_info;
 
   scroll_info = host_impl_->ProcessScrollDeltas();
   ASSERT_EQ(scroll_info->scrolls.size(), 0u);
   ExpectClearedScrollDeltasRecursive(root);
 
   scroll_info = host_impl_->ProcessScrollDeltas();
   ASSERT_EQ(scroll_info->scrolls.size(), 0u);
   ExpectClearedScrollDeltasRecursive(root);
 }
 
 TEST_F(LayerTreeHostImplTest, ScrollDeltaRepeatedScrolls) {
   gfx::ScrollOffset scroll_offset(20, 30);
   gfx::Vector2d scroll_delta(11, -15);
-  {
-    std::unique_ptr<LayerImpl> root_clip =
-        LayerImpl::Create(host_impl_->active_tree(), 2);
-    std::unique_ptr<LayerImpl> root =
-        LayerImpl::Create(host_impl_->active_tree(), 1);
-    root_clip->SetBounds(gfx::Size(10, 10));
-    LayerImpl* root_layer = root.get();
-    root_clip->test_properties()->AddChild(std::move(root));
-    root_layer->SetBounds(gfx::Size(110, 110));
-    root_layer->SetScrollClipLayer(root_clip->id());
-    root_layer->layer_tree_impl()
-        ->property_trees()
-        ->scroll_tree.UpdateScrollOffsetBaseForTesting(root_layer->id(),
-                                                       scroll_offset);
-    host_impl_->active_tree()->SetRootLayerForTesting(std::move(root_clip));
-    host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
-    root_layer->ScrollBy(scroll_delta);
-  }
 
-  LayerImpl* root = host_impl_->active_tree()
-                        ->root_layer_for_testing()
-                        ->test_properties()
-                        ->children[0];
+  auto root_clip_owned = LayerImpl::Create(host_impl_->active_tree(), 2);
+  auto* root_clip = root_clip_owned.get();
+  auto root_owned = LayerImpl::Create(host_impl_->active_tree(), 1);
+  auto* root = root_owned.get();
+
+  root_clip->SetBounds(gfx::Size(10, 10));
+  root_clip->test_properties()->AddChild(std::move(root_owned));
+  root->SetBounds(gfx::Size(110, 110));
+  root->SetScrollClipLayer(root_clip->id());
+  root->layer_tree_impl()
+      ->property_trees()
+      ->scroll_tree.UpdateScrollOffsetBaseForTesting(root->id(), scroll_offset);
+  host_impl_->active_tree()->SetRootLayerForTesting(std::move(root_clip_owned));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   std::unique_ptr<ScrollAndScaleSet> scroll_info;
 
+  root->ScrollBy(scroll_delta);
   scroll_info = host_impl_->ProcessScrollDeltas();
   ASSERT_EQ(scroll_info->scrolls.size(), 1u);
   EXPECT_TRUE(ScrollInfoContains(*scroll_info, root->id(), scroll_delta));
 
   gfx::Vector2d scroll_delta2(-5, 27);
   root->ScrollBy(scroll_delta2);
   scroll_info = host_impl_->ProcessScrollDeltas();
   ASSERT_EQ(scroll_info->scrolls.size(), 1u);
   EXPECT_TRUE(ScrollInfoContains(*scroll_info, root->id(),
                                  scroll_delta + scroll_delta2));
 
   root->ScrollBy(gfx::Vector2d());
   scroll_info = host_impl_->ProcessScrollDeltas();
   EXPECT_TRUE(ScrollInfoContains(*scroll_info, root->id(),
                                  scroll_delta + scroll_delta2));
 }
 
 TEST_F(LayerTreeHostImplTest, ScrollRootCallsCommitAndRedraw) {
   SetupScrollAndContentsLayers(gfx::Size(100, 100));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   host_impl_->SetViewportSize(gfx::Size(50, 50));
   DrawFrame();
 
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point()).get(), InputHandler::WHEEL);
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD, status.thread);
   EXPECT_EQ(MainThreadScrollingReason::kNotScrollingOnMain,
             status.main_thread_scrolling_reasons);
 
   EXPECT_TRUE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(),
                                                       InputHandler::WHEEL));
   host_impl_->ScrollBy(UpdateState(gfx::Point(), gfx::Vector2d(0, 10)).get());
   EXPECT_TRUE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(0, 10),
                                                       InputHandler::WHEEL));
   host_impl_->ScrollEnd(EndState().get());
   EXPECT_FALSE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(),
                                                        InputHandler::WHEEL));
   EXPECT_TRUE(did_request_redraw_);
   EXPECT_TRUE(did_request_commit_);
 }
 
 TEST_F(LayerTreeHostImplTest, ScrollActiveOnlyAfterScrollMovement) {
   SetupScrollAndContentsLayers(gfx::Size(100, 100));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   host_impl_->SetViewportSize(gfx::Size(50, 50));
   DrawFrame();
 
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point()).get(), InputHandler::WHEEL);
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD, status.thread);
   EXPECT_EQ(MainThreadScrollingReason::kNotScrollingOnMain,
             status.main_thread_scrolling_reasons);
 
   EXPECT_FALSE(host_impl_->IsActivelyScrolling());
@@ skipping 88 matching lines @@
 
   LayerImpl* child = 0;
   {
     std::unique_ptr<LayerImpl> child_layer =
         LayerImpl::Create(host_impl_->active_tree(), 6);
     child = child_layer.get();
     child_layer->SetDrawsContent(true);
     child_layer->SetPosition(gfx::PointF(0, 20));
     child_layer->SetBounds(gfx::Size(50, 50));
     scroll->test_properties()->AddChild(std::move(child_layer));
-    SetNeedsRebuildPropertyTrees();
-    RebuildPropertyTrees();
+    host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   }
 
   // Touch handler regions determine whether touch events block scroll.
   root->SetTouchEventHandlerRegion(gfx::Rect(0, 0, 100, 100));
   EXPECT_TRUE(host_impl_->DoTouchEventsBlockScrollAt(gfx::Point(10, 10)));
 
   // But they don't influence the actual handling of the scroll gestures.
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point()).get(), InputHandler::TOUCHSCREEN);
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD, status.thread);
@@ skipping 59 matching lines @@
 }
 
 TEST_F(LayerTreeHostImplTest, NoFlingWhenScrollingOnMain) {
   SetupScrollAndContentsLayers(gfx::Size(100, 100));
   host_impl_->SetViewportSize(gfx::Size(50, 50));
   LayerImpl* root = host_impl_->active_tree()->root_layer_for_testing();
 
   root->set_main_thread_scrolling_reasons(
       MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects);
 
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   DrawFrame();
 
   // Start scrolling a layer
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point()).get(), InputHandler::TOUCHSCREEN);
   EXPECT_EQ(InputHandler::SCROLL_ON_MAIN_THREAD, status.thread);
   EXPECT_EQ(MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects,
             status.main_thread_scrolling_reasons);
 
   // The fling should be ignored since there's no layer being scrolled impl-side
   status = host_impl_->FlingScrollBegin();
   EXPECT_EQ(InputHandler::SCROLL_IGNORED, status.thread);
   EXPECT_EQ(MainThreadScrollingReason::kNoScrollingLayer,
             status.main_thread_scrolling_reasons);
 }
 
 TEST_F(LayerTreeHostImplTest, ShouldScrollOnMainThread) {
   SetupScrollAndContentsLayers(gfx::Size(100, 100));
   host_impl_->SetViewportSize(gfx::Size(50, 50));
   LayerImpl* root = host_impl_->active_tree()->root_layer_for_testing();
 
   root->set_main_thread_scrolling_reasons(
       MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects);
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   DrawFrame();
 
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point()).get(), InputHandler::WHEEL);
   EXPECT_EQ(InputHandler::SCROLL_ON_MAIN_THREAD, status.thread);
   EXPECT_EQ(MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects,
             status.main_thread_scrolling_reasons);
 
   status = host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
                                    InputHandler::TOUCHSCREEN);
@@ skipping 41 matching lines @@
   squash2->SetPosition(gfx::PointF(220, 300));
   squash2->SetDrawsContent(true);
 
   scroll->test_properties()->AddChild(std::move(squash2));
   clip->test_properties()->AddChild(std::move(scroll));
   clip->test_properties()->AddChild(std::move(scrollbar));
   clip->test_properties()->AddChild(std::move(squash1));
   root->test_properties()->AddChild(std::move(clip));
 
   layer_tree_impl->SetRootLayerForTesting(std::move(root));
-  SetNeedsRebuildPropertyTrees();
-  RebuildPropertyTrees();
+  layer_tree_impl->BuildLayerListAndPropertyTreesForTesting();
   layer_tree_impl->DidBecomeActive();
 
   // The point hits squash1 layer and also scroll layer, because scroll layer is
   // not an ancestor of squash1 layer, we cannot scroll on impl thread.
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point(230, 150)).get(), InputHandler::WHEEL);
   EXPECT_EQ(InputHandler::SCROLL_UNKNOWN, status.thread);
   EXPECT_EQ(MainThreadScrollingReason::kFailedHitTest,
             status.main_thread_scrolling_reasons);
 
@@ skipping 11 matching lines @@
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD, status.thread);
 }
 
 TEST_F(LayerTreeHostImplTest, NonFastScrollableRegionBasic) {
   SetupScrollAndContentsLayers(gfx::Size(200, 200));
   host_impl_->SetViewportSize(gfx::Size(100, 100));
 
   LayerImpl* root = host_impl_->active_tree()->root_layer_for_testing();
   root->SetNonFastScrollableRegion(gfx::Rect(0, 0, 50, 50));
 
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   DrawFrame();
 
   // All scroll types inside the non-fast scrollable region should fail.
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point(25, 25)).get(), InputHandler::WHEEL);
   EXPECT_EQ(InputHandler::SCROLL_ON_MAIN_THREAD, status.thread);
   EXPECT_EQ(MainThreadScrollingReason::kNonFastScrollableRegion,
             status.main_thread_scrolling_reasons);
   EXPECT_FALSE(host_impl_->IsCurrentlyScrollingLayerAt(gfx::Point(25, 25),
                                                        InputHandler::WHEEL));
@@ skipping 32 matching lines @@
   host_impl_->ScrollBy(UpdateState(gfx::Point(), gfx::Vector2d(0, 10)).get());
   host_impl_->ScrollEnd(EndState().get());
   EXPECT_FALSE(host_impl_->IsCurrentlyScrollingLayerAt(
       gfx::Point(75, 75), InputHandler::TOUCHSCREEN));
 }
 
 TEST_F(LayerTreeHostImplTest, NonFastScrollableRegionWithOffset) {
   SetupScrollAndContentsLayers(gfx::Size(200, 200));
   host_impl_->SetViewportSize(gfx::Size(100, 100));
 
-  LayerImpl* root = host_impl_->active_tree()->root_layer_for_testing();
+  LayerImpl* root = *host_impl_->active_tree()->begin();
   root->SetNonFastScrollableRegion(gfx::Rect(0, 0, 50, 50));
   root->SetPosition(gfx::PointF(-25.f, 0.f));
   root->SetDrawsContent(true);
 
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   DrawFrame();
 
   // This point would fall into the non-fast scrollable region except that we've
   // moved the layer down by 25 pixels.
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point(40, 10)).get(), InputHandler::WHEEL);
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD, status.thread);
   EXPECT_EQ(MainThreadScrollingReason::kNotScrollingOnMain,
             status.main_thread_scrolling_reasons);
 
@@ skipping 119 matching lines @@
 
   DrawFrame();
 
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
                                     InputHandler::WHEEL)
                 .thread);
 
   // Trying to scroll if not user_scrollable_vertical will fail.
   host_impl_->InnerViewportScrollLayer()->set_user_scrollable_vertical(false);
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   DrawFrame();
   EXPECT_FALSE(host_impl_->ScrollVerticallyByPage(
       gfx::Point(), SCROLL_FORWARD));
   EXPECT_FALSE(host_impl_->ScrollVerticallyByPage(
       gfx::Point(), SCROLL_BACKWARD));
 
   host_impl_->InnerViewportScrollLayer()->set_user_scrollable_vertical(true);
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   DrawFrame();
   EXPECT_TRUE(host_impl_->ScrollVerticallyByPage(
       gfx::Point(), SCROLL_FORWARD));
   EXPECT_FLOAT_EQ(875.f,
                   ScrollDelta(host_impl_->InnerViewportScrollLayer()).y());
   EXPECT_TRUE(host_impl_->ScrollVerticallyByPage(
       gfx::Point(), SCROLL_BACKWARD));
 }
 
 TEST_F(LayerTreeHostImplTest, ScrollWithUserUnscrollableLayers) {
   LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(200, 200));
   host_impl_->SetViewportSize(gfx::Size(100, 100));
 
   gfx::Size overflow_size(400, 400);
   ASSERT_EQ(1u, scroll_layer->test_properties()->children.size());
   LayerImpl* overflow = scroll_layer->test_properties()->children[0];
   overflow->SetBounds(overflow_size);
   overflow->SetScrollClipLayer(
       scroll_layer->test_properties()->parent->test_properties()->parent->id());
   overflow->layer_tree_impl()
       ->property_trees()
       ->scroll_tree.UpdateScrollOffsetBaseForTesting(overflow->id(),
                                                      gfx::ScrollOffset());
   overflow->SetPosition(gfx::PointF());
 
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   DrawFrame();
   gfx::Point scroll_position(10, 10);
 
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_->ScrollBegin(BeginState(scroll_position).get(),
                                     InputHandler::WHEEL)
                 .thread);
   EXPECT_VECTOR_EQ(gfx::Vector2dF(), scroll_layer->CurrentScrollOffset());
   EXPECT_VECTOR_EQ(gfx::Vector2dF(), overflow->CurrentScrollOffset());
 
   gfx::Vector2dF scroll_delta(10, 10);
   host_impl_->ScrollBy(UpdateState(scroll_position, scroll_delta).get());
   host_impl_->ScrollEnd(EndState().get());
   EXPECT_VECTOR_EQ(gfx::Vector2dF(), scroll_layer->CurrentScrollOffset());
   EXPECT_VECTOR_EQ(gfx::Vector2dF(10, 10), overflow->CurrentScrollOffset());
 
   overflow->set_user_scrollable_horizontal(false);
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   DrawFrame();
 
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_->ScrollBegin(BeginState(scroll_position).get(),
                                     InputHandler::WHEEL)
                 .thread);
   EXPECT_VECTOR_EQ(gfx::Vector2dF(), scroll_layer->CurrentScrollOffset());
   EXPECT_VECTOR_EQ(gfx::Vector2dF(10, 10), overflow->CurrentScrollOffset());
 
   host_impl_->ScrollBy(UpdateState(scroll_position, scroll_delta).get());
   host_impl_->ScrollEnd(EndState().get());
   EXPECT_VECTOR_EQ(gfx::Vector2dF(0, 0), scroll_layer->CurrentScrollOffset());
   EXPECT_VECTOR_EQ(gfx::Vector2dF(10, 20), overflow->CurrentScrollOffset());
 
   overflow->set_user_scrollable_vertical(false);
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   DrawFrame();
 
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_->ScrollBegin(BeginState(scroll_position).get(),
                                     InputHandler::WHEEL)
                 .thread);
   EXPECT_VECTOR_EQ(gfx::Vector2dF(0, 0), scroll_layer->CurrentScrollOffset());
   EXPECT_VECTOR_EQ(gfx::Vector2dF(10, 20), overflow->CurrentScrollOffset());
 
   host_impl_->ScrollBy(UpdateState(scroll_position, scroll_delta).get());
   host_impl_->ScrollEnd(EndState().get());
   EXPECT_VECTOR_EQ(gfx::Vector2dF(10, 10), scroll_layer->CurrentScrollOffset());
   EXPECT_VECTOR_EQ(gfx::Vector2dF(10, 20), overflow->CurrentScrollOffset());
 }
 
 TEST_F(LayerTreeHostImplTest, AnimationSchedulingPendingTree) {
   EXPECT_FALSE(host_impl_->CommitToActiveTree());
 
   host_impl_->SetViewportSize(gfx::Size(50, 50));
 
   host_impl_->CreatePendingTree();
-  host_impl_->pending_tree()->SetRootLayerForTesting(
-      LayerImpl::Create(host_impl_->pending_tree(), 1));
-  LayerImpl* root = host_impl_->pending_tree()->root_layer_for_testing();
+  auto root_owned = LayerImpl::Create(host_impl_->pending_tree(), 1);
+  auto* root = root_owned.get();
+  host_impl_->pending_tree()->SetRootLayerForTesting(std::move(root_owned));
   root->SetBounds(gfx::Size(50, 50));
   root->test_properties()->force_render_surface = true;
 
   root->test_properties()->AddChild(
       LayerImpl::Create(host_impl_->pending_tree(), 2));
-  host_impl_->pending_tree()->BuildLayerListForTesting();
   LayerImpl* child = root->test_properties()->children[0];
   child->SetBounds(gfx::Size(10, 10));
   child->draw_properties().visible_layer_rect = gfx::Rect(10, 10);
   child->SetDrawsContent(true);
 
   host_impl_->pending_tree()->SetElementIdsForTesting();
 
   AddAnimatedTransformToElementWithPlayer(child->element_id(), timeline(), 10.0,
                                           3, 0);
 
@@ skipping 29 matching lines @@
   EXPECT_FALSE(did_request_commit_);
 }
 
 TEST_F(LayerTreeHostImplTest, AnimationSchedulingActiveTree) {
   EXPECT_FALSE(host_impl_->CommitToActiveTree());
 
   host_impl_->SetViewportSize(gfx::Size(50, 50));
 
   host_impl_->active_tree()->SetRootLayerForTesting(
       LayerImpl::Create(host_impl_->active_tree(), 1));
-  LayerImpl* root = host_impl_->active_tree()->root_layer_for_testing();
+  LayerImpl* root = *host_impl_->active_tree()->begin();
   root->SetBounds(gfx::Size(50, 50));
   root->test_properties()->force_render_surface = true;
 
   root->test_properties()->AddChild(
       LayerImpl::Create(host_impl_->active_tree(), 2));
   LayerImpl* child = root->test_properties()->children[0];
   child->SetBounds(gfx::Size(10, 10));
   child->draw_properties().visible_layer_rect = gfx::Rect(10, 10);
   child->SetDrawsContent(true);
 
@@ skipping 44 matching lines @@
 }
 
 TEST_F(LayerTreeHostImplTest, AnimationSchedulingCommitToActiveTree) {
   FakeImplTaskRunnerProvider provider(nullptr);
   CreateHostImplWithTaskRunnerProvider(DefaultSettings(), CreateOutputSurface(),
                                        &provider);
   EXPECT_TRUE(host_impl_->CommitToActiveTree());
 
   host_impl_->SetViewportSize(gfx::Size(50, 50));
 
-  host_impl_->active_tree()->SetRootLayerForTesting(
-      LayerImpl::Create(host_impl_->active_tree(), 1));
-  LayerImpl* root = host_impl_->active_tree()->root_layer_for_testing();
+  auto root_owned = LayerImpl::Create(host_impl_->active_tree(), 1);
+  auto* root = root_owned.get();
+  host_impl_->active_tree()->SetRootLayerForTesting(std::move(root_owned));
   root->SetBounds(gfx::Size(50, 50));
   root->SetHasRenderSurface(true);
 
-  root->test_properties()->AddChild(
-      LayerImpl::Create(host_impl_->active_tree(), 2));
-  LayerImpl* child = root->test_properties()->children[0];
+  auto child_owned = LayerImpl::Create(host_impl_->active_tree(), 2);
+  auto* child = child_owned.get();
+  root->test_properties()->AddChild(std::move(child_owned));
   child->SetBounds(gfx::Size(10, 10));
   child->draw_properties().visible_layer_rect = gfx::Rect(10, 10);
   child->SetDrawsContent(true);
 
   host_impl_->active_tree()->SetElementIdsForTesting();
 
   AddAnimatedTransformToElementWithPlayer(child->element_id(), timeline(), 10.0,
                                           3, 0);
 
   // Set up the property trees so that UpdateDrawProperties will work in
@@ skipping 17 matching lines @@
 
   // Delete the LayerTreeHostImpl before the TaskRunnerProvider goes away.
   host_impl_ = nullptr;
 }
 
 TEST_F(LayerTreeHostImplTest, AnimationSchedulingOnLayerDestruction) {
   host_impl_->SetViewportSize(gfx::Size(50, 50));
 
   host_impl_->active_tree()->SetRootLayerForTesting(
       LayerImpl::Create(host_impl_->active_tree(), 1));
-  LayerImpl* root = host_impl_->active_tree()->root_layer_for_testing();
+  LayerImpl* root = *host_impl_->active_tree()->begin();
   root->SetBounds(gfx::Size(50, 50));
 
   root->test_properties()->AddChild(
       LayerImpl::Create(host_impl_->active_tree(), 2));
   LayerImpl* child = root->test_properties()->children[0];
   child->SetBounds(gfx::Size(10, 10));
   child->draw_properties().visible_layer_rect = gfx::Rect(10, 10);
   child->SetDrawsContent(true);
 
   host_impl_->active_tree()->SetElementIdsForTesting();
@@ skipping 54 matching lines @@
 
  private:
   bool has_missing_tiles_;
 };
 
 TEST_F(LayerTreeHostImplTest, AnimationMarksLayerNotReady) {
   host_impl_->SetViewportSize(gfx::Size(50, 50));
 
   host_impl_->active_tree()->SetRootLayerForTesting(
       LayerImpl::Create(host_impl_->active_tree(), 1));
-  LayerImpl* root = host_impl_->active_tree()->root_layer_for_testing();
+  LayerImpl* root = *host_impl_->active_tree()->begin();
   root->SetBounds(gfx::Size(50, 50));
   root->SetHasRenderSurface(true);
 
   root->test_properties()->AddChild(std::unique_ptr<MissingTilesLayer>(
       new MissingTilesLayer(host_impl_->active_tree(), 2)));
   MissingTilesLayer* child =
       static_cast<MissingTilesLayer*>(root->test_properties()->children[0]);
   child->SetBounds(gfx::Size(10, 10));
   child->draw_properties().visible_layer_rect = gfx::Rect(10, 10);
   child->SetDrawsContent(true);
@@ skipping 12 matching lines @@
 
   base::TimeTicks now = base::TimeTicks::Now();
   host_impl_->WillBeginImplFrame(
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE, now));
 
   host_impl_->ActivateAnimations();
   host_impl_->Animate();
 
   EXPECT_FALSE(child->was_ever_ready_since_last_transform_animation());
 
-  host_impl_->active_tree()->property_trees()->needs_rebuild = true;
   host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   host_impl_->ResetRequiresHighResToDraw();
 
   // Child layer has an animating transform but missing tiles.
   FakeLayerTreeHostImpl::FrameData frame;
   DrawResult result = host_impl_->PrepareToDraw(&frame);
   EXPECT_EQ(DRAW_ABORTED_CHECKERBOARD_ANIMATIONS, result);
   host_impl_->DidDrawAllLayers(frame);
 
   child->set_has_missing_tiles(false);
@@ skipping 30 matching lines @@
   // Child layer doesn't have an animation, and was ready at least once since
   // the last time it animated.
   result = host_impl_->PrepareToDraw(&frame);
   EXPECT_EQ(DRAW_SUCCESS, result);
   EXPECT_TRUE(child->was_ever_ready_since_last_transform_animation());
   host_impl_->DidDrawAllLayers(frame);
 }
 
 TEST_F(LayerTreeHostImplTest, ImplPinchZoom) {
   LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 100));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   host_impl_->SetViewportSize(gfx::Size(50, 50));
   DrawFrame();
 
   EXPECT_EQ(scroll_layer, host_impl_->InnerViewportScrollLayer());
   LayerImpl* container_layer = scroll_layer->scroll_clip_layer();
   EXPECT_EQ(gfx::Size(50, 50), container_layer->bounds());
 
   float min_page_scale = 1.f, max_page_scale = 4.f;
   float page_scale_factor = 1.f;
 
@@ skipping 64 matching lines @@
   host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 0.25f, 4.f);
 
   const gfx::Size content_size(1000, 1000);
   const gfx::Size viewport_size(500, 500);
   CreateBasicVirtualViewportLayers(viewport_size, content_size);
 
   LayerImpl* outer_scroll_layer = host_impl_->OuterViewportScrollLayer();
   outer_scroll_layer->SetDrawsContent(true);
   LayerImpl* inner_scroll_layer = host_impl_->InnerViewportScrollLayer();
   inner_scroll_layer->SetDrawsContent(true);
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   EXPECT_VECTOR_EQ(
       gfx::Vector2dF(500, 500),
       outer_scroll_layer->MaxScrollOffset());
 
-  RebuildPropertyTrees();
   host_impl_->ScrollBegin(BeginState(gfx::Point(250, 250)).get(),
                           InputHandler::TOUCHSCREEN);
   host_impl_->PinchGestureBegin();
   host_impl_->PinchGestureUpdate(2.f, gfx::Point(0, 0));
   host_impl_->PinchGestureEnd();
   host_impl_->ScrollEnd(EndState().get());
 
   // Sanity check - we're zoomed in, starting from the origin.
   EXPECT_VECTOR_EQ(
       gfx::Vector2dF(0, 0),
@@ skipping 40 matching lines @@
   host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 1.f, 2.f);
 
   const gfx::Size content_size(1000, 1000);
   const gfx::Size viewport_size(500, 500);
   CreateBasicVirtualViewportLayers(viewport_size, content_size);
 
   LayerImpl* outer_scroll_layer = host_impl_->OuterViewportScrollLayer();
   outer_scroll_layer->SetDrawsContent(true);
   LayerImpl* inner_scroll_layer = host_impl_->InnerViewportScrollLayer();
   inner_scroll_layer->SetDrawsContent(true);
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   // Sanity checks.
   EXPECT_VECTOR_EQ(
       gfx::Vector2dF(500, 500),
       outer_scroll_layer->MaxScrollOffset());
   EXPECT_VECTOR_EQ(gfx::Vector2dF(), outer_scroll_layer->CurrentScrollOffset());
   EXPECT_VECTOR_EQ(gfx::Vector2dF(), inner_scroll_layer->CurrentScrollOffset());
 
-  RebuildPropertyTrees();
-
   // Scroll only the layout viewport.
   host_impl_->ScrollBegin(BeginState(gfx::Point(250, 250)).get(),
                           InputHandler::TOUCHSCREEN);
   host_impl_->ScrollBy(
       UpdateState(gfx::Point(250, 250), gfx::Vector2dF(0.125f, 0.125f)).get());
   EXPECT_VECTOR2DF_EQ(
       gfx::Vector2dF(0.125f, 0.125f),
       outer_scroll_layer->CurrentScrollOffset());
   EXPECT_VECTOR2DF_EQ(
       gfx::Vector2dF(0, 0),
@@ skipping 26 matching lines @@
   host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 1.f, 2.f);
 
   const gfx::Size content_size(1000, 1000);
   const gfx::Size viewport_size(500, 500);
   CreateBasicVirtualViewportLayers(viewport_size, content_size);
 
   LayerImpl* outer_scroll_layer = host_impl_->OuterViewportScrollLayer();
   outer_scroll_layer->SetDrawsContent(true);
   LayerImpl* inner_scroll_layer = host_impl_->InnerViewportScrollLayer();
   inner_scroll_layer->SetDrawsContent(true);
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   EXPECT_VECTOR_EQ(
       gfx::Vector2dF(500, 500),
       outer_scroll_layer->MaxScrollOffset());
 
-  RebuildPropertyTrees();
   host_impl_->ScrollBegin(BeginState(gfx::Point(250, 250)).get(),
                           InputHandler::TOUCHSCREEN);
   host_impl_->PinchGestureBegin();
 
   host_impl_->PinchGestureUpdate(2, gfx::Point(250, 250));
   EXPECT_VECTOR_EQ(
       gfx::Vector2dF(0, 0),
       outer_scroll_layer->CurrentScrollOffset());
   EXPECT_VECTOR_EQ(
       gfx::Vector2dF(125, 125),
@@ skipping 38 matching lines @@
   const gfx::Size content_size(1000, 1000);
   const gfx::Size viewport_size(500, 500);
   CreateBasicVirtualViewportLayers(viewport_size, content_size);
 
   int offsetFromEdge = Viewport::kPinchZoomSnapMarginDips - 5;
   gfx::Point anchor(viewport_size.width() - offsetFromEdge,
                     viewport_size.height() - offsetFromEdge);
 
   // Pinch in within the margins. The scroll should stay exactly locked to the
   // bottom and right.
-  RebuildPropertyTrees();
   host_impl_->ScrollBegin(BeginState(anchor).get(), InputHandler::TOUCHSCREEN);
   host_impl_->PinchGestureBegin();
   host_impl_->PinchGestureUpdate(2, anchor);
   host_impl_->PinchGestureEnd();
   host_impl_->ScrollEnd(EndState().get());
 
   EXPECT_VECTOR_EQ(
       gfx::Vector2dF(250, 250),
       host_impl_->InnerViewportScrollLayer()->CurrentScrollOffset());
 
@@ skipping 57 matching lines @@
   const gfx::Size content_size(200, 200);
   const gfx::Size viewport_size(100, 100);
   CreateBasicVirtualViewportLayers(viewport_size, content_size);
 
   LayerImpl* outer_scroll_layer = host_impl_->OuterViewportScrollLayer();
   LayerImpl* inner_scroll_layer = host_impl_->InnerViewportScrollLayer();
 
   // Zoom into the page by a 2X factor
   float min_page_scale = 1.f, max_page_scale = 4.f;
   float page_scale_factor = 2.f;
-  RebuildPropertyTrees();
   host_impl_->active_tree()->PushPageScaleFromMainThread(
       page_scale_factor, min_page_scale, max_page_scale);
   host_impl_->active_tree()->SetPageScaleOnActiveTree(page_scale_factor);
 
   // Scroll by a small amount, there should be no bubbling to the outer
   // viewport.
   host_impl_->ScrollBegin(BeginState(gfx::Point(0, 0)).get(),
                           InputHandler::WHEEL);
   host_impl_->ScrollBy(
       UpdateState(gfx::Point(0, 0), gfx::Vector2dF(10.f, 20.f)).get());
@@ skipping 93 matching lines @@
 
   child_clip = scroll_child_clip.get();
   viewport_scroll->test_properties()->AddChild(std::move(scroll_child_clip));
 
   child_clip->test_properties()->scroll_parent = parent;
   std::unique_ptr<std::set<LayerImpl*>> scroll_children(
       new std::set<LayerImpl*>);
   scroll_children->insert(child_clip);
   parent->test_properties()->scroll_children.reset(scroll_children.release());
 
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   DrawFrame();
 
   {
     host_impl_->ScrollBegin(BeginState(gfx::Point(21, 21)).get(),
                             InputHandler::TOUCHSCREEN);
     host_impl_->ScrollBy(
         UpdateState(gfx::Point(21, 21), gfx::Vector2d(5, 5)).get());
     host_impl_->ScrollBy(
         UpdateState(gfx::Point(21, 21), gfx::Vector2d(100, 100)).get());
     host_impl_->ScrollEnd(EndState().get());
@@ skipping 397 matching lines @@
 }
 
 TEST_F(LayerTreeHostImplTest, PageScaleAnimationTransferedOnSyncTreeActivate) {
   host_impl_->CreatePendingTree();
   host_impl_->pending_tree()->PushPageScaleFromMainThread(1.f, 1.f, 1.f);
   CreateScrollAndContentsLayers(
       host_impl_->pending_tree(),
       gfx::Size(100, 100));
   host_impl_->pending_tree()->BuildLayerListAndPropertyTreesForTesting();
   host_impl_->ActivateSyncTree();
-  host_impl_->active_tree()->SetRootLayerFromLayerListForTesting();
   DrawFrame();
 
   LayerImpl* scroll_layer = host_impl_->InnerViewportScrollLayer();
   DCHECK(scroll_layer);
 
   float min_page_scale = 0.5f;
   float max_page_scale = 4.f;
   host_impl_->sync_tree()->PushPageScaleFromMainThread(1.f, min_page_scale,
                                                        max_page_scale);
   host_impl_->ActivateSyncTree();
@@ skipping 144 matching lines @@
   host_impl_->WillBeginImplFrame(begin_frame_args);
   host_impl_->Animate();
   EXPECT_TRUE(did_complete_page_scale_animation_);
   host_impl_->DidFinishImplFrame();
 }
 
 TEST_F(LayerTreeHostImplTest, MaxScrollOffsetAffectedByBoundsDelta) {
   SetupScrollAndContentsLayers(gfx::Size(100, 100));
   host_impl_->SetViewportSize(gfx::Size(50, 50));
   host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 0.5f, 4.f);
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   DrawFrame();
 
   LayerImpl* inner_scroll = host_impl_->InnerViewportScrollLayer();
   LayerImpl* inner_container = inner_scroll->scroll_clip_layer();
   DCHECK(inner_scroll);
   DCHECK(inner_container);
   EXPECT_EQ(gfx::ScrollOffset(50, 50), inner_scroll->MaxScrollOffset());
 
   inner_container->SetBoundsDelta(gfx::Vector2dF(15.f, 15.f));
   inner_scroll->SetBoundsDelta(gfx::Vector2dF(7.f, 7.f));
   EXPECT_EQ(gfx::ScrollOffset(42, 42), inner_scroll->MaxScrollOffset());
 
   inner_container->SetBoundsDelta(gfx::Vector2dF());
   inner_scroll->SetBoundsDelta(gfx::Vector2dF());
   inner_scroll->SetBounds(gfx::Size());
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   DrawFrame();
 
   inner_scroll->SetBoundsDelta(gfx::Vector2dF(60.f, 60.f));
   EXPECT_EQ(gfx::ScrollOffset(10, 10), inner_scroll->MaxScrollOffset());
 }
 
 class LayerTreeHostImplOverridePhysicalTime : public LayerTreeHostImpl {
  public:
   LayerTreeHostImplOverridePhysicalTime(
       const LayerTreeSettings& settings,
@@ skipping 49 matching lines @@
                                              VERTICAL, 10, 0, false, true);
     scrollbar->test_properties()->opacity = 0.f;
     EXPECT_FLOAT_EQ(0.f, scrollbar->test_properties()->opacity);
 
     LayerImpl* scroll = host_impl_->active_tree()->OuterViewportScrollLayer();
     LayerImpl* root = host_impl_->active_tree()->InnerViewportContainerLayer();
     scrollbar->SetScrollLayerId(scroll->id());
     root->test_properties()->AddChild(std::move(scrollbar));
 
     host_impl_->active_tree()->DidBecomeActive();
-    SetNeedsRebuildPropertyTrees();
+    host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
     DrawFrame();
   }
 
   void RunTest(LayerTreeSettings::ScrollbarAnimator animator) {
     LayerTreeSettings settings = DefaultSettings();
     settings.scrollbar_animator = animator;
     settings.scrollbar_fade_delay_ms = 20;
     settings.scrollbar_fade_duration_ms = 20;
 
     SetupLayers(settings);
@@ skipping 186 matching lines @@
     host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
                             InputHandler::WHEEL);
     host_impl_->ScrollBy(UpdateState(gfx::Point(), gfx::Vector2dF(0, 5)).get());
     host_impl_->ScrollEnd(EndState().get());
     host_impl_->CreatePendingTree();
     // To test the case where the effect tree index of scrollbar layer changes,
     // we force the container layer to create a render surface.
     container = host_impl_->pending_tree()->InnerViewportContainerLayer();
     container->test_properties()->force_render_surface = true;
     container->SetBounds(gfx::Size(10, 10));
-    host_impl_->pending_tree()->property_trees()->needs_rebuild = true;
     host_impl_->pending_tree()->BuildLayerListAndPropertyTreesForTesting();
 
     LayerImpl* pending_scrollbar_layer =
         host_impl_->pending_tree()->LayerById(400);
     EffectNode* pending_tree_node =
         host_impl_->pending_tree()->property_trees()->effect_tree.Node(
             pending_scrollbar_layer->effect_tree_index());
     host_impl_->pending_tree()
         ->property_trees()
         ->always_use_active_tree_opacity_effect_ids.push_back(400);
@@ skipping 198 matching lines @@
       SolidColorScrollbarLayerImpl::Create(host_impl_->active_tree(), 6,
                                            VERTICAL, 5, 5, true, true);
   scrollbar->SetScrollLayerId(root_scroll->id());
   scrollbar->SetDrawsContent(true);
   scrollbar->SetBounds(scrollbar_size);
   scrollbar->SetTouchEventHandlerRegion(gfx::Rect(scrollbar_size));
   host_impl_->active_tree()
       ->InnerViewportContainerLayer()
       ->test_properties()
       ->AddChild(std::move(scrollbar));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
   host_impl_->active_tree()->DidBecomeActive();
 
   DrawFrame();
   host_impl_->active_tree()->UpdateDrawProperties(false);
 
   ScrollbarAnimationControllerThinning* scrollbar_animation_controller =
       static_cast<ScrollbarAnimationControllerThinning*>(
           host_impl_->ScrollbarAnimationControllerForId(root_scroll->id()));
   scrollbar_animation_controller->set_mouse_move_distance_for_test(100.f);
 
@@ skipping 212 matching lines @@
   bool will_draw_called_;
   bool append_quads_called_;
   bool did_draw_called_;
 };
 
 TEST_F(LayerTreeHostImplTest, WillDrawReturningFalseDoesNotCall) {
   // The root layer is always drawn, so run this test on a child layer that
   // will be masked out by the root layer's bounds.
   host_impl_->active_tree()->SetRootLayerForTesting(
       DidDrawCheckLayer::Create(host_impl_->active_tree(), 1));
-  DidDrawCheckLayer* root = static_cast<DidDrawCheckLayer*>(
-      host_impl_->active_tree()->root_layer_for_testing());
+  DidDrawCheckLayer* root =
+      static_cast<DidDrawCheckLayer*>(*host_impl_->active_tree()->begin());
 
   root->test_properties()->AddChild(
       DidDrawCheckLayer::Create(host_impl_->active_tree(), 2));
   root->test_properties()->force_render_surface = true;
   DidDrawCheckLayer* layer =
       static_cast<DidDrawCheckLayer*>(root->test_properties()->children[0]);
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   {
     LayerTreeHostImpl::FrameData frame;
-    EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
     host_impl_->DrawLayers(&frame);
     host_impl_->DidDrawAllLayers(frame);
 
     EXPECT_TRUE(layer->will_draw_called());
     EXPECT_TRUE(layer->append_quads_called());
     EXPECT_TRUE(layer->did_draw_called());
   }
 
   host_impl_->SetViewportDamage(gfx::Rect(10, 10));
 
   {
     LayerTreeHostImpl::FrameData frame;
 
     layer->set_will_draw_returns_false();
     layer->ClearDidDrawCheck();
 
-    EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
     host_impl_->DrawLayers(&frame);
     host_impl_->DidDrawAllLayers(frame);
 
     EXPECT_TRUE(layer->will_draw_called());
     EXPECT_FALSE(layer->append_quads_called());
     EXPECT_FALSE(layer->did_draw_called());
   }
 }
 
 TEST_F(LayerTreeHostImplTest, DidDrawNotCalledOnHiddenLayer) {
   // The root layer is always drawn, so run this test on a child layer that
   // will be masked out by the root layer's bounds.
   host_impl_->active_tree()->SetRootLayerForTesting(
       DidDrawCheckLayer::Create(host_impl_->active_tree(), 1));
-  DidDrawCheckLayer* root = static_cast<DidDrawCheckLayer*>(
-      host_impl_->active_tree()->root_layer_for_testing());
+  DidDrawCheckLayer* root =
+      static_cast<DidDrawCheckLayer*>(*host_impl_->active_tree()->begin());
   root->SetMasksToBounds(true);
   root->test_properties()->force_render_surface = true;
   root->test_properties()->AddChild(
       DidDrawCheckLayer::Create(host_impl_->active_tree(), 2));
   DidDrawCheckLayer* layer =
       static_cast<DidDrawCheckLayer*>(root->test_properties()->children[0]);
   // Ensure visible_layer_rect for layer is empty.
   layer->SetPosition(gfx::PointF(100.f, 100.f));
   layer->SetBounds(gfx::Size(10, 10));
 
   LayerTreeHostImpl::FrameData frame;
 
   EXPECT_FALSE(layer->will_draw_called());
   EXPECT_FALSE(layer->did_draw_called());
 
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
 
   EXPECT_FALSE(layer->will_draw_called());
   EXPECT_FALSE(layer->did_draw_called());
 
   EXPECT_TRUE(layer->visible_layer_rect().IsEmpty());
 
   // Ensure visible_layer_rect for layer is not empty
   layer->SetPosition(gfx::PointF());
   layer->NoteLayerPropertyChanged();
 
   EXPECT_FALSE(layer->will_draw_called());
   EXPECT_FALSE(layer->did_draw_called());
 
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
 
   EXPECT_TRUE(layer->will_draw_called());
   EXPECT_TRUE(layer->did_draw_called());
 
   EXPECT_FALSE(layer->visible_layer_rect().IsEmpty());
 }
 
 TEST_F(LayerTreeHostImplTest, WillDrawNotCalledOnOccludedLayer) {
   gfx::Size big_size(1000, 1000);
   host_impl_->SetViewportSize(big_size);
 
   host_impl_->active_tree()->SetRootLayerForTesting(
       DidDrawCheckLayer::Create(host_impl_->active_tree(), 1));
-  DidDrawCheckLayer* root = static_cast<DidDrawCheckLayer*>(
-      host_impl_->active_tree()->root_layer_for_testing());
+  DidDrawCheckLayer* root =
+      static_cast<DidDrawCheckLayer*>(*host_impl_->active_tree()->begin());
 
   root->test_properties()->AddChild(
       DidDrawCheckLayer::Create(host_impl_->active_tree(), 2));
   DidDrawCheckLayer* occluded_layer =
       static_cast<DidDrawCheckLayer*>(root->test_properties()->children[0]);
 
   root->test_properties()->AddChild(
       DidDrawCheckLayer::Create(host_impl_->active_tree(), 3));
   root->test_properties()->force_render_surface = true;
   DidDrawCheckLayer* top_layer =
       static_cast<DidDrawCheckLayer*>(root->test_properties()->children[1]);
   // This layer covers the occluded_layer above. Make this layer large so it can
   // occlude.
   top_layer->SetBounds(big_size);
   top_layer->SetContentsOpaque(true);
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   LayerTreeHostImpl::FrameData frame;
 
   EXPECT_FALSE(occluded_layer->will_draw_called());
   EXPECT_FALSE(occluded_layer->did_draw_called());
   EXPECT_FALSE(top_layer->will_draw_called());
   EXPECT_FALSE(top_layer->did_draw_called());
 
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
 
   EXPECT_FALSE(occluded_layer->will_draw_called());
   EXPECT_FALSE(occluded_layer->did_draw_called());
   EXPECT_TRUE(top_layer->will_draw_called());
   EXPECT_TRUE(top_layer->did_draw_called());
 }
 
 TEST_F(LayerTreeHostImplTest, DidDrawCalledOnAllLayers) {
   host_impl_->active_tree()->SetRootLayerForTesting(
       DidDrawCheckLayer::Create(host_impl_->active_tree(), 1));
-  DidDrawCheckLayer* root = static_cast<DidDrawCheckLayer*>(
-      host_impl_->active_tree()->root_layer_for_testing());
+  DidDrawCheckLayer* root =
+      static_cast<DidDrawCheckLayer*>(*host_impl_->active_tree()->begin());
 
   root->test_properties()->AddChild(
       DidDrawCheckLayer::Create(host_impl_->active_tree(), 2));
   root->test_properties()->force_render_surface = true;
   DidDrawCheckLayer* layer1 =
       static_cast<DidDrawCheckLayer*>(root->test_properties()->children[0]);
 
   layer1->test_properties()->AddChild(
       DidDrawCheckLayer::Create(host_impl_->active_tree(), 3));
   DidDrawCheckLayer* layer2 =
       static_cast<DidDrawCheckLayer*>(layer1->test_properties()->children[0]);
 
   layer1->test_properties()->force_render_surface = true;
   layer1->test_properties()->should_flatten_transform = true;
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   EXPECT_FALSE(root->did_draw_called());
   EXPECT_FALSE(layer1->did_draw_called());
   EXPECT_FALSE(layer2->did_draw_called());
 
   LayerTreeHostImpl::FrameData frame;
   FakeLayerTreeHostImpl::RecursiveUpdateNumChildren(
-      host_impl_->active_tree()->root_layer_for_testing());
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+      *host_impl_->active_tree()->begin());
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
 
   EXPECT_TRUE(root->did_draw_called());
   EXPECT_TRUE(layer1->did_draw_called());
   EXPECT_TRUE(layer2->did_draw_called());
 
   EXPECT_NE(root->render_surface(), layer1->render_surface());
   EXPECT_TRUE(layer1->render_surface());
 }
@@ skipping 127 matching lines @@
   // 16. High res required is higher priority than animating missing tiles.
   cases.push_back(
       PrepareToDrawSuccessTestCase(DRAW_ABORTED_MISSING_HIGH_RES_CONTENT));
   cases.back().high_res_required = true;
   cases.back().layer_between.has_missing_tile = true;
   cases.back().layer_before.has_missing_tile = true;
   cases.back().layer_before.is_animating = true;
 
   host_impl_->active_tree()->SetRootLayerForTesting(
       DidDrawCheckLayer::Create(host_impl_->active_tree(), 1));
-  DidDrawCheckLayer* root = static_cast<DidDrawCheckLayer*>(
-      host_impl_->active_tree()->root_layer_for_testing());
+  DidDrawCheckLayer* root =
+      static_cast<DidDrawCheckLayer*>(*host_impl_->active_tree()->begin());
   root->test_properties()->force_render_surface = true;
 
   LayerTreeHostImpl::FrameData frame;
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
   host_impl_->SwapBuffers(frame);
 
   for (size_t i = 0; i < cases.size(); ++i) {
     // Clean up host_impl_ state.
     const auto& testcase = cases[i];
     std::vector<LayerImpl*> to_remove;
     for (const auto& child : root->test_properties()->children)
       to_remove.push_back(child);
@@ skipping 27 matching lines @@
 
     root->test_properties()->AddChild(MissingTextureAnimatingLayer::Create(
         host_impl_->active_tree(), 4, testcase.layer_after.has_missing_tile,
         testcase.layer_after.has_incomplete_tile,
         testcase.layer_after.is_animating, host_impl_->resource_provider(),
         timeline()));
     DidDrawCheckLayer* after = static_cast<DidDrawCheckLayer*>(
         root->test_properties()->children.back());
     if (testcase.layer_after.has_copy_request)
       after->AddCopyRequest();
+    host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
     if (testcase.high_res_required)
       host_impl_->SetRequiresHighResToDraw();
 
     LayerTreeHostImpl::FrameData frame;
-    SetNeedsRebuildPropertyTrees();
-    EXPECT_EQ(testcase.expected_result, PrepareToDrawFrame(&frame));
+    EXPECT_EQ(testcase.expected_result, host_impl_->PrepareToDraw(&frame));
     host_impl_->DrawLayers(&frame);
     host_impl_->DidDrawAllLayers(frame);
     host_impl_->SwapBuffers(frame);
   }
 }
 
 TEST_F(LayerTreeHostImplTest,
        PrepareToDrawWhenDrawAndSwapFullViewportEveryFrame) {
   CreateHostImpl(DefaultSettings(),
                  FakeOutputSurface::CreateSoftware(
@@ skipping 21 matching lines @@
   // 3. High res required with missing tile.
   cases.push_back(PrepareToDrawSuccessTestCase(DRAW_SUCCESS));
   cases.back().high_res_required = true;
   cases.back().layer_between.has_missing_tile = true;
 
   host_impl_->active_tree()->SetRootLayerForTesting(
       DidDrawCheckLayer::Create(host_impl_->active_tree(), 1));
   DidDrawCheckLayer* root = static_cast<DidDrawCheckLayer*>(
       host_impl_->active_tree()->root_layer_for_testing());
   root->test_properties()->force_render_surface = true;
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
-  SetNeedsRebuildPropertyTrees();
   host_impl_->OnDraw(external_transform, external_viewport, external_clip,
                      resourceless_software_draw);
 
   for (size_t i = 0; i < cases.size(); ++i) {
     const auto& testcase = cases[i];
     std::vector<LayerImpl*> to_remove;
     for (const auto& child : root->test_properties()->children)
       to_remove.push_back(child);
     for (auto* child : to_remove)
       root->test_properties()->RemoveChild(child);
@@ skipping 24 matching lines @@
 
     root->test_properties()->AddChild(MissingTextureAnimatingLayer::Create(
         host_impl_->active_tree(), 4, testcase.layer_after.has_missing_tile,
         testcase.layer_after.has_incomplete_tile,
         testcase.layer_after.is_animating, host_impl_->resource_provider(),
         timeline()));
     DidDrawCheckLayer* after = static_cast<DidDrawCheckLayer*>(
         root->test_properties()->children.back());
     if (testcase.layer_after.has_copy_request)
       after->AddCopyRequest();
+    host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
     if (testcase.high_res_required)
       host_impl_->SetRequiresHighResToDraw();
 
-    SetNeedsRebuildPropertyTrees();
     host_impl_->OnDraw(external_transform, external_viewport, external_clip,
                        resourceless_software_draw);
   }
 }
 
 TEST_F(LayerTreeHostImplTest, ScrollRootIgnored) {
   std::unique_ptr<LayerImpl> root =
       LayerImpl::Create(host_impl_->active_tree(), 1);
   root->SetScrollClipLayer(Layer::INVALID_ID);
   root->test_properties()->force_render_surface = true;
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root));
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   DrawFrame();
 
   // Scroll event is ignored because layer is not scrollable.
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point()).get(), InputHandler::WHEEL);
   EXPECT_EQ(InputHandler::SCROLL_IGNORED, status.thread);
   EXPECT_EQ(MainThreadScrollingReason::kNoScrollingLayer,
             status.main_thread_scrolling_reasons);
   EXPECT_FALSE(did_request_redraw_);
   EXPECT_FALSE(did_request_commit_);
@@ skipping 132 matching lines @@
 
   LayerTreeImpl* active_tree = host_impl_->active_tree();
 
   // Create a content layer beneath the outer viewport scroll layer.
   int id = host_impl_->OuterViewportScrollLayer()->id();
   host_impl_->OuterViewportScrollLayer()->test_properties()->AddChild(
       LayerImpl::Create(host_impl_->active_tree(), id + 2));
   LayerImpl* content =
       active_tree->OuterViewportScrollLayer()->test_properties()->children[0];
   content->SetBounds(gfx::Size(50, 50));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   LayerImpl* inner_container = active_tree->InnerViewportContainerLayer();
   LayerImpl* outer_container = active_tree->OuterViewportContainerLayer();
 
   // The top controls should start off showing so the viewport should be shrunk.
   ASSERT_EQ(gfx::Size(50, 50), inner_container->bounds());
   ASSERT_EQ(gfx::Size(50, 50), outer_container->bounds());
 
   EXPECT_EQ(gfx::SizeF(50, 50), active_tree->ScrollableSize());
@@ skipping 283 matching lines @@
   child->test_properties()->is_container_for_fixed_position_layers = true;
 
   // scroll child to limit
   SetScrollOffsetDelta(child.get(), gfx::Vector2dF(0, 100.f));
   child_clip->test_properties()->AddChild(std::move(child));
   outer_viewport_scroll_layer->test_properties()->AddChild(
       std::move(child_clip));
 
   // Scroll 25px to hide top controls
   gfx::Vector2dF scroll_delta(0.f, 25.f);
-  host_impl_->active_tree()->property_trees()->needs_rebuild = true;
   host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_
                 ->ScrollBegin(BeginState(gfx::Point()).get(),
                               InputHandler::TOUCHSCREEN)
                 .thread);
   host_impl_->ScrollBy(UpdateState(gfx::Point(), scroll_delta).get());
   host_impl_->ScrollEnd(EndState().get());
 
   // Top controls should be hidden
@@ skipping 472 matching lines @@
       LayerImpl::Create(host_impl_->active_tree(), 2);
   scroll_layer->SetScrollClipLayer(3);
   scroll_layer->SetBounds(contents_size);
   scroll_layer->SetPosition(gfx::PointF());
   scroll_layer->test_properties()->AddChild(std::move(content_layer));
   scroll_clip_layer->test_properties()->AddChild(std::move(scroll_layer));
 
   scroll_clip_layer->test_properties()->force_render_surface = true;
   host_impl_->active_tree()->SetRootLayerForTesting(
       std::move(scroll_clip_layer));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   host_impl_->SetViewportSize(surface_size);
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_->ScrollBegin(BeginState(gfx::Point(5, 5)).get(),
                                     InputHandler::WHEEL)
                 .thread);
   host_impl_->ScrollBy(UpdateState(gfx::Point(), gfx::Vector2d(0, 10)).get());
   host_impl_->ScrollEnd(EndState().get());
   EXPECT_TRUE(did_request_redraw_);
   EXPECT_TRUE(did_request_commit_);
 }
 
 TEST_F(LayerTreeHostImplTest, ScrollChildCallsCommitAndRedraw) {
   gfx::Size surface_size(10, 10);
   gfx::Size contents_size(20, 20);
   std::unique_ptr<LayerImpl> root =
       LayerImpl::Create(host_impl_->active_tree(), 1);
   root->SetBounds(surface_size);
   root->test_properties()->AddChild(
       CreateScrollableLayer(2, contents_size, root.get()));
   root->test_properties()->force_render_surface = true;
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   host_impl_->SetViewportSize(surface_size);
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_->ScrollBegin(BeginState(gfx::Point(5, 5)).get(),
                                     InputHandler::WHEEL)
                 .thread);
   host_impl_->ScrollBy(UpdateState(gfx::Point(), gfx::Vector2d(0, 10)).get());
   host_impl_->ScrollEnd(EndState().get());
   EXPECT_TRUE(did_request_redraw_);
   EXPECT_TRUE(did_request_commit_);
 }
 
 TEST_F(LayerTreeHostImplTest, ScrollMissesChild) {
   gfx::Size surface_size(10, 10);
   std::unique_ptr<LayerImpl> root =
       LayerImpl::Create(host_impl_->active_tree(), 1);
   root->test_properties()->AddChild(
       CreateScrollableLayer(2, surface_size, root.get()));
   root->test_properties()->force_render_surface = true;
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   host_impl_->SetViewportSize(surface_size);
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   // Scroll event is ignored because the input coordinate is outside the layer
   // boundaries.
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point(15, 5)).get(), InputHandler::WHEEL);
   EXPECT_EQ(InputHandler::SCROLL_IGNORED, status.thread);
   EXPECT_EQ(MainThreadScrollingReason::kNoScrollingLayer,
             status.main_thread_scrolling_reasons);
 
   EXPECT_FALSE(did_request_redraw_);
   EXPECT_FALSE(did_request_commit_);
 }
 
 TEST_F(LayerTreeHostImplTest, ScrollMissesBackfacingChild) {
   gfx::Size surface_size(10, 10);
   std::unique_ptr<LayerImpl> root =
       LayerImpl::Create(host_impl_->active_tree(), 1);
   root->test_properties()->force_render_surface = true;
   std::unique_ptr<LayerImpl> child =
       CreateScrollableLayer(2, surface_size, root.get());
-  host_impl_->SetViewportSize(surface_size);
 
   gfx::Transform matrix;
   matrix.RotateAboutXAxis(180.0);
   child->SetTransform(matrix);
   child->test_properties()->double_sided = false;
 
   root->test_properties()->AddChild(std::move(child));
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root));
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
+  host_impl_->SetViewportSize(surface_size);
   DrawFrame();
 
   // Scroll event is ignored because the scrollable layer is not facing the
   // viewer and there is nothing scrollable behind it.
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point(5, 5)).get(), InputHandler::WHEEL);
   EXPECT_EQ(InputHandler::SCROLL_IGNORED, status.thread);
   EXPECT_EQ(MainThreadScrollingReason::kNoScrollingLayer,
             status.main_thread_scrolling_reasons);
 
@@ skipping 13 matching lines @@
 
   // Note: we can use the same clip layer for both since both calls to
   // CreateScrollableLayer() use the same surface size.
   std::unique_ptr<LayerImpl> scroll_layer =
       CreateScrollableLayer(2, surface_size, clip_layer.get());
   scroll_layer->test_properties()->AddChild(std::move(content_layer));
   clip_layer->test_properties()->AddChild(std::move(scroll_layer));
   clip_layer->test_properties()->force_render_surface = true;
 
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(clip_layer));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   host_impl_->SetViewportSize(surface_size);
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   // Scrolling fails because the content layer is asking to be scrolled on the
   // main thread.
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point(5, 5)).get(), InputHandler::WHEEL);
   EXPECT_EQ(InputHandler::SCROLL_ON_MAIN_THREAD, status.thread);
   EXPECT_EQ(MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects,
             status.main_thread_scrolling_reasons);
 }
@@ skipping 53 matching lines @@
   SetupScrollAndContentsLayers(viewport_size);
 
   // Setup the layers so that the outer viewport is scrollable.
   host_impl_->active_tree()
       ->InnerViewportScrollLayer()
       ->test_properties()
       ->parent->SetBounds(viewport_size);
   host_impl_->active_tree()->OuterViewportScrollLayer()->SetBounds(
       gfx::Size(40, 40));
   host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 1.f, 2.f);
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+
   DrawFrame();
 
   LayerImpl* root_scroll =
       host_impl_->active_tree()->OuterViewportScrollLayer();
   LayerImpl* inner_scroll =
       host_impl_->active_tree()->InnerViewportScrollLayer();
   EXPECT_EQ(viewport_size, root_scroll->scroll_clip_layer()->bounds());
 
   gfx::Vector2d scroll_delta(0, 10);
   gfx::Vector2d expected_scroll_delta = scroll_delta;
   gfx::ScrollOffset expected_max_scroll = root_scroll->MaxScrollOffset();
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_->ScrollBegin(BeginState(gfx::Point(5, 5)).get(),
                                     InputHandler::WHEEL)
                 .thread);
   host_impl_->ScrollBy(UpdateState(gfx::Point(), scroll_delta).get());
   host_impl_->ScrollEnd(EndState().get());
 
   // Set new page scale on impl thread by pinching.
   host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
                           InputHandler::TOUCHSCREEN);
   host_impl_->PinchGestureBegin();
   host_impl_->PinchGestureUpdate(page_scale, gfx::Point());
   host_impl_->PinchGestureEnd();
   host_impl_->ScrollEnd(EndState().get());
+
   DrawOneFrame();
 
   // The scroll delta is not scaled because the main thread did not scale.
   std::unique_ptr<ScrollAndScaleSet> scroll_info =
       host_impl_->ProcessScrollDeltas();
   EXPECT_TRUE(ScrollInfoContains(*scroll_info.get(), inner_scroll->id(),
                                  expected_scroll_delta));
 
   // The scroll range should also have been updated.
   EXPECT_EQ(expected_max_scroll, root_scroll->MaxScrollOffset());
@@ skipping 22 matching lines @@
 
   std::unique_ptr<LayerImpl> scrollable_child_clip =
       LayerImpl::Create(host_impl_->active_tree(), 6);
   std::unique_ptr<LayerImpl> scrollable_child =
       CreateScrollableLayer(7, surface_size, scrollable_child_clip.get());
   scrollable_child_clip->test_properties()->AddChild(
       std::move(scrollable_child));
   child->test_properties()->AddChild(std::move(scrollable_child_clip));
   LayerImpl* grand_child = child->test_properties()->children[0];
   grand_child->SetDrawsContent(true);
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   // Set new page scale on impl thread by pinching.
-  SetNeedsRebuildPropertyTrees();
-  RebuildPropertyTrees();
   host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
                           InputHandler::TOUCHSCREEN);
   host_impl_->PinchGestureBegin();
   host_impl_->PinchGestureUpdate(new_page_scale, gfx::Point());
   host_impl_->PinchGestureEnd();
   host_impl_->ScrollEnd(EndState().get());
   DrawOneFrame();
 
   // Make sure all the layers are drawn with the page scale delta applied, i.e.,
   // the page scale delta on the root layer is applied hierarchically.
   LayerTreeHostImpl::FrameData frame;
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
 
   EXPECT_EQ(1.f, root->DrawTransform().matrix().getDouble(0, 0));
   EXPECT_EQ(1.f, root->DrawTransform().matrix().getDouble(1, 1));
   EXPECT_EQ(new_page_scale, scroll->DrawTransform().matrix().getDouble(0, 0));
   EXPECT_EQ(new_page_scale, scroll->DrawTransform().matrix().getDouble(1, 1));
   EXPECT_EQ(new_page_scale, child->DrawTransform().matrix().getDouble(0, 0));
   EXPECT_EQ(new_page_scale, child->DrawTransform().matrix().getDouble(1, 1));
   EXPECT_EQ(new_page_scale,
             grand_child->DrawTransform().matrix().getDouble(0, 0));
   EXPECT_EQ(new_page_scale,
             grand_child->DrawTransform().matrix().getDouble(1, 1));
 }
 
 TEST_F(LayerTreeHostImplTest, ScrollChildAndChangePageScaleOnMainThread) {
   SetupScrollAndContentsLayers(gfx::Size(30, 30));
 
   LayerImpl* outer_scroll = host_impl_->OuterViewportScrollLayer();
   LayerImpl* inner_scroll = host_impl_->InnerViewportScrollLayer();
 
   // Make the outer scroll layer scrollable.
   outer_scroll->SetBounds(gfx::Size(50, 50));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
   DrawFrame();
 
   gfx::Vector2d scroll_delta(0, 10);
   gfx::Vector2d expected_scroll_delta(scroll_delta);
   gfx::ScrollOffset expected_max_scroll(outer_scroll->MaxScrollOffset());
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_->ScrollBegin(BeginState(gfx::Point(5, 5)).get(),
                                     InputHandler::WHEEL)
                 .thread);
   host_impl_->ScrollBy(UpdateState(gfx::Point(), scroll_delta).get());
   host_impl_->ScrollEnd(EndState().get());
 
   float page_scale = 2.f;
   host_impl_->active_tree()->PushPageScaleFromMainThread(page_scale, 1.f,
                                                          page_scale);
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
   DrawOneFrame();
 
   std::unique_ptr<ScrollAndScaleSet> scroll_info =
       host_impl_->ProcessScrollDeltas();
   EXPECT_TRUE(ScrollInfoContains(*scroll_info.get(), inner_scroll->id(),
                                  expected_scroll_delta));
 
   // The scroll range should not have changed.
   EXPECT_EQ(outer_scroll->MaxScrollOffset(), expected_max_scroll);
@@ skipping 16 matching lines @@
       CreateScrollableLayer(3, content_size, root.get());
 
   std::unique_ptr<LayerImpl> child =
       CreateScrollableLayer(2, content_size, root.get());
   LayerImpl* grand_child_layer = grand_child.get();
   child->test_properties()->AddChild(std::move(grand_child));
 
   LayerImpl* child_layer = child.get();
   root->test_properties()->AddChild(std::move(child));
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
   host_impl_->active_tree()->DidBecomeActive();
-  host_impl_->SetViewportSize(surface_size);
+
   grand_child_layer->layer_tree_impl()
       ->property_trees()
       ->scroll_tree.UpdateScrollOffsetBaseForTesting(grand_child_layer->id(),
                                                      gfx::ScrollOffset(0, 5));
   child_layer->layer_tree_impl()
       ->property_trees()
       ->scroll_tree.UpdateScrollOffsetBaseForTesting(child_layer->id(),
                                                      gfx::ScrollOffset(3, 0));
 
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->SetViewportSize(surface_size);
   DrawFrame();
   {
     gfx::Vector2d scroll_delta(-8, -7);
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
               host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
                                       InputHandler::WHEEL)
                   .thread);
     host_impl_->ScrollBy(UpdateState(gfx::Point(), scroll_delta).get());
     host_impl_->ScrollEnd(EndState().get());
 
@@ skipping 36 matching lines @@
       CreateScrollableLayer(4, surface_size, root_clip.get());
   LayerImpl* grand_child_layer = grand_child.get();
   child->test_properties()->AddChild(std::move(grand_child));
 
   LayerImpl* child_layer = child.get();
   root_scrolling->test_properties()->AddChild(std::move(child));
   root_clip->test_properties()->AddChild(std::move(root_scrolling));
   EXPECT_EQ(viewport_size, root_clip->bounds());
   root_ptr->test_properties()->AddChild(std::move(root_clip));
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root_ptr));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
   host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 1, 3,
                                                       Layer::INVALID_ID);
   host_impl_->active_tree()->DidBecomeActive();
   host_impl_->SetViewportSize(viewport_size);
 
   grand_child_layer->layer_tree_impl()
       ->property_trees()
       ->scroll_tree.UpdateScrollOffsetBaseForTesting(grand_child_layer->id(),
                                                      gfx::ScrollOffset(0, 2));
   child_layer->layer_tree_impl()
       ->property_trees()
       ->scroll_tree.UpdateScrollOffsetBaseForTesting(child_layer->id(),
                                                      gfx::ScrollOffset(0, 3));
 
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
   {
     gfx::Vector2d scroll_delta(0, -10);
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
               host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
                                       InputHandler::NON_BUBBLING_GESTURE)
                   .thread);
     host_impl_->ScrollBy(UpdateState(gfx::Point(), scroll_delta).get());
     host_impl_->ScrollEnd(EndState().get());
 
@@ skipping 96 matching lines @@
   std::unique_ptr<LayerImpl> child =
       CreateScrollableLayer(2, content_size, root_scroll.get());
   child->test_properties()->is_container_for_fixed_position_layers = true;
   root_scroll->SetBounds(content_size);
 
   int root_scroll_id = root_scroll->id();
   root_scroll->test_properties()->AddChild(std::move(child));
   root_clip->test_properties()->AddChild(std::move(root_scroll));
   root_ptr->test_properties()->AddChild(std::move(root_clip));
 
-  host_impl_->SetViewportSize(surface_size);
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root_ptr));
   host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 4, 2,
                                                       Layer::INVALID_ID);
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
   host_impl_->active_tree()->DidBecomeActive();
-  SetNeedsRebuildPropertyTrees();
+
+  host_impl_->SetViewportSize(surface_size);
   DrawFrame();
   {
     gfx::Vector2d scroll_delta(0, 4);
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
               host_impl_->ScrollBegin(BeginState(gfx::Point(5, 5)).get(),
                                       InputHandler::WHEEL)
                   .thread);
     host_impl_->ScrollBy(UpdateState(gfx::Point(), scroll_delta).get());
     host_impl_->ScrollEnd(EndState().get());
 
@@ skipping 15 matching lines @@
       LayerImpl::Create(host_impl_->active_tree(), 2);
   std::unique_ptr<LayerImpl> root_scroll =
       CreateScrollableLayer(3, surface_size, root_clip.get());
   root_clip->test_properties()->force_render_surface = true;
   root_scroll->test_properties()->is_container_for_fixed_position_layers = true;
   root_clip->test_properties()->AddChild(std::move(root_scroll));
   root_ptr->test_properties()->AddChild(std::move(root_clip));
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root_ptr));
   host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 1, 3,
                                                       Layer::INVALID_ID);
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
   host_impl_->active_tree()->DidBecomeActive();
+
   host_impl_->SetViewportSize(surface_size);
 
   // Draw one frame and then immediately rebuild the layer tree to mimic a tree
   // synchronization.
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
+
   host_impl_->active_tree()->DetachLayers();
   std::unique_ptr<LayerImpl> root_ptr2 =
       LayerImpl::Create(host_impl_->active_tree(), 4);
   std::unique_ptr<LayerImpl> root_clip2 =
       LayerImpl::Create(host_impl_->active_tree(), 5);
   std::unique_ptr<LayerImpl> root_scroll2 =
       CreateScrollableLayer(6, surface_size, root_clip2.get());
   root_scroll2->test_properties()->is_container_for_fixed_position_layers =
       true;
   root_clip2->test_properties()->AddChild(std::move(root_scroll2));
   root_clip2->test_properties()->force_render_surface = true;
   root_ptr2->test_properties()->AddChild(std::move(root_clip2));
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root_ptr2));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
   host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 4, 6,
                                                       Layer::INVALID_ID);
   host_impl_->active_tree()->DidBecomeActive();
 
   // Scrolling should still work even though we did not draw yet.
-  SetNeedsRebuildPropertyTrees();
-  RebuildPropertyTrees();
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_->ScrollBegin(BeginState(gfx::Point(5, 5)).get(),
                                     InputHandler::WHEEL)
                 .thread);
 }
 
 TEST_F(LayerTreeHostImplTest, ScrollAxisAlignedRotatedLayer) {
   LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 100));
   scroll_layer->SetDrawsContent(true);
 
   // Rotate the root layer 90 degrees counter-clockwise about its center.
   gfx::Transform rotate_transform;
   rotate_transform.Rotate(-90.0);
   host_impl_->active_tree()->root_layer_for_testing()->SetTransform(
       rotate_transform);
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   gfx::Size surface_size(50, 50);
   host_impl_->SetViewportSize(surface_size);
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   // Scroll to the right in screen coordinates with a gesture.
   gfx::Vector2d gesture_scroll_delta(10, 0);
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_
                 ->ScrollBegin(BeginState(gfx::Point()).get(),
                               InputHandler::TOUCHSCREEN)
                 .thread);
   host_impl_->ScrollBy(UpdateState(gfx::Point(), gesture_scroll_delta).get());
@@ skipping 42 matching lines @@
   clip_layer->SetBounds(
       gfx::Size(child->bounds().width(), child->bounds().height() / 2));
   // The rotation depends on the layer's transform origin, and the child layer
   // is a different size than the clip, so make sure the clip layer's origin
   // lines up over the child.
   clip_layer->test_properties()->transform_origin = gfx::Point3F(
       clip_layer->bounds().width() * 0.5f, clip_layer->bounds().height(), 0.f);
   LayerImpl* child_ptr = child.get();
   clip_layer->test_properties()->AddChild(std::move(child));
   scroll_layer->test_properties()->AddChild(std::move(clip_layer));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   gfx::Size surface_size(50, 50);
   host_impl_->SetViewportSize(surface_size);
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
   {
     // Scroll down in screen coordinates with a gesture.
     gfx::Vector2d gesture_scroll_delta(0, 10);
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
               host_impl_
                   ->ScrollBegin(BeginState(gfx::Point(1, 1)).get(),
                                 InputHandler::TOUCHSCREEN)
                   .thread);
     host_impl_->ScrollBy(UpdateState(gfx::Point(), gesture_scroll_delta).get());
@@ skipping 61 matching lines @@
 
   clip_layer->SetBounds(gfx::Size(child_ptr->bounds().width() / 2,
                                   child_ptr->bounds().height() / 2));
   // The transform depends on the layer's transform origin, and the child layer
   // is a different size than the clip, so make sure the clip layer's origin
   // lines up over the child.
   clip_layer->test_properties()->transform_origin = gfx::Point3F(
       clip_layer->bounds().width(), clip_layer->bounds().height(), 0.f);
   clip_layer->test_properties()->AddChild(std::move(child));
   scroll_layer->test_properties()->AddChild(std::move(clip_layer));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   gfx::Size surface_size(50, 50);
   host_impl_->SetViewportSize(surface_size);
 
   std::unique_ptr<ScrollAndScaleSet> scroll_info;
 
   gfx::Vector2d gesture_scroll_deltas[4];
   gesture_scroll_deltas[0] = gfx::Vector2d(4, 10);
   gesture_scroll_deltas[1] = gfx::Vector2d(4, 10);
   gesture_scroll_deltas[2] = gfx::Vector2d(10, 0);
   gesture_scroll_deltas[3] = gfx::Vector2d(10, 0);
 
   gfx::Vector2d expected_scroll_deltas[4];
   // Perspective affects the vertical delta by a different
   // amount depending on the vertical position of the |viewport_point|.
   expected_scroll_deltas[0] = gfx::Vector2d(2, 8);
   expected_scroll_deltas[1] = gfx::Vector2d(1, 4);
   // Deltas which start with the same vertical position of the
   // |viewport_point| are subject to identical perspective effects.
   expected_scroll_deltas[2] = gfx::Vector2d(4, 0);
   expected_scroll_deltas[3] = gfx::Vector2d(4, 0);
 
   gfx::Point viewport_point(1, 1);
 
-  SetNeedsRebuildPropertyTrees();
   // Scroll in screen coordinates with a gesture. Each scroll starts
   // where the previous scroll ended, but the scroll position is reset
   // for each scroll.
   for (int i = 0; i < 4; ++i) {
     SetScrollOffsetDelta(child_ptr, gfx::Vector2dF());
     DrawFrame();
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
               host_impl_
                   ->ScrollBegin(BeginState(viewport_point).get(),
                                 InputHandler::TOUCHSCREEN)
@@ skipping 15 matching lines @@
 
 TEST_F(LayerTreeHostImplTest, ScrollScaledLayer) {
   LayerImpl* scroll_layer =
       SetupScrollAndContentsLayers(gfx::Size(100, 100));
 
   // Scale the layer to twice its normal size.
   int scale = 2;
   gfx::Transform scale_transform;
   scale_transform.Scale(scale, scale);
   scroll_layer->test_properties()->parent->SetTransform(scale_transform);
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   gfx::Size surface_size(50, 50);
   host_impl_->SetViewportSize(surface_size);
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   // Scroll down in screen coordinates with a gesture.
   gfx::Vector2d scroll_delta(0, 10);
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_
                 ->ScrollBegin(BeginState(gfx::Point()).get(),
                               InputHandler::TOUCHSCREEN)
                 .thread);
   host_impl_->ScrollBy(UpdateState(gfx::Point(), scroll_delta).get());
@@ skipping 22 matching lines @@
                                  wheel_scroll_delta));
 }
 
 TEST_F(LayerTreeHostImplTest, ScrollViewportRounding) {
   int width = 332;
   int height = 20;
   int scale = 3;
   SetupScrollAndContentsLayers(gfx::Size(width, height));
   host_impl_->active_tree()->InnerViewportContainerLayer()->SetBounds(
       gfx::Size(width * scale - 1, height * scale));
-  SetNeedsRebuildPropertyTrees();
-  RebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+
   host_impl_->active_tree()->SetDeviceScaleFactor(scale);
   host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 0.5f, 4.f);
 
   LayerImpl* inner_viewport_scroll_layer =
       host_impl_->active_tree()->InnerViewportScrollLayer();
   EXPECT_EQ(gfx::ScrollOffset(0, 0),
             inner_viewport_scroll_layer->MaxScrollOffset());
 }
 
 class TestInputHandlerClient : public InputHandlerClient {
@@ skipping 58 matching lines @@
   float min_page_scale_factor_;
   float max_page_scale_factor_;
 };
 
 TEST_F(LayerTreeHostImplTest, RootLayerScrollOffsetDelegation) {
   TestInputHandlerClient scroll_watcher;
   host_impl_->SetViewportSize(gfx::Size(10, 20));
   LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 100));
   LayerImpl* clip_layer =
       scroll_layer->test_properties()->parent->test_properties()->parent;
-  SetNeedsRebuildPropertyTrees();
   clip_layer->SetBounds(gfx::Size(10, 20));
-  RebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   host_impl_->BindToClient(&scroll_watcher);
 
   gfx::Vector2dF initial_scroll_delta(10.f, 10.f);
   scroll_layer->layer_tree_impl()
       ->property_trees()
       ->scroll_tree.UpdateScrollOffsetBaseForTesting(scroll_layer->id(),
                                                      gfx::ScrollOffset());
   SetScrollOffsetDelta(scroll_layer, initial_scroll_delta);
 
@@ skipping 100 matching lines @@
   scroll_layer->SetDrawsContent(true);
 
   // Draw first frame to clear any pending draws and check scroll.
   DrawFrame();
   CheckLayerScrollDelta(scroll_layer, gfx::Vector2dF(0.f, 0.f));
   EXPECT_FALSE(host_impl_->active_tree()->needs_update_draw_properties());
 
   // Set external scroll delta on delegate and notify LayerTreeHost.
   gfx::ScrollOffset scroll_offset(10.f, 10.f);
   host_impl_->SetSynchronousInputHandlerRootScrollOffset(scroll_offset);
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   // Check scroll delta reflected in layer.
   LayerTreeHostImpl::FrameData frame;
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
   EXPECT_FALSE(frame.has_no_damage);
   CheckLayerScrollDelta(scroll_layer, ScrollOffsetToVector2dF(scroll_offset));
 }
 
 TEST_F(LayerTreeHostImplTest, OverscrollRoot) {
   InputHandlerScrollResult scroll_result;
   SetupScrollAndContentsLayers(gfx::Size(100, 100));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   host_impl_->SetViewportSize(gfx::Size(50, 50));
   host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 0.5f, 4.f);
   DrawFrame();
   EXPECT_EQ(gfx::Vector2dF(), host_impl_->accumulated_root_overscroll());
 
   // In-bounds scrolling does not affect overscroll.
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
                                     InputHandler::WHEEL)
                 .thread);
@@ skipping 128 matching lines @@
       CreateScrollableLayer(3, surface_size, root_clip.get());
 
   std::unique_ptr<LayerImpl> child =
       CreateScrollableLayer(2, surface_size, root_clip.get());
   LayerImpl* grand_child_layer = grand_child.get();
   child->test_properties()->AddChild(std::move(grand_child));
 
   LayerImpl* child_layer = child.get();
   root->test_properties()->AddChild(std::move(child));
   root_clip->test_properties()->AddChild(std::move(root));
+  host_impl_->active_tree()->SetRootLayerForTesting(std::move(root_clip));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+  host_impl_->active_tree()->DidBecomeActive();
+
   child_layer->layer_tree_impl()
       ->property_trees()
       ->scroll_tree.UpdateScrollOffsetBaseForTesting(child_layer->id(),
                                                      gfx::ScrollOffset(0, 3));
   grand_child_layer->layer_tree_impl()
       ->property_trees()
       ->scroll_tree.UpdateScrollOffsetBaseForTesting(grand_child_layer->id(),
                                                      gfx::ScrollOffset(0, 2));
-  host_impl_->active_tree()->SetRootLayerForTesting(std::move(root_clip));
-  host_impl_->active_tree()->DidBecomeActive();
+
   host_impl_->SetViewportSize(surface_size);
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
   {
     gfx::Vector2d scroll_delta(0, -10);
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
               host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
                                       InputHandler::NON_BUBBLING_GESTURE)
                   .thread);
     scroll_result =
         host_impl_->ScrollBy(UpdateState(gfx::Point(), scroll_delta).get());
     EXPECT_TRUE(scroll_result.did_scroll);
@@ skipping 35 matching lines @@
     host_impl_->ScrollEnd(EndState().get());
   }
 }
 
 TEST_F(LayerTreeHostImplTest, OverscrollChildEventBubbling) {
   // When we try to scroll a non-scrollable child layer, the scroll delta
   // should be applied to one of its ancestors if possible. Overscroll should
   // be reflected only when it has bubbled up to the root scrolling layer.
   InputHandlerScrollResult scroll_result;
   SetupScrollAndContentsLayers(gfx::Size(20, 20));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   DrawFrame();
   {
     gfx::Vector2d scroll_delta(0, 8);
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
               host_impl_->ScrollBegin(BeginState(gfx::Point(5, 5)).get(),
                                       InputHandler::WHEEL)
                   .thread);
     scroll_result =
         host_impl_->ScrollBy(UpdateState(gfx::Point(), scroll_delta).get());
     EXPECT_TRUE(scroll_result.did_scroll);
@@ skipping 14 matching lines @@
 }
 
 TEST_F(LayerTreeHostImplTest, OverscrollAlways) {
   InputHandlerScrollResult scroll_result;
   LayerTreeSettings settings = DefaultSettings();
   CreateHostImpl(settings, CreateOutputSurface());
 
   LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(50, 50));
   LayerImpl* clip_layer =
       scroll_layer->test_properties()->parent->test_properties()->parent;
+
   clip_layer->SetBounds(gfx::Size(50, 50));
-  SetNeedsRebuildPropertyTrees();
-  RebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+
   host_impl_->SetViewportSize(gfx::Size(50, 50));
   host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 0.5f, 4.f);
   DrawFrame();
   EXPECT_EQ(gfx::Vector2dF(), host_impl_->accumulated_root_overscroll());
 
   // Even though the layer can't scroll the overscroll still happens.
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
                                     InputHandler::WHEEL)
                 .thread);
   scroll_result = host_impl_->ScrollBy(
       UpdateState(gfx::Point(), gfx::Vector2d(0, 10)).get());
   EXPECT_FALSE(scroll_result.did_scroll);
   EXPECT_TRUE(scroll_result.did_overscroll_root);
   EXPECT_EQ(gfx::Vector2dF(0, 10), host_impl_->accumulated_root_overscroll());
 }
 
 TEST_F(LayerTreeHostImplTest, NoOverscrollWhenNotAtEdge) {
   InputHandlerScrollResult scroll_result;
   SetupScrollAndContentsLayers(gfx::Size(200, 200));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
   DrawFrame();
   {
     // Edge glow effect should be applicable only upon reaching Edges
     // of the content. unnecessary glow effect calls shouldn't be
     // called while scrolling up without reaching the edge of the content.
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
               host_impl_->ScrollBegin(BeginState(gfx::Point(0, 0)).get(),
                                       InputHandler::WHEEL)
                   .thread);
@@ skipping 147 matching lines @@
   BlendStateCheckLayer* layer1 =
       static_cast<BlendStateCheckLayer*>(root->test_properties()->children[0]);
   layer1->SetPosition(gfx::PointF(2.f, 2.f));
 
   LayerTreeHostImpl::FrameData frame;
 
   // Opaque layer, drawn without blending.
   layer1->SetContentsOpaque(true);
   layer1->SetExpectation(false, false);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
 
   // Layer with translucent content and painting, so drawn with blending.
   layer1->SetContentsOpaque(false);
   layer1->SetExpectation(true, false);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
 
   // Layer with translucent opacity, drawn with blending.
   layer1->SetContentsOpaque(true);
   layer1->test_properties()->opacity = 0.5f;
   layer1->NoteLayerPropertyChanged();
   layer1->SetExpectation(true, false);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
 
   // Layer with translucent opacity and painting, drawn with blending.
   layer1->SetContentsOpaque(true);
   layer1->test_properties()->opacity = 0.5f;
   layer1->NoteLayerPropertyChanged();
   layer1->SetExpectation(true, false);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
 
   layer1->test_properties()->AddChild(BlendStateCheckLayer::Create(
       host_impl_->active_tree(), 3, host_impl_->resource_provider()));
   BlendStateCheckLayer* layer2 = static_cast<BlendStateCheckLayer*>(
       layer1->test_properties()->children[0]);
   layer2->SetPosition(gfx::PointF(4.f, 4.f));
 
   // 2 opaque layers, drawn without blending.
   layer1->SetContentsOpaque(true);
   layer1->test_properties()->opacity = 1.f;
   layer1->NoteLayerPropertyChanged();
   layer1->SetExpectation(false, false);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
   layer2->SetContentsOpaque(true);
   layer2->test_properties()->opacity = 1.f;
   layer2->NoteLayerPropertyChanged();
   layer2->SetExpectation(false, false);
   layer2->SetUpdateRect(gfx::Rect(layer1->bounds()));
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   EXPECT_TRUE(layer2->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
 
   // Parent layer with translucent content, drawn with blending.
   // Child layer with opaque content, drawn without blending.
   layer1->SetContentsOpaque(false);
   layer1->SetExpectation(true, false);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
   layer2->SetExpectation(false, false);
   layer2->SetUpdateRect(gfx::Rect(layer1->bounds()));
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   EXPECT_TRUE(layer2->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
 
   // Parent layer with translucent content but opaque painting, drawn without
   // blending.
   // Child layer with opaque content, drawn without blending.
   layer1->SetContentsOpaque(true);
   layer1->SetExpectation(false, false);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
   layer2->SetExpectation(false, false);
   layer2->SetUpdateRect(gfx::Rect(layer1->bounds()));
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   EXPECT_TRUE(layer2->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
 
   // Parent layer with translucent opacity and opaque content. Since it has a
   // drawing child, it's drawn to a render surface which carries the opacity,
   // so it's itself drawn without blending.
   // Child layer with opaque content, drawn without blending (parent surface
   // carries the inherited opacity).
   layer1->SetContentsOpaque(true);
   layer1->test_properties()->opacity = 0.5f;
   layer1->NoteLayerPropertyChanged();
   layer1->test_properties()->force_render_surface = true;
   layer1->SetExpectation(false, true);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
   layer2->SetExpectation(false, false);
   layer2->SetUpdateRect(gfx::Rect(layer1->bounds()));
   FakeLayerTreeHostImpl::RecursiveUpdateNumChildren(
       host_impl_->active_tree()->root_layer_for_testing());
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   EXPECT_TRUE(layer2->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
   layer1->test_properties()->force_render_surface = false;
 
   // Draw again, but with child non-opaque, to make sure
   // layer1 not culled.
   layer1->SetContentsOpaque(true);
   layer1->test_properties()->opacity = 1.f;
   layer1->NoteLayerPropertyChanged();
   layer1->SetExpectation(false, false);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
   layer2->SetContentsOpaque(true);
   layer2->test_properties()->opacity = 0.5f;
   layer2->NoteLayerPropertyChanged();
   layer2->SetExpectation(true, false);
   layer2->SetUpdateRect(gfx::Rect(layer1->bounds()));
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   EXPECT_TRUE(layer2->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
 
   // A second way of making the child non-opaque.
   layer1->SetContentsOpaque(true);
   layer1->test_properties()->opacity = 1.f;
   layer1->NoteLayerPropertyChanged();
   layer1->SetExpectation(false, false);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
   layer2->SetContentsOpaque(false);
   layer2->test_properties()->opacity = 1.f;
   layer2->NoteLayerPropertyChanged();
   layer2->SetExpectation(true, false);
   layer2->SetUpdateRect(gfx::Rect(layer1->bounds()));
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   EXPECT_TRUE(layer2->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
 
   // And when the layer says its not opaque but is painted opaque, it is not
   // blended.
   layer1->SetContentsOpaque(true);
   layer1->test_properties()->opacity = 1.f;
   layer1->NoteLayerPropertyChanged();
   layer1->SetExpectation(false, false);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
   layer2->SetContentsOpaque(true);
   layer2->test_properties()->opacity = 1.f;
   layer2->NoteLayerPropertyChanged();
   layer2->SetExpectation(false, false);
   layer2->SetUpdateRect(gfx::Rect(layer1->bounds()));
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   EXPECT_TRUE(layer2->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
 
   // Layer with partially opaque contents, drawn with blending.
   layer1->SetContentsOpaque(false);
   layer1->SetQuadRect(gfx::Rect(5, 5, 5, 5));
   layer1->SetQuadVisibleRect(gfx::Rect(5, 5, 5, 5));
   layer1->SetOpaqueContentRect(gfx::Rect(5, 5, 2, 5));
   layer1->SetExpectation(true, false);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
 
   // Layer with partially opaque contents partially culled, drawn with blending.
   layer1->SetContentsOpaque(false);
   layer1->SetQuadRect(gfx::Rect(5, 5, 5, 5));
   layer1->SetQuadVisibleRect(gfx::Rect(5, 5, 5, 2));
   layer1->SetOpaqueContentRect(gfx::Rect(5, 5, 2, 5));
   layer1->SetExpectation(true, false);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
 
   // Layer with partially opaque contents culled, drawn with blending.
   layer1->SetContentsOpaque(false);
   layer1->SetQuadRect(gfx::Rect(5, 5, 5, 5));
   layer1->SetQuadVisibleRect(gfx::Rect(7, 5, 3, 5));
   layer1->SetOpaqueContentRect(gfx::Rect(5, 5, 2, 5));
   layer1->SetExpectation(true, false);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
 
   // Layer with partially opaque contents and translucent contents culled, drawn
   // without blending.
   layer1->SetContentsOpaque(false);
   layer1->SetQuadRect(gfx::Rect(5, 5, 5, 5));
   layer1->SetQuadVisibleRect(gfx::Rect(5, 5, 2, 5));
   layer1->SetOpaqueContentRect(gfx::Rect(5, 5, 2, 5));
   layer1->SetExpectation(false, false);
   layer1->SetUpdateRect(gfx::Rect(layer1->bounds()));
-  SetNeedsRebuildPropertyTrees();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(layer1->quads_appended());
   host_impl_->DidDrawAllLayers(frame);
 }
 
 class LayerTreeHostImplViewportCoveredTest : public LayerTreeHostImplTest {
  protected:
   LayerTreeHostImplViewportCoveredTest() :
       gutter_quad_material_(DrawQuad::SOLID_COLOR),
       child_(NULL),
@@ skipping 28 matching lines @@
     child_->SetContentsOpaque(true);
   }
 
   // Expect no gutter rects.
   void TestLayerCoversFullViewport() {
     gfx::Rect layer_rect(viewport_size_);
     child_->SetPosition(gfx::PointF(layer_rect.origin()));
     child_->SetBounds(layer_rect.size());
     child_->SetQuadRect(gfx::Rect(layer_rect.size()));
     child_->SetQuadVisibleRect(gfx::Rect(layer_rect.size()));
+    host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
     LayerTreeHostImpl::FrameData frame;
-    SetNeedsRebuildPropertyTrees();
-    EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
     ASSERT_EQ(1u, frame.render_passes.size());
 
     EXPECT_EQ(0u, CountGutterQuads(frame.render_passes[0]->quad_list));
     EXPECT_EQ(1u, frame.render_passes[0]->quad_list.size());
     ValidateTextureDrawQuads(frame.render_passes[0]->quad_list);
 
     VerifyQuadsExactlyCoverViewport(frame.render_passes[0]->quad_list);
     host_impl_->DidDrawAllLayers(frame);
   }
 
   // Expect fullscreen gutter rect.
   void SetUpEmptylayer() {
     gfx::Rect layer_rect(0, 0, 0, 0);
     child_->SetPosition(gfx::PointF(layer_rect.origin()));
     child_->SetBounds(layer_rect.size());
     child_->SetQuadRect(gfx::Rect(layer_rect.size()));
     child_->SetQuadVisibleRect(gfx::Rect(layer_rect.size()));
+    host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   }
 
   void VerifyEmptyLayerRenderPasses(const RenderPassList& render_passes) {
     ASSERT_EQ(1u, render_passes.size());
 
     EXPECT_EQ(1u, CountGutterQuads(render_passes[0]->quad_list));
     EXPECT_EQ(1u, render_passes[0]->quad_list.size());
     ValidateTextureDrawQuads(render_passes[0]->quad_list);
 
     VerifyQuadsExactlyCoverViewport(render_passes[0]->quad_list);
   }
 
   void TestEmptyLayer() {
     SetUpEmptylayer();
     LayerTreeHostImpl::FrameData frame;
-    SetNeedsRebuildPropertyTrees();
-    EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
     VerifyEmptyLayerRenderPasses(frame.render_passes);
     host_impl_->DidDrawAllLayers(frame);
   }
 
   void TestEmptyLayerWithOnDraw() {
     SetUpEmptylayer();
     gfx::Transform identity;
     gfx::Rect viewport(viewport_size_);
     bool resourceless_software_draw = true;
-    SetNeedsRebuildPropertyTrees();
     host_impl_->OnDraw(identity, viewport, viewport,
                        resourceless_software_draw);
     VerifyEmptyLayerRenderPasses(last_on_draw_render_passes_);
   }
 
   // Expect four surrounding gutter rects.
   void SetUpLayerInMiddleOfViewport() {
     gfx::Rect layer_rect(500, 500, 200, 200);
     child_->SetPosition(gfx::PointF(layer_rect.origin()));
     child_->SetBounds(layer_rect.size());
     child_->SetQuadRect(gfx::Rect(layer_rect.size()));
     child_->SetQuadVisibleRect(gfx::Rect(layer_rect.size()));
+    host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   }
 
   void VerifyLayerInMiddleOfViewport(const RenderPassList& render_passes) {
     ASSERT_EQ(1u, render_passes.size());
 
     EXPECT_EQ(4u, CountGutterQuads(render_passes[0]->quad_list));
     EXPECT_EQ(5u, render_passes[0]->quad_list.size());
     ValidateTextureDrawQuads(render_passes[0]->quad_list);
 
     VerifyQuadsExactlyCoverViewport(render_passes[0]->quad_list);
   }
 
   void TestLayerInMiddleOfViewport() {
     SetUpLayerInMiddleOfViewport();
     LayerTreeHostImpl::FrameData frame;
-    SetNeedsRebuildPropertyTrees();
-    EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
     VerifyLayerInMiddleOfViewport(frame.render_passes);
     host_impl_->DidDrawAllLayers(frame);
   }
 
   void TestLayerInMiddleOfViewportWithOnDraw() {
     SetUpLayerInMiddleOfViewport();
     gfx::Transform identity;
     gfx::Rect viewport(viewport_size_);
     bool resourceless_software_draw = true;
-    SetNeedsRebuildPropertyTrees();
     host_impl_->OnDraw(identity, viewport, viewport,
                        resourceless_software_draw);
     VerifyLayerInMiddleOfViewport(last_on_draw_render_passes_);
   }
 
   // Expect no gutter rects.
   void SetUpLayerIsLargerThanViewport() {
     gfx::Rect layer_rect(viewport_size_.width() + 10,
                          viewport_size_.height() + 10);
     child_->SetPosition(gfx::PointF(layer_rect.origin()));
     child_->SetBounds(layer_rect.size());
     child_->SetQuadRect(gfx::Rect(layer_rect.size()));
     child_->SetQuadVisibleRect(gfx::Rect(layer_rect.size()));
+    host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   }
 
   void VerifyLayerIsLargerThanViewport(const RenderPassList& render_passes) {
     ASSERT_EQ(1u, render_passes.size());
 
     EXPECT_EQ(0u, CountGutterQuads(render_passes[0]->quad_list));
     EXPECT_EQ(1u, render_passes[0]->quad_list.size());
     ValidateTextureDrawQuads(render_passes[0]->quad_list);
   }
 
   void TestLayerIsLargerThanViewport() {
     SetUpLayerIsLargerThanViewport();
     LayerTreeHostImpl::FrameData frame;
-    SetNeedsRebuildPropertyTrees();
-    EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
     VerifyLayerIsLargerThanViewport(frame.render_passes);
     host_impl_->DidDrawAllLayers(frame);
   }
 
   void TestLayerIsLargerThanViewportWithOnDraw() {
     SetUpLayerIsLargerThanViewport();
     gfx::Transform identity;
     gfx::Rect viewport(viewport_size_);
     bool resourceless_software_draw = true;
-    SetNeedsRebuildPropertyTrees();
     host_impl_->OnDraw(identity, viewport, viewport,
                        resourceless_software_draw);
     VerifyLayerIsLargerThanViewport(last_on_draw_render_passes_);
   }
 
   void DidActivateSyncTree() override { did_activate_pending_tree_ = true; }
 
   void set_gutter_quad_material(DrawQuad::Material material) {
     gutter_quad_material_ = material;
   }
@@ skipping 142 matching lines @@
   std::unique_ptr<OutputSurface> output_surface(
       FakeOutputSurface::Create3d(provider));
   CreateHostImpl(DefaultSettings(), std::move(output_surface));
 
   std::unique_ptr<LayerImpl> root =
       FakeDrawableLayerImpl::Create(host_impl_->active_tree(), 1);
   root->SetBounds(gfx::Size(10, 10));
   root->SetDrawsContent(true);
   root->test_properties()->force_render_surface = true;
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   EXPECT_FALSE(provider->TestContext3d()->reshape_called());
   provider->TestContext3d()->clear_reshape_called();
 
   LayerTreeHostImpl::FrameData frame;
   host_impl_->SetViewportSize(gfx::Size(10, 10));
   host_impl_->active_tree()->SetDeviceScaleFactor(1.f);
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(provider->TestContext3d()->reshape_called());
   EXPECT_EQ(provider->TestContext3d()->width(), 10);
   EXPECT_EQ(provider->TestContext3d()->height(), 10);
   EXPECT_EQ(provider->TestContext3d()->scale_factor(), 1.f);
   host_impl_->DidDrawAllLayers(frame);
   provider->TestContext3d()->clear_reshape_called();
 
   host_impl_->SetViewportSize(gfx::Size(20, 30));
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(provider->TestContext3d()->reshape_called());
   EXPECT_EQ(provider->TestContext3d()->width(), 20);
   EXPECT_EQ(provider->TestContext3d()->height(), 30);
   EXPECT_EQ(provider->TestContext3d()->scale_factor(), 1.f);
   host_impl_->DidDrawAllLayers(frame);
   provider->TestContext3d()->clear_reshape_called();
 
   host_impl_->active_tree()->SetDeviceScaleFactor(2.f);
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   EXPECT_TRUE(provider->TestContext3d()->reshape_called());
   EXPECT_EQ(provider->TestContext3d()->width(), 20);
   EXPECT_EQ(provider->TestContext3d()->height(), 30);
   EXPECT_EQ(provider->TestContext3d()->scale_factor(), 2.f);
   host_impl_->DidDrawAllLayers(frame);
   provider->TestContext3d()->clear_reshape_called();
 }
 
 // Make sure damage tracking propagates all the way to the graphics context,
@@ skipping 56 matching lines @@
   layer_tree_host_impl->active_tree()
       ->root_layer_for_testing()
       ->test_properties()
       ->children[0]
       ->SetPosition(gfx::PointF());
   layer_tree_host_impl->active_tree()
       ->root_layer_for_testing()
       ->test_properties()
       ->children[0]
       ->NoteLayerPropertyChanged();
-  layer_tree_host_impl->active_tree()->property_trees()->needs_rebuild = true;
   layer_tree_host_impl->active_tree()
       ->BuildLayerListAndPropertyTreesForTesting();
   EXPECT_EQ(DRAW_SUCCESS, layer_tree_host_impl->PrepareToDraw(&frame));
   layer_tree_host_impl->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
   layer_tree_host_impl->SwapBuffers(frame);
 
   // Make sure that partial swap is constrained to the viewport dimensions
   // expected damage rect: gfx::Rect(500, 500);
   // expected swap rect: flipped damage rect, but also clamped to viewport
@@ skipping 22 matching lines @@
   std::unique_ptr<LayerImpl> child =
       FakeDrawableLayerImpl::Create(host_impl_->active_tree(), 2);
   child->SetBounds(gfx::Size(10, 10));
   child->SetDrawsContent(true);
   root->SetBounds(gfx::Size(10, 10));
   root->SetDrawsContent(true);
   root->test_properties()->force_render_surface = true;
   root->test_properties()->AddChild(std::move(child));
 
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
   LayerTreeHostImpl::FrameData frame;
 
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   EXPECT_EQ(1u, frame.render_surface_layer_list->size());
   EXPECT_EQ(1u, frame.render_passes.size());
   host_impl_->DidDrawAllLayers(frame);
 }
 
 class FakeLayerWithQuads : public LayerImpl {
  public:
   static std::unique_ptr<LayerImpl> Create(LayerTreeImpl* tree_impl, int id) {
     return base::WrapUnique(new FakeLayerWithQuads(tree_impl, id));
   }
@@ skipping 109 matching lines @@
   std::unique_ptr<MockContext> mock_context_owned(new MockContext);
   MockContext* mock_context = mock_context_owned.get();
   MockContextHarness harness(mock_context);
 
   // Run test case
   LayerTreeSettings settings = DefaultSettings();
   settings.renderer_settings.partial_swap_enabled = false;
   CreateHostImpl(settings,
                  FakeOutputSurface::Create3d(std::move(mock_context_owned)));
   SetupRootLayerImpl(FakeLayerWithQuads::Create(host_impl_->active_tree(), 1));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
   // Without partial swap, and no clipping, no scissor is set.
   harness.MustDrawSolidQuad();
   harness.MustSetNoScissor();
   {
     LayerTreeHostImpl::FrameData frame;
-    SetNeedsRebuildPropertyTrees();
-    EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
     host_impl_->DrawLayers(&frame);
     host_impl_->DidDrawAllLayers(frame);
   }
   Mock::VerifyAndClearExpectations(&mock_context);
 
   // Without partial swap, but a layer does clip its subtree, one scissor is
   // set.
-  host_impl_->active_tree()->root_layer_for_testing()->SetMasksToBounds(true);
-  host_impl_->active_tree()
-      ->root_layer_for_testing()
-      ->NoteLayerPropertyChanged();
+  auto* root = host_impl_->active_tree()->root_layer_for_testing();
+  root->SetMasksToBounds(true);
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+  root->NoteLayerPropertyChanged();
   harness.MustDrawSolidQuad();
   harness.MustSetScissor(0, 0, 10, 10);
   {
     LayerTreeHostImpl::FrameData frame;
-    SetNeedsRebuildPropertyTrees();
-    EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
     host_impl_->DrawLayers(&frame);
     host_impl_->DidDrawAllLayers(frame);
   }
   Mock::VerifyAndClearExpectations(&mock_context);
 }
 
 TEST_F(LayerTreeHostImplTest, PartialSwap) {
   std::unique_ptr<MockContext> context_owned(new MockContext);
   MockContext* mock_context = context_owned.get();
   MockContextHarness harness(mock_context);
 
   LayerTreeSettings settings = DefaultSettings();
   settings.renderer_settings.partial_swap_enabled = true;
   CreateHostImpl(settings,
                  FakeOutputSurface::Create3d(std::move(context_owned)));
   SetupRootLayerImpl(FakeLayerWithQuads::Create(host_impl_->active_tree(), 1));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
   // The first frame is not a partially-swapped one. No scissor should be set.
   harness.MustSetNoScissor();
   harness.MustDrawSolidQuad();
   {
     LayerTreeHostImpl::FrameData frame;
-    EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
     host_impl_->DrawLayers(&frame);
     host_impl_->DidDrawAllLayers(frame);
   }
   Mock::VerifyAndClearExpectations(&mock_context);
 
   // Damage a portion of the frame.
-  host_impl_->active_tree()->root_layer_for_testing()->SetUpdateRect(
-      gfx::Rect(0, 0, 2, 3));
+  auto* root = host_impl_->active_tree()->root_layer_for_testing();
+  root->SetUpdateRect(gfx::Rect(0, 0, 2, 3));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   // The second frame will be partially-swapped (the y coordinates are flipped).
   harness.MustSetScissor(0, 7, 2, 3);
   harness.MustDrawSolidQuad();
   {
     LayerTreeHostImpl::FrameData frame;
-    EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
     host_impl_->DrawLayers(&frame);
     host_impl_->DidDrawAllLayers(frame);
   }
   Mock::VerifyAndClearExpectations(&mock_context);
 }
 
 static std::unique_ptr<LayerTreeHostImpl> SetupLayersForOpacity(
     LayerTreeSettings settings,
     bool partial_swap,
     LayerTreeHostImplClient* client,
@@ skipping 146 matching lines @@
           gfx::Size(4, 4), 0x80, 0x80, 0x80, base::TimeDelta());
   FakeVideoFrameProvider provider;
   provider.set_frame(softwareFrame);
   std::unique_ptr<VideoLayerImpl> video_layer = VideoLayerImpl::Create(
       host_impl_->active_tree(), 4, &provider, media::VIDEO_ROTATION_0);
   video_layer->SetBounds(gfx::Size(10, 10));
   video_layer->SetDrawsContent(true);
   root_layer->test_properties()->AddChild(std::move(video_layer));
 
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root_layer));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
   EXPECT_EQ(0u, context3d->NumTextures());
 
   LayerTreeHostImpl::FrameData frame;
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
   host_impl_->SwapBuffers(frame);
 
   EXPECT_GT(context3d->NumTextures(), 0u);
 
   // Kill the layer tree.
   host_impl_->active_tree()->DetachLayers();
   // There should be no textures left in use after.
   EXPECT_EQ(0u, context3d->NumTextures());
@@ skipping 12 matching lines @@
   std::unique_ptr<MockDrawQuadsToFillScreenContext> mock_context_owned(
       new MockDrawQuadsToFillScreenContext);
   MockDrawQuadsToFillScreenContext* mock_context = mock_context_owned.get();
 
   // Run test case
   LayerTreeSettings settings = DefaultSettings();
   settings.renderer_settings.partial_swap_enabled = false;
   CreateHostImpl(settings,
                  FakeOutputSurface::Create3d(std::move(mock_context_owned)));
   SetupRootLayerImpl(LayerImpl::Create(host_impl_->active_tree(), 1));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   host_impl_->active_tree()->set_background_color(SK_ColorWHITE);
 
   // Verify one quad is drawn when transparent background set is not set.
   host_impl_->active_tree()->set_has_transparent_background(false);
   EXPECT_CALL(*mock_context, useProgram(_))
       .Times(1);
   EXPECT_CALL(*mock_context, drawElements(_, _, _, _))
       .Times(1);
   LayerTreeHostImpl::FrameData frame;
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
   Mock::VerifyAndClearExpectations(&mock_context);
 
   // Verify no quads are drawn when transparent background is set.
   host_impl_->active_tree()->set_has_transparent_background(true);
   host_impl_->SetFullRootLayerDamage();
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
   Mock::VerifyAndClearExpectations(&mock_context);
 }
 
 class LayerTreeHostImplTestWithDelegatingRenderer
     : public LayerTreeHostImplTest {
  protected:
   std::unique_ptr<OutputSurface> CreateOutputSurface() override {
     return FakeOutputSurface::CreateDelegating3d();
   }
 
   void DrawFrameAndTestDamage(const gfx::Rect& expected_damage) {
     bool expect_to_draw = !expected_damage.IsEmpty();
 
     LayerTreeHostImpl::FrameData frame;
-    EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
 
     if (!expect_to_draw) {
       // With no damage, we don't draw, and no quads are created.
       ASSERT_EQ(0u, frame.render_passes.size());
     } else {
       ASSERT_EQ(1u, frame.render_passes.size());
 
       // Verify the damage rect for the root render pass.
       const RenderPass* root_render_pass = frame.render_passes.back().get();
       EXPECT_EQ(expected_damage, root_render_pass->damage_rect);
@@ skipping 32 matching lines @@
 
   // Child layer is in the bottom right corner.
   std::unique_ptr<SolidColorLayerImpl> child =
       SolidColorLayerImpl::Create(host_impl_->active_tree(), 2);
   child->SetPosition(gfx::PointF(9.f, 9.f));
   child->SetBounds(gfx::Size(1, 1));
   child->SetDrawsContent(true);
   root->test_properties()->AddChild(std::move(child));
 
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
   // Draw a frame. In the first frame, the entire viewport should be damaged.
   gfx::Rect full_frame_damage(host_impl_->DrawViewportSize());
   DrawFrameAndTestDamage(full_frame_damage);
 
   // The second frame has damage that doesn't touch the child layer. Its quads
   // should still be generated.
   gfx::Rect small_damage = gfx::Rect(0, 0, 1, 1);
   host_impl_->active_tree()->root_layer_for_testing()->SetUpdateRect(
       small_damage);
@@ skipping 59 matching lines @@
 
   gfx::ScrollOffset scroll_offset(100000, 0);
   scrolling_layer->SetScrollClipLayer(root->id());
   scrolling_layer->layer_tree_impl()
       ->property_trees()
       ->scroll_tree.UpdateScrollOffsetBaseForTesting(scrolling_layer->id(),
                                                      scroll_offset);
 
   host_impl_->pending_tree()->BuildLayerListAndPropertyTreesForTesting();
   host_impl_->ActivateSyncTree();
-  host_impl_->active_tree()->SetRootLayerFromLayerListForTesting();
 
   bool update_lcd_text = false;
   host_impl_->active_tree()->UpdateDrawProperties(update_lcd_text);
   ASSERT_EQ(1u, host_impl_->active_tree()->RenderSurfaceLayerList().size());
 
   LayerTreeHostImpl::FrameData frame;
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
 
   ASSERT_EQ(1u, frame.render_passes.size());
   ASSERT_LE(1u, frame.render_passes[0]->quad_list.size());
   const DrawQuad* quad = frame.render_passes[0]->quad_list.front();
 
   bool clipped = false, force_aa = false;
   gfx::QuadF device_layer_quad = MathUtil::MapQuad(
       quad->shared_quad_state->quad_to_target_transform,
       gfx::QuadF(gfx::RectF(quad->shared_quad_state->visible_quad_layer_rect)),
       &clipped);
   EXPECT_FALSE(clipped);
   bool antialiased =
       GLRendererWithSetupQuadForAntialiasing::ShouldAntialiasQuad(
           device_layer_quad, clipped, force_aa);
   EXPECT_FALSE(antialiased);
 
   host_impl_->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
 }
 
-
 class CompositorFrameMetadataTest : public LayerTreeHostImplTest {
  public:
   CompositorFrameMetadataTest()
       : swap_buffers_complete_(0) {}
 
   void DidSwapBuffersCompleteOnImplThread() override {
     swap_buffers_complete_++;
   }
 
   int swap_buffers_complete_;
 };
 
 TEST_F(CompositorFrameMetadataTest, CompositorFrameAckCountsAsSwapComplete) {
   SetupRootLayerImpl(FakeLayerWithQuads::Create(host_impl_->active_tree(), 1));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
   {
     LayerTreeHostImpl::FrameData frame;
-    EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+    EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
     host_impl_->DrawLayers(&frame);
     host_impl_->DidDrawAllLayers(frame);
   }
   CompositorFrameAck ack;
   host_impl_->ReclaimResources(&ack);
   host_impl_->DidSwapBuffersComplete();
   EXPECT_EQ(swap_buffers_complete_, 1);
 }
 
 class CountingSoftwareDevice : public SoftwareOutputDevice {
@@ skipping 64 matching lines @@
       SolidColorLayerImpl::Create(host_impl_->active_tree(), 1);
 
   // VideoLayerImpl will not be drawn.
   FakeVideoFrameProvider provider;
   std::unique_ptr<VideoLayerImpl> video_layer = VideoLayerImpl::Create(
       host_impl_->active_tree(), 2, &provider, media::VIDEO_ROTATION_0);
   video_layer->SetBounds(gfx::Size(10, 10));
   video_layer->SetDrawsContent(true);
   root_layer->test_properties()->AddChild(std::move(video_layer));
   SetupRootLayerImpl(std::move(root_layer));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
   host_impl_->OnDraw(external_transform, external_viewport, external_clip,
                      resourceless_software_draw);
 
   EXPECT_EQ(1u, last_on_draw_frame_->will_draw_layers.size());
   EXPECT_EQ(host_impl_->active_tree()->root_layer_for_testing(),
             last_on_draw_frame_->will_draw_layers[0]);
 }
 
 // Checks that we have a non-0 default allocation if we pass a context that
@@ skipping 163 matching lines @@
 
   CreateHostImpl(DefaultSettings(),
                  FakeOutputSurface::Create3d(context_provider));
 
   SetupRootLayerImpl(LayerImpl::Create(host_impl_->active_tree(), 1));
 
   LayerImpl* root = host_impl_->active_tree()->root_layer_for_testing();
   root->test_properties()->copy_requests.push_back(
       CopyOutputRequest::CreateRequest(
           base::Bind(&ShutdownReleasesContext_Callback)));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   LayerTreeHostImpl::FrameData frame;
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
 
   // The CopyOutputResult's callback has a ref on the ContextProvider and a
   // texture in a texture mailbox.
   EXPECT_FALSE(context_provider->HasOneRef());
   EXPECT_EQ(1u, context_provider->TestContext3d()->NumTextures());
 
   host_impl_ = nullptr;
 
@@ skipping 22 matching lines @@
 
   root_scroll->test_properties()->AddChild(std::move(child));
   int root_id = root_scroll->id();
   root_clip->test_properties()->AddChild(std::move(root_scroll));
   root_ptr->test_properties()->AddChild(std::move(root_clip));
 
   host_impl_->SetViewportSize(surface_size);
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root_ptr));
   host_impl_->active_tree()->SetViewportLayersFromIds(Layer::INVALID_ID, 4, 1,
                                                       Layer::INVALID_ID);
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
   host_impl_->active_tree()->DidBecomeActive();
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
   {
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
               host_impl_
                   ->ScrollBegin(BeginState(gfx::Point()).get(),
                                 InputHandler::TOUCHSCREEN)
                   .thread);
 
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
               host_impl_->FlingScrollBegin().thread);
@@ skipping 13 matching lines @@
   }
 }
 
 TEST_F(LayerTreeHostImplTest, TouchFlingShouldContinueScrollingCurrentLayer) {
   // Scroll a child layer beyond its maximum scroll range and make sure the
   // the scroll doesn't bubble up to the parent layer.
   gfx::Size surface_size(10, 10);
   std::unique_ptr<LayerImpl> root =
       LayerImpl::Create(host_impl_->active_tree(), 1);
   root->test_properties()->force_render_surface = true;
-  std::unique_ptr<LayerImpl> root_scrolling =
+
+  std::unique_ptr<LayerImpl> root_scrolling_owned =
       CreateScrollableLayer(2, surface_size, root.get());
+  auto* root_scrolling = root_scrolling_owned.get();
+  root->test_properties()->AddChild(std::move(root_scrolling_owned));
 
-  std::unique_ptr<LayerImpl> grand_child =
+  std::unique_ptr<LayerImpl> child_owned =
+      CreateScrollableLayer(3, surface_size, root.get());
+  auto* child = child_owned.get();
+  root_scrolling->test_properties()->AddChild(std::move(child_owned));
+
+  std::unique_ptr<LayerImpl> grand_child_owned =
       CreateScrollableLayer(4, surface_size, root.get());
+  auto* grand_child = grand_child_owned.get();
+  child->test_properties()->AddChild(std::move(grand_child_owned));
+
+  host_impl_->active_tree()->SetRootLayerForTesting(std::move(root));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+  host_impl_->active_tree()->DidBecomeActive();
+
+  child->layer_tree_impl()
+      ->property_trees()
+      ->scroll_tree.UpdateScrollOffsetBaseForTesting(child->id(),
+                                                     gfx::ScrollOffset(0, 4));
   grand_child->layer_tree_impl()
       ->property_trees()
       ->scroll_tree.UpdateScrollOffsetBaseForTesting(grand_child->id(),
                                                      gfx::ScrollOffset(0, 2));
 
-  std::unique_ptr<LayerImpl> child =
-      CreateScrollableLayer(3, surface_size, root.get());
-  child->layer_tree_impl()
-      ->property_trees()
-      ->scroll_tree.UpdateScrollOffsetBaseForTesting(child->id(),
-                                                     gfx::ScrollOffset(0, 4));
-  child->test_properties()->AddChild(std::move(grand_child));
-
-  root_scrolling->test_properties()->AddChild(std::move(child));
-  root->test_properties()->AddChild(std::move(root_scrolling));
-  host_impl_->active_tree()->SetRootLayerForTesting(std::move(root));
-  host_impl_->active_tree()->DidBecomeActive();
   host_impl_->SetViewportSize(surface_size);
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
   {
     std::unique_ptr<ScrollAndScaleSet> scroll_info;
     LayerImpl* child = host_impl_->active_tree()
                            ->root_layer_for_testing()
                            ->test_properties()
                            ->children[0]
                            ->test_properties()
                            ->children[0];
     LayerImpl* grand_child = child->test_properties()->children[0];
@@ skipping 58 matching lines @@
   root_clip->test_properties()->force_render_surface = true;
   std::unique_ptr<LayerImpl> root_scroll =
       CreateScrollableLayer(1, content_size, root_clip.get());
   int root_scroll_id = root_scroll->id();
   std::unique_ptr<LayerImpl> child =
       CreateScrollableLayer(2, content_size, root_clip.get());
 
   root_scroll->test_properties()->AddChild(std::move(child));
   root_clip->test_properties()->AddChild(std::move(root_scroll));
 
+  host_impl_->active_tree()->SetRootLayerForTesting(std::move(root_clip));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+  host_impl_->active_tree()->DidBecomeActive();
+
   host_impl_->SetViewportSize(surface_size);
-  host_impl_->active_tree()->SetRootLayerForTesting(std::move(root_clip));
-  host_impl_->active_tree()->DidBecomeActive();
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
   {
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
               host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
                                       InputHandler::WHEEL)
                   .thread);
 
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
               host_impl_->FlingScrollBegin().thread);
 
@@ skipping 29 matching lines @@
 
   int occluder_layer_id = 6;
   std::unique_ptr<LayerImpl> occluder_layer =
       LayerImpl::Create(host_impl_->active_tree(), occluder_layer_id);
   occluder_layer->SetDrawsContent(true);
   occluder_layer->SetBounds(content_size);
   occluder_layer->SetPosition(gfx::PointF());
 
   // The parent of the occluder is *above* the scroller.
   page_scale_layer->test_properties()->AddChild(std::move(occluder_layer));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point()).get(), InputHandler::WHEEL);
   EXPECT_EQ(InputHandler::SCROLL_UNKNOWN, status.thread);
   EXPECT_EQ(MainThreadScrollingReason::kFailedHitTest,
             status.main_thread_scrolling_reasons);
 }
 
 TEST_F(LayerTreeHostImplTest, ScrollUnknownScrollAncestorMismatch) {
@@ skipping 21 matching lines @@
 
   int child_scroll_layer_id = 8;
   std::unique_ptr<LayerImpl> child_scroll = CreateScrollableLayer(
       child_scroll_layer_id, content_size, child_scroll_clip.get());
 
   child_scroll->SetPosition(gfx::PointF(10.f, 10.f));
 
   child_scroll->test_properties()->AddChild(std::move(occluder_layer));
   child_scroll_clip->test_properties()->AddChild(std::move(child_scroll));
   scroll_layer->test_properties()->AddChild(std::move(child_scroll_clip));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   InputHandler::ScrollStatus status = host_impl_->ScrollBegin(
       BeginState(gfx::Point()).get(), InputHandler::WHEEL);
   EXPECT_EQ(InputHandler::SCROLL_UNKNOWN, status.thread);
   EXPECT_EQ(MainThreadScrollingReason::kFailedHitTest,
             status.main_thread_scrolling_reasons);
 }
 
 TEST_F(LayerTreeHostImplTest, NotScrollInvisibleScroller) {
   gfx::Size content_size(100, 100);
   SetupScrollAndContentsLayers(content_size);
 
   LayerImpl* root = host_impl_->active_tree()->LayerById(1);
 
   int scroll_layer_id = 2;
   LayerImpl* scroll_layer =
       host_impl_->active_tree()->LayerById(scroll_layer_id);
 
   int child_scroll_layer_id = 7;
   std::unique_ptr<LayerImpl> child_scroll =
       CreateScrollableLayer(child_scroll_layer_id, content_size, root);
   child_scroll->SetDrawsContent(false);
 
   scroll_layer->test_properties()->AddChild(std::move(child_scroll));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   // We should not have scrolled |child_scroll| even though we technically "hit"
   // it. The reason for this is that if the scrolling the scroll would not move
   // any layer that is a drawn RSLL member, then we can ignore the hit.
   //
   // Why SCROLL_STARTED? In this case, it's because we've bubbled out and
   // started scrolling the inner viewport.
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
@@ skipping 22 matching lines @@
       LayerImpl::Create(host_impl_->active_tree(), 9);
   grand_child_layer->SetDrawsContent(true);
   grand_child_layer->SetBounds(content_size);
   // Move the grand child so it's not hit by our test point.
   grand_child_layer->SetPosition(gfx::PointF(10.f, 10.f));
 
   child_layer->test_properties()->AddChild(std::move(grand_child_layer));
   invisible_scroll_layer->test_properties()->AddChild(std::move(child_layer));
   root_scroll_layer->test_properties()->AddChild(
       std::move(invisible_scroll_layer));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   // We should have scrolled |invisible_scroll_layer| as it was hit and it has
   // a descendant which is a drawn RSLL member.
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
                                     InputHandler::WHEEL)
                 .thread);
 
   EXPECT_EQ(7, host_impl_->CurrentlyScrollingLayer()->id());
@@ skipping 35 matching lines @@
   scroll_children->insert(scroll_child.get());
   invisible_scroll->test_properties()->scroll_children.reset(
       scroll_children.release());
 
   scroll_child->test_properties()->scroll_parent = invisible_scroll.get();
 
   container->test_properties()->AddChild(std::move(invisible_scroll));
   container->test_properties()->AddChild(std::move(scroll_child));
 
   scroll_layer->test_properties()->AddChild(std::move(container));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   // We should have scrolled |child_scroll| even though it is invisible.
   // The reason for this is that if the scrolling the scroll would move a layer
   // that is a drawn RSLL member, then we should accept this hit.
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_->ScrollBegin(BeginState(gfx::Point()).get(),
                                     InputHandler::WHEEL)
                 .thread);
 
   EXPECT_EQ(7, host_impl_->CurrentlyScrollingLayer()->id());
 }
 
 // Make sure LatencyInfo carried by LatencyInfoSwapPromise are passed
 // to CompositorFrameMetadata after SwapBuffers();
 TEST_F(LayerTreeHostImplTest, LatencyInfoPassedToCompositorFrameMetadata) {
   std::unique_ptr<SolidColorLayerImpl> root =
       SolidColorLayerImpl::Create(host_impl_->active_tree(), 1);
   root->SetPosition(gfx::PointF());
   root->SetBounds(gfx::Size(10, 10));
   root->SetDrawsContent(true);
   root->test_properties()->force_render_surface = true;
 
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
   FakeOutputSurface* fake_output_surface =
       static_cast<FakeOutputSurface*>(host_impl_->output_surface());
 
   ui::LatencyInfo latency_info;
   latency_info.AddLatencyNumber(
       ui::INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT, 0, 0);
   std::unique_ptr<SwapPromise> swap_promise(
       new LatencyInfoSwapPromise(latency_info));
   host_impl_->active_tree()->QueuePinnedSwapPromise(std::move(swap_promise));
-  host_impl_->SetNeedsRedraw();
 
   gfx::Rect full_frame_damage(host_impl_->DrawViewportSize());
   LayerTreeHostImpl::FrameData frame;
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
   EXPECT_TRUE(host_impl_->SwapBuffers(frame));
 
   const std::vector<ui::LatencyInfo>& metadata_latency_after =
       fake_output_surface->last_sent_frame()->metadata.latency_info;
   EXPECT_EQ(1u, metadata_latency_after.size());
   EXPECT_TRUE(metadata_latency_after[0].FindLatency(
       ui::INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT, 0, NULL));
 }
 
 TEST_F(LayerTreeHostImplTest, SelectionBoundsPassedToCompositorFrameMetadata) {
   int root_layer_id = 1;
   std::unique_ptr<SolidColorLayerImpl> root =
       SolidColorLayerImpl::Create(host_impl_->active_tree(), root_layer_id);
   root->SetPosition(gfx::PointF());
   root->SetBounds(gfx::Size(10, 10));
   root->SetDrawsContent(true);
   root->test_properties()->force_render_surface = true;
 
   host_impl_->active_tree()->SetRootLayerForTesting(std::move(root));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
   // Ensure the default frame selection bounds are empty.
   FakeOutputSurface* fake_output_surface =
       static_cast<FakeOutputSurface*>(host_impl_->output_surface());
 
   // Plumb the layer-local selection bounds.
   gfx::Point selection_top(5, 0);
   gfx::Point selection_bottom(5, 5);
   LayerSelection selection;
   selection.start.type = gfx::SelectionBound::CENTER;
   selection.start.layer_id = root_layer_id;
   selection.start.edge_bottom = selection_bottom;
   selection.start.edge_top = selection_top;
   selection.end = selection.start;
   host_impl_->active_tree()->RegisterSelection(selection);
 
   // Trigger a draw-swap sequence.
   host_impl_->SetNeedsRedraw();
 
   gfx::Rect full_frame_damage(host_impl_->DrawViewportSize());
   LayerTreeHostImpl::FrameData frame;
-  EXPECT_EQ(DRAW_SUCCESS, PrepareToDrawFrame(&frame));
+  EXPECT_EQ(DRAW_SUCCESS, host_impl_->PrepareToDraw(&frame));
   host_impl_->DrawLayers(&frame);
   host_impl_->DidDrawAllLayers(frame);
   EXPECT_TRUE(host_impl_->SwapBuffers(frame));
 
   // Ensure the selection bounds have propagated to the frame metadata.
   const Selection<gfx::SelectionBound>& selection_after =
       fake_output_surface->last_sent_frame()->metadata.selection;
   EXPECT_EQ(selection.start.type, selection_after.start.type());
   EXPECT_EQ(selection.end.type, selection_after.end.type());
   EXPECT_EQ(gfx::PointF(selection_bottom), selection_after.start.edge_bottom());
@@ skipping 184 matching lines @@
       ->scroll_tree.UpdateScrollOffsetBaseForTesting(scroll_layer->id(),
                                                      gfx::ScrollOffset(0, 10));
   host_impl_->DidChangeTopControlsPosition();
   EXPECT_TRUE(did_request_next_frame_);
   EXPECT_TRUE(did_request_redraw_);
 }
 
 TEST_F(LayerTreeHostImplWithTopControlsTest, ScrollHandledByTopControls) {
   InputHandlerScrollResult result;
   LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 200));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   host_impl_->SetViewportSize(gfx::Size(100, 100));
   host_impl_->top_controls_manager()->UpdateTopControlsState(
       BOTH, SHOWN, false);
   DrawFrame();
 
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_
                 ->ScrollBegin(BeginState(gfx::Point()).get(),
                               InputHandler::TOUCHSCREEN)
                 .thread);
@@ skipping 90 matching lines @@
       host_impl_->ScrollBy(
                     UpdateState(gfx::Point(), gfx::Vector2d(0, delta)).get())
           .did_scroll);
   EXPECT_FLOAT_EQ(0, host_impl_->top_controls_manager()->ControlsTopOffset());
   EXPECT_VECTOR_EQ(gfx::Vector2dF(0, delta * 2),
                    viewport_layer->CurrentScrollOffset());
 }
 
 TEST_F(LayerTreeHostImplWithTopControlsTest, TopControlsAnimationAtOrigin) {
   LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 200));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   host_impl_->SetViewportSize(gfx::Size(100, 200));
   host_impl_->top_controls_manager()->UpdateTopControlsState(
       BOTH, SHOWN, false);
   DrawFrame();
 
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_
                 ->ScrollBegin(BeginState(gfx::Point()).get(),
                               InputHandler::TOUCHSCREEN)
                 .thread);
@@ skipping 56 matching lines @@
       EXPECT_TRUE(host_impl_->top_controls_manager()->has_animation());
       EXPECT_TRUE(did_request_next_frame_);
     }
     host_impl_->DidFinishImplFrame();
   }
   EXPECT_FALSE(host_impl_->top_controls_manager()->has_animation());
 }
 
 TEST_F(LayerTreeHostImplWithTopControlsTest, TopControlsAnimationAfterScroll) {
   LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 200));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   host_impl_->SetViewportSize(gfx::Size(100, 100));
   host_impl_->top_controls_manager()->UpdateTopControlsState(
       BOTH, SHOWN, false);
   float initial_scroll_offset = 50;
   scroll_layer->layer_tree_impl()
       ->property_trees()
       ->scroll_tree.UpdateScrollOffsetBaseForTesting(
           scroll_layer->id(), gfx::ScrollOffset(0, initial_scroll_offset));
   DrawFrame();
 
@@ skipping 54 matching lines @@
     host_impl_->DidFinishImplFrame();
   }
   EXPECT_FALSE(host_impl_->top_controls_manager()->has_animation());
   EXPECT_EQ(-top_controls_height_,
             host_impl_->top_controls_manager()->ControlsTopOffset());
 }
 
 TEST_F(LayerTreeHostImplWithTopControlsTest,
        TopControlsAnimationAfterMainThreadFlingStopped) {
   LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 200));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
+
   host_impl_->SetViewportSize(gfx::Size(100, 100));
   host_impl_->top_controls_manager()->UpdateTopControlsState(BOTH, SHOWN,
                                                              false);
   float initial_scroll_offset = 50;
   scroll_layer->layer_tree_impl()
       ->property_trees()
       ->scroll_tree.UpdateScrollOffsetBaseForTesting(
           scroll_layer->id(), gfx::ScrollOffset(0, initial_scroll_offset));
   DrawFrame();
 
@@ skipping 53 matching lines @@
   }
   EXPECT_FALSE(host_impl_->top_controls_manager()->has_animation());
   EXPECT_EQ(-top_controls_height_,
             host_impl_->top_controls_manager()->ControlsTopOffset());
 }
 
 TEST_F(LayerTreeHostImplWithTopControlsTest,
        TopControlsScrollDeltaInOverScroll) {
   // Verifies that the overscroll delta should not have accumulated in
   // the top controls if we do a hide and show without releasing finger.
+  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 200));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
-  LayerImpl* scroll_layer = SetupScrollAndContentsLayers(gfx::Size(100, 200));
   host_impl_->SetViewportSize(gfx::Size(100, 100));
   host_impl_->top_controls_manager()->UpdateTopControlsState(BOTH, SHOWN,
                                                              false);
   DrawFrame();
 
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_
                 ->ScrollBegin(BeginState(gfx::Point()).get(),
                               InputHandler::TOUCHSCREEN)
                 .thread);
@@ skipping 116 matching lines @@
     inner_scroll->test_properties()->AddChild(std::move(outer_clip));
     page_scale->test_properties()->AddChild(std::move(inner_scroll));
     inner_clip->test_properties()->AddChild(std::move(page_scale));
 
     inner_clip->test_properties()->force_render_surface = true;
     layer_tree_impl->SetRootLayerForTesting(std::move(inner_clip));
     layer_tree_impl->SetViewportLayersFromIds(
         Layer::INVALID_ID, kPageScaleLayerId, kInnerViewportScrollLayerId,
         kOuterViewportScrollLayerId);
 
+    host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
     host_impl_->active_tree()->DidBecomeActive();
   }
 };
 
 TEST_F(LayerTreeHostImplVirtualViewportTest, ScrollBothInnerAndOuterLayer) {
   gfx::Size content_size = gfx::Size(100, 160);
   gfx::Size outer_viewport = gfx::Size(50, 80);
   gfx::Size inner_viewport = gfx::Size(25, 40);
 
   SetupVirtualViewportLayers(content_size, outer_viewport, inner_viewport);
 
   LayerImpl* outer_scroll = host_impl_->OuterViewportScrollLayer();
   LayerImpl* inner_scroll = host_impl_->InnerViewportScrollLayer();
-  SetNeedsRebuildPropertyTrees();
+
   DrawFrame();
   {
     gfx::ScrollOffset inner_expected;
     gfx::ScrollOffset outer_expected;
     EXPECT_EQ(inner_expected, inner_scroll->CurrentScrollOffset());
     EXPECT_EQ(outer_expected, outer_scroll->CurrentScrollOffset());
 
     gfx::ScrollOffset current_offset(70.f, 100.f);
 
     host_impl_->SetSynchronousInputHandlerRootScrollOffset(current_offset);
@@ skipping 11 matching lines @@
 
 TEST_F(LayerTreeHostImplVirtualViewportTest, FlingScrollBubblesToInner) {
   gfx::Size content_size = gfx::Size(200, 320);
   gfx::Size outer_viewport = gfx::Size(100, 160);
   gfx::Size inner_viewport = gfx::Size(50, 80);
 
   SetupVirtualViewportLayers(content_size, outer_viewport, inner_viewport);
 
   LayerImpl* outer_scroll = host_impl_->OuterViewportScrollLayer();
   LayerImpl* inner_scroll = host_impl_->InnerViewportScrollLayer();
-  SetNeedsRebuildPropertyTrees();
+
   DrawFrame();
   {
     gfx::Vector2dF inner_expected;
     gfx::Vector2dF outer_expected;
     EXPECT_VECTOR_EQ(inner_expected, inner_scroll->CurrentScrollOffset());
     EXPECT_VECTOR_EQ(outer_expected, outer_scroll->CurrentScrollOffset());
 
     // Scrolling the viewport always sets the outer scroll layer as the
     // currently scrolling layer.
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
@@ skipping 48 matching lines @@
 TEST_F(LayerTreeHostImplVirtualViewportTest,
        DiagonalScrollBubblesPerfectlyToInner) {
   gfx::Size content_size = gfx::Size(200, 320);
   gfx::Size outer_viewport = gfx::Size(100, 160);
   gfx::Size inner_viewport = gfx::Size(50, 80);
 
   SetupVirtualViewportLayers(content_size, outer_viewport, inner_viewport);
 
   LayerImpl* outer_scroll = host_impl_->OuterViewportScrollLayer();
   LayerImpl* inner_scroll = host_impl_->InnerViewportScrollLayer();
-  SetNeedsRebuildPropertyTrees();
+
   DrawFrame();
   {
     gfx::Vector2dF inner_expected;
     gfx::Vector2dF outer_expected;
     EXPECT_VECTOR_EQ(inner_expected, inner_scroll->CurrentScrollOffset());
     EXPECT_VECTOR_EQ(outer_expected, outer_scroll->CurrentScrollOffset());
 
     // Make sure the scroll goes to the inner viewport first.
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
               host_impl_
@@ skipping 43 matching lines @@
   SetupVirtualViewportLayers(content_size, outer_viewport, inner_viewport);
 
   LayerImpl* outer_scroll = host_impl_->OuterViewportScrollLayer();
   LayerImpl* inner_scroll = host_impl_->InnerViewportScrollLayer();
 
   std::unique_ptr<LayerImpl> child =
       CreateScrollableLayer(10, outer_viewport, outer_scroll);
   LayerImpl* child_scroll = child.get();
   outer_scroll->test_properties()->children[0]->test_properties()->AddChild(
       std::move(child));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
   {
     std::unique_ptr<ScrollAndScaleSet> scroll_info;
 
     gfx::Vector2d scroll_delta(0, inner_viewport.height());
     EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
               host_impl_
                   ->ScrollBegin(BeginState(gfx::Point()).get(),
                                 InputHandler::TOUCHSCREEN)
                   .thread);
@@ skipping 47 matching lines @@
   SetupVirtualViewportLayers(content_size, outer_viewport, inner_viewport);
 
   LayerImpl* outer_scroll = host_impl_->OuterViewportScrollLayer();
   LayerImpl* inner_scroll = host_impl_->InnerViewportScrollLayer();
 
   std::unique_ptr<LayerImpl> child =
       CreateScrollableLayer(10, outer_viewport, outer_scroll);
   LayerImpl* child_scroll = child.get();
   outer_scroll->test_properties()->children[0]->test_properties()->AddChild(
       std::move(child));
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_
                 ->RootScrollBegin(BeginState(gfx::Point()).get(),
                                   InputHandler::TOUCHSCREEN)
                 .thread);
   EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), inner_scroll);
   host_impl_->ScrollEnd(EndState().get());
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_
                 ->ScrollBegin(BeginState(gfx::Point()).get(),
                               InputHandler::TOUCHSCREEN)
                 .thread);
   EXPECT_EQ(host_impl_->CurrentlyScrollingLayer(), child_scroll);
   host_impl_->ScrollEnd(EndState().get());
 }
 
 TEST_F(LayerTreeHostImplVirtualViewportTest,
        NoOverscrollWhenInnerViewportCantScroll) {
   InputHandlerScrollResult scroll_result;
   gfx::Size content_size = gfx::Size(100, 160);
   gfx::Size outer_viewport = gfx::Size(50, 80);
   gfx::Size inner_viewport = gfx::Size(25, 40);
   SetupVirtualViewportLayers(content_size, outer_viewport, inner_viewport);
   // Make inner viewport unscrollable.
   LayerImpl* inner_scroll = host_impl_->InnerViewportScrollLayer();
   inner_scroll->set_user_scrollable_horizontal(false);
   inner_scroll->set_user_scrollable_vertical(false);
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+
   DrawFrame();
 
   // Ensure inner viewport doesn't react to scrolls (test it's unscrollable).
   EXPECT_VECTOR_EQ(gfx::Vector2dF(), inner_scroll->CurrentScrollOffset());
   EXPECT_EQ(InputHandler::SCROLL_ON_IMPL_THREAD,
             host_impl_
                 ->ScrollBegin(BeginState(gfx::Point()).get(),
                               InputHandler::TOUCHSCREEN)
                 .thread);
   scroll_result = host_impl_->ScrollBy(
@@ skipping 47 matching lines @@
   host_impl_->SetExternalTilePriorityConstraints(external_viewport,
                                                  external_transform);
   host_impl_->OnDraw(external_transform, external_viewport, external_clip,
                      resourceless_software_draw);
   EXPECT_TRANSFORMATION_MATRIX_EQ(
       external_transform, layer->draw_properties().target_space_transform);
 }
 
 TEST_F(LayerTreeHostImplTest, ExternalTransformSetNeedsRedraw) {
   SetupRootLayerImpl(LayerImpl::Create(host_impl_->active_tree(), 1));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
   const gfx::Size viewport_size(100, 100);
   host_impl_->SetViewportSize(viewport_size);
 
   const gfx::Transform transform_for_tile_priority;
   const gfx::Transform draw_transform;
   const gfx::Rect viewport_for_tile_priority1(viewport_size);
   const gfx::Rect viewport_for_tile_priority2(50, 50);
   const gfx::Rect draw_viewport(viewport_size);
   const gfx::Rect clip(viewport_size);
@@ skipping 11 matching lines @@
   host_impl_->SetExternalTilePriorityConstraints(viewport_for_tile_priority2,
                                                  transform_for_tile_priority);
   EXPECT_TRUE(did_request_redraw_);
   host_impl_->OnDraw(draw_transform, draw_viewport, clip,
                      resourceless_software_draw);
   EXPECT_FALSE(last_on_draw_frame_->has_no_damage);
 }
 
 TEST_F(LayerTreeHostImplTest, OnDrawConstraintSetNeedsRedraw) {
   SetupRootLayerImpl(LayerImpl::Create(host_impl_->active_tree(), 1));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
   const gfx::Size viewport_size(100, 100);
   host_impl_->SetViewportSize(viewport_size);
 
   const gfx::Transform draw_transform;
   const gfx::Rect draw_viewport1(viewport_size);
   const gfx::Rect draw_viewport2(50, 50);
   const gfx::Rect clip(viewport_size);
   bool resourceless_software_draw = false;
 
@@ skipping 21 matching lines @@
 class ResourcelessSoftwareLayerTreeHostImplTest : public LayerTreeHostImplTest {
  protected:
   std::unique_ptr<OutputSurface> CreateOutputSurface() override {
     return FakeOutputSurface::Create3dWithResourcelessSoftwareSupport();
   }
 };
 
 TEST_F(ResourcelessSoftwareLayerTreeHostImplTest,
        ResourcelessSoftwareSetNeedsRedraw) {
   SetupRootLayerImpl(LayerImpl::Create(host_impl_->active_tree(), 1));
+  host_impl_->active_tree()->BuildPropertyTreesForTesting();
 
   const gfx::Size viewport_size(100, 100);
   host_impl_->SetViewportSize(viewport_size);
 
   const gfx::Transform draw_transform;
   const gfx::Rect draw_viewport(viewport_size);
   const gfx::Rect clip(viewport_size);
   bool resourceless_software_draw = false;
 
   // Clear any damage.
@@ skipping 25 matching lines @@
       FakeRasterSource::CreateFilled(viewport_size));
   std::unique_ptr<FakePictureLayerImpl> layer(
       FakePictureLayerImpl::CreateWithRasterSource(host_impl_->pending_tree(),
                                                    11, raster_source));
   layer->SetBounds(viewport_size);
   layer->SetDrawsContent(true);
   host_impl_->pending_tree()->SetRootLayerForTesting(std::move(layer));
 
   host_impl_->pending_tree()->BuildLayerListAndPropertyTreesForTesting();
   host_impl_->ActivateSyncTree();
-  host_impl_->active_tree()->SetRootLayerFromLayerListForTesting();
 
   const gfx::Transform draw_transform;
   const gfx::Rect draw_viewport(viewport_size);
   const gfx::Rect clip(viewport_size);
   bool resourceless_software_draw = false;
 
   // Regular draw causes UpdateTiles.
   did_request_prepare_tiles_ = false;
   host_impl_->OnDraw(draw_transform, draw_viewport, clip,
                      resourceless_software_draw);
@@ skipping 44 matching lines @@
   EXPECT_TRUE(host_impl_->active_tree()->needs_update_draw_properties());
 }
 
 TEST_F(LayerTreeHostImplTest, ExternalViewportAffectsVisibleRects) {
   const gfx::Size layer_size(100, 100);
   SetupScrollAndContentsLayers(layer_size);
   LayerImpl* content_layer = host_impl_->active_tree()
                                  ->OuterViewportScrollLayer()
                                  ->test_properties()
                                  ->children[0];
-  SetNeedsRebuildPropertyTrees();
-  RebuildPropertyTrees();
 
   bool update_lcd_text = false;
 
   host_impl_->SetViewportSize(gfx::Size(90, 90));
   host_impl_->active_tree()->UpdateDrawProperties(update_lcd_text);
   EXPECT_EQ(gfx::Rect(90, 90), content_layer->visible_layer_rect());
 
   gfx::Transform external_transform;
   gfx::Rect external_viewport(10, 20);
   gfx::Rect external_clip(layer_size);
@@ skipping 14 matching lines @@
   EXPECT_EQ(gfx::Rect(90, 90), content_layer->visible_layer_rect());
 }
 
 TEST_F(LayerTreeHostImplTest, ExternalTransformAffectsVisibleRects) {
   const gfx::Size layer_size(100, 100);
   SetupScrollAndContentsLayers(layer_size);
   LayerImpl* content_layer = host_impl_->active_tree()
                                  ->OuterViewportScrollLayer()
                                  ->test_properties()
                                  ->children[0];
-  SetNeedsRebuildPropertyTrees();
-  RebuildPropertyTrees();
 
   bool update_lcd_text = false;
 
   host_impl_->SetViewportSize(gfx::Size(50, 50));
   host_impl_->active_tree()->UpdateDrawProperties(update_lcd_text);
   EXPECT_EQ(gfx::Rect(50, 50), content_layer->visible_layer_rect());
 
   gfx::Transform external_transform;
   external_transform.Translate(10, 10);
   external_transform.Scale(2, 2);
@@ skipping 28 matching lines @@
                                  ->children[0];
   content_layer->test_properties()->AddChild(
       LayerImpl::Create(host_impl_->active_tree(), 100));
   LayerImpl* test_layer = host_impl_->active_tree()->LayerById(100);
   test_layer->test_properties()->force_render_surface = true;
   test_layer->SetDrawsContent(true);
   test_layer->SetBounds(layer_size);
   gfx::Transform perspective_transform;
   perspective_transform.ApplyPerspectiveDepth(2);
   test_layer->SetTransform(perspective_transform);
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
-  SetNeedsRebuildPropertyTrees();
-  RebuildPropertyTrees();
   bool update_lcd_text = false;
 
   host_impl_->SetViewportSize(gfx::Size(50, 50));
   host_impl_->active_tree()->UpdateDrawProperties(update_lcd_text);
   TransformNode* node =
       host_impl_->active_tree()->property_trees()->transform_tree.Node(
           test_layer->transform_tree_index());
   EXPECT_EQ(node->data.sublayer_scale, gfx::Vector2dF(1.f, 1.f));
 
   gfx::Transform external_transform;
@@ skipping 22 matching lines @@
   node = host_impl_->active_tree()->property_trees()->transform_tree.Node(
       test_layer->transform_tree_index());
   EXPECT_EQ(node->data.sublayer_scale, gfx::Vector2dF(1.f, 1.f));
 }
 
 TEST_F(LayerTreeHostImplTest, ScrollAnimated) {
   const gfx::Size content_size(1000, 1000);
   const gfx::Size viewport_size(50, 100);
   CreateBasicVirtualViewportLayers(viewport_size, content_size);
 
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   base::TimeTicks start_time =
       base::TimeTicks() + base::TimeDelta::FromMilliseconds(100);
 
   BeginFrameArgs begin_frame_args =
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE);
 
   EXPECT_EQ(
       InputHandler::SCROLL_ON_IMPL_THREAD,
@@ skipping 173 matching lines @@
   EXPECT_EQ(NULL, host_impl_->CurrentlyScrollingLayer());
   host_impl_->DidFinishImplFrame();
 }
 
 // Evolved from LayerTreeHostImplTest.ScrollAnimated.
 TEST_F(LayerTreeHostImplTimelinesTest, ScrollAnimated) {
   const gfx::Size content_size(1000, 1000);
   const gfx::Size viewport_size(500, 500);
   CreateBasicVirtualViewportLayers(viewport_size, content_size);
 
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   base::TimeTicks start_time =
       base::TimeTicks() + base::TimeDelta::FromMilliseconds(100);
 
   BeginFrameArgs begin_frame_args =
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE);
 
   EXPECT_EQ(
       InputHandler::SCROLL_ON_IMPL_THREAD,
@@ skipping 52 matching lines @@
   const gfx::Size content_size(200, 200);
   const gfx::Size viewport_size(100, 100);
   CreateBasicVirtualViewportLayers(viewport_size, content_size);
 
   LayerImpl* outer_scroll_layer = host_impl_->OuterViewportScrollLayer();
   LayerImpl* inner_scroll_layer = host_impl_->InnerViewportScrollLayer();
 
   // Zoom into the page by a 2X factor
   float min_page_scale = 1.f, max_page_scale = 4.f;
   float page_scale_factor = 2.f;
-  RebuildPropertyTrees();
   host_impl_->active_tree()->PushPageScaleFromMainThread(
       page_scale_factor, min_page_scale, max_page_scale);
   host_impl_->active_tree()->SetPageScaleOnActiveTree(page_scale_factor);
   host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
   // Scroll by a small amount, there should be no bubbling to the outer
   // viewport.
   base::TimeTicks start_time =
       base::TimeTicks() + base::TimeDelta::FromMilliseconds(250);
   BeginFrameArgs begin_frame_args =
@@ skipping 70 matching lines @@
   const gfx::Size content_size(200, 200);
   const gfx::Size viewport_size(100, 100);
   CreateBasicVirtualViewportLayers(viewport_size, content_size);
 
   LayerImpl* outer_scroll_layer = host_impl_->OuterViewportScrollLayer();
   LayerImpl* inner_scroll_layer = host_impl_->InnerViewportScrollLayer();
 
   // Zoom into the page by a 2X factor
   float min_page_scale = 1.f, max_page_scale = 4.f;
   float page_scale_factor = 2.f;
-  RebuildPropertyTrees();
   host_impl_->active_tree()->PushPageScaleFromMainThread(
       page_scale_factor, min_page_scale, max_page_scale);
   host_impl_->active_tree()->SetPageScaleOnActiveTree(page_scale_factor);
 
   // Scroll the inner viewport.
   base::TimeTicks start_time =
       base::TimeTicks() + base::TimeDelta::FromMilliseconds(50);
   BeginFrameArgs begin_frame_args =
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE);
   EXPECT_EQ(
@@ skipping 32 matching lines @@
 
 // Test that smooth scroll offset animation doesn't happen for non user
 // scrollable layers.
 TEST_F(LayerTreeHostImplTimelinesTest, ScrollAnimatedNotUserScrollable) {
   const gfx::Size content_size(1000, 1000);
   const gfx::Size viewport_size(500, 500);
   CreateBasicVirtualViewportLayers(viewport_size, content_size);
 
   host_impl_->OuterViewportScrollLayer()->set_user_scrollable_vertical(true);
   host_impl_->OuterViewportScrollLayer()->set_user_scrollable_horizontal(false);
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
 
-  SetNeedsRebuildPropertyTrees();
   DrawFrame();
 
   base::TimeTicks start_time =
       base::TimeTicks() + base::TimeDelta::FromMilliseconds(100);
 
   BeginFrameArgs begin_frame_args =
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE);
 
   EXPECT_EQ(
       InputHandler::SCROLL_ON_IMPL_THREAD,
@@ skipping 49 matching lines @@
 }
 
 // Test that smooth scrolls clamp correctly when bounds change mid-animation.
 TEST_F(LayerTreeHostImplTimelinesTest, ScrollAnimatedChangingBounds) {
   const gfx::Size old_content_size(1000, 1000);
   const gfx::Size new_content_size(750, 750);
   const gfx::Size viewport_size(500, 500);
 
   LayerImpl* content_layer =
       CreateBasicVirtualViewportLayers(viewport_size, old_content_size);
-  SetNeedsRebuildPropertyTrees();
+
   DrawFrame();
 
   base::TimeTicks start_time =
       base::TimeTicks() + base::TimeDelta::FromMilliseconds(100);
   BeginFrameArgs begin_frame_args =
       CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE);
 
   host_impl_->ScrollAnimated(gfx::Point(), gfx::Vector2d(500, 500));
   LayerImpl* scrolling_layer = host_impl_->CurrentlyScrollingLayer();
 
   begin_frame_args.frame_time = start_time;
   host_impl_->WillBeginImplFrame(begin_frame_args);
   host_impl_->Animate();
   host_impl_->UpdateAnimationState(true);
   host_impl_->DidFinishImplFrame();
 
   content_layer->SetBounds(new_content_size);
   scrolling_layer->SetBounds(new_content_size);
-  SetNeedsRebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+
   DrawFrame();
 
   begin_frame_args.frame_time =
       start_time + base::TimeDelta::FromMilliseconds(200);
   host_impl_->WillBeginImplFrame(begin_frame_args);
   host_impl_->Animate();
   host_impl_->UpdateAnimationState(true);
   host_impl_->DidFinishImplFrame();
 
   EXPECT_EQ(gfx::ScrollOffset(250, 250),
@@ skipping 73 matching lines @@
       FakePictureLayerImpl::Create(pending_tree, 12);
   std::unique_ptr<FakePictureLayerImpl> replica_mask_layer =
       FakePictureLayerImpl::Create(pending_tree, 13);
   FakePictureLayerImpl* raw_replica_mask_layer = replica_mask_layer.get();
   replica_layer->test_properties()->SetMaskLayer(std::move(replica_mask_layer));
   raw_pending_layer->test_properties()->SetReplicaLayer(
       std::move(replica_layer));
   ASSERT_EQ(raw_replica_mask_layer, raw_pending_layer->test_properties()
                                         ->replica_layer->test_properties()
                                         ->mask_layer);
-  pending_tree->property_trees()->needs_rebuild = true;
   pending_tree->BuildLayerListAndPropertyTreesForTesting();
 
   EXPECT_EQ(2u, raw_pending_layer->did_become_active_call_count());
   EXPECT_EQ(1u, raw_mask_layer->did_become_active_call_count());
   EXPECT_EQ(0u, raw_replica_mask_layer->did_become_active_call_count());
   pending_tree->DidBecomeActive();
   EXPECT_EQ(3u, raw_pending_layer->did_become_active_call_count());
   EXPECT_EQ(2u, raw_mask_layer->did_become_active_call_count());
   EXPECT_EQ(1u, raw_replica_mask_layer->did_become_active_call_count());
 }
@@ skipping 434 matching lines @@
   host_impl_->active_tree()->PushPageScaleFromMainThread(1.f, 1.f, 3.f);
   CreateScrollAndContentsLayers(host_impl_->active_tree(), gfx::Size(100, 100));
   LayerImpl* page_scale_layer = host_impl_->active_tree()->PageScaleLayer();
   page_scale_layer->test_properties()->AddChild(
       LayerImpl::Create(host_impl_->active_tree(), 100));
 
   LayerImpl* in_subtree_of_page_scale_layer =
       host_impl_->active_tree()->LayerById(100);
   in_subtree_of_page_scale_layer->test_properties()->force_render_surface =
       true;
-  SetNeedsRebuildPropertyTrees();
-  RebuildPropertyTrees();
+  host_impl_->active_tree()->BuildLayerListAndPropertyTreesForTesting();
+
   DrawFrame();
+
   TransformNode* node =
       host_impl_->active_tree()->property_trees()->transform_tree.Node(
           in_subtree_of_page_scale_layer->transform_tree_index());
   EXPECT_EQ(node->data.sublayer_scale, gfx::Vector2dF(1.f, 1.f));
 
   host_impl_->active_tree()->SetPageScaleOnActiveTree(2.f);
+
   DrawFrame();
+
   in_subtree_of_page_scale_layer = host_impl_->active_tree()->LayerById(100);
   node = host_impl_->active_tree()->property_trees()->transform_tree.Node(
       in_subtree_of_page_scale_layer->transform_tree_index());
   EXPECT_EQ(node->data.sublayer_scale, gfx::Vector2dF(2.f, 2.f));
 }
 
 TEST_F(LayerTreeHostImplTest, JitterTest) {
   host_impl_->SetViewportSize(gfx::Size(100, 100));
 
   host_impl_->CreatePendingTree();
@@ skipping 37 matching lines @@
     //                                   layer->CurrentScrollOffset()).
     // However, layer_impl does not store scroll_offset, so it is using scroll
     // tree's scroll offset to initialize itself. Usually this approach works
     // because this is a simple assignment. However if scroll_offset's pending
     // delta is not zero, the delta would be counted twice.
     // This hacking here is to restore the damaged scroll offset.
     gfx::ScrollOffset pending_base =
         pending_tree->property_trees()
             ->scroll_tree.GetScrollOffsetBaseForTesting(
                 last_scrolled_layer->id());
-    pending_tree->property_trees()->needs_rebuild = true;
     pending_tree->BuildLayerListAndPropertyTreesForTesting();
     pending_tree->property_trees()
         ->scroll_tree.UpdateScrollOffsetBaseForTesting(
             last_scrolled_layer->id(), pending_base);
     pending_tree->LayerById(content_layer->id())->SetNeedsPushProperties();
 
     pending_tree->set_needs_update_draw_properties();
     pending_tree->UpdateDrawProperties(false);
     float jitter = LayerTreeHostCommon::CalculateLayerJitter(content_layer);
     // There should not be any jitter measured till we hit the fixed point hits
@@ skipping 25 matching lines @@
 
   // Re-initialize with a software output surface.
   output_surface_ = FakeOutputSurface::CreateSoftware(
       base::WrapUnique(new SoftwareOutputDevice));
   host_impl_->InitializeRenderer(output_surface_.get());
   EXPECT_FALSE(host_impl_->use_gpu_rasterization());
 }
 
 }  // namespace
 }  // namespace cc