cc: Move OnScrollOffsetAnimated to scroll tree

cc/trees/layer_tree_host_unittest_animation.cc

 // Copyright 2012 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.h"
 
 #include <stdint.h>
 
 #include "cc/animation/animation_curve.h"
 #include "cc/animation/animation_host.h"
@@ skipping 754 matching lines @@
  public:
   LayerTreeHostAnimationTestScrollOffsetAnimationTakeover() {}
 
   void SetupTree() override {
     LayerTreeHostAnimationTest::SetupTree();
 
     scroll_layer_ = FakePictureLayer::Create(&client_);
     scroll_layer_->SetBounds(gfx::Size(10000, 10000));
     client_.set_bounds(scroll_layer_->bounds());
     scroll_layer_->SetScrollOffset(gfx::ScrollOffset(10, 20));
+    scroll_layer_->SetScrollClipLayerId(layer_tree()->root_layer()->id());
     layer_tree()->root_layer()->AddChild(scroll_layer_);
 
     AttachPlayersToTimeline();
     player_child_->AttachElement(scroll_layer_->element_id());
     // Allows NotifyAnimationTakeover to get called.
     player_child_->set_animation_delegate(this);
   }
 
   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 
@@ skipping 43 matching lines @@
  public:
   LayerTreeHostAnimationTestScrollOffsetAnimationAdjusted() {}
 
   void SetupTree() override {
     LayerTreeHostAnimationTest::SetupTree();
 
     scroll_layer_ = FakePictureLayer::Create(&client_);
     scroll_layer_->SetBounds(gfx::Size(10000, 10000));
     client_.set_bounds(scroll_layer_->bounds());
     scroll_layer_->SetScrollOffset(gfx::ScrollOffset(10, 20));
+    scroll_layer_->SetScrollClipLayerId(layer_tree()->root_layer()->id());
     layer_tree()->root_layer()->AddChild(scroll_layer_);
 
     AttachPlayersToTimeline();
     player_child_->AttachElement(scroll_layer_->element_id());
   }
 
   void BeginTest() override { PostSetNeedsCommitToMainThread(); }
 
   void DidCommit() override {
     if (layer_tree_host()->SourceFrameNumber() == 1) {
@@ skipping 1008 matching lines @@
  private:
   scoped_refptr<Layer> layer_;
   FakeContentLayerClient client_;
 };
 
 MULTI_THREAD_TEST_F(
     LayerTreeHostAnimationTestRebuildPropertyTreesOnAnimationSetNeedsCommit);
 
 }  // namespace
 }  // namespace cc