Move page scale animation from LayerTreeHostImpl to LayerTreeImpl

cc/trees/layer_tree_impl.h

 // 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.
 
 #ifndef CC_TREES_LAYER_TREE_IMPL_H_
 #define CC_TREES_LAYER_TREE_IMPL_H_
 
 #include <list>
 #include <set>
 #include <string>
@@ skipping 30 matching lines @@
 class DebugRectHistory;
 class FrameRateCounter;
 class HeadsUpDisplayLayerImpl;
 class LayerScrollOffsetDelegateProxy;
 class LayerTreeDebugState;
 class LayerTreeHostImpl;
 class LayerTreeImpl;
 class LayerTreeSettings;
 class MemoryHistory;
 class OutputSurface;
+class PageScaleAnimation;
 class PaintTimeCounter;
 class PictureLayerImpl;
 class Proxy;
 class ResourceProvider;
 class TileManager;
 class UIResourceRequest;
 struct RendererCapabilities;
 struct SelectionHandle;
 
 typedef std::list<UIResourceRequest> UIResourceRequestQueue;
@@ skipping 253 matching lines @@
   float top_controls_delta() const {
     return top_controls_delta_;
   }
   float sent_top_controls_delta() const {
     return sent_top_controls_delta_;
   }
   float total_top_controls_content_offset() const {
     return top_controls_content_offset_ + top_controls_delta_;
   }
 
+  void SetPageScaleAnimation(
+      const gfx::Vector2d& target_offset,
+      bool anchor_point,
+      float page_scale,
+      base::TimeDelta duration);
+  scoped_ptr<PageScaleAnimation> TakePageScaleAnimation();
+
  protected:
   explicit LayerTreeImpl(LayerTreeHostImpl* layer_tree_host_impl);
   void ReleaseResourcesRecursive(LayerImpl* current);
 
   LayerTreeHostImpl* layer_tree_host_impl_;
   int source_frame_number_;
   scoped_ptr<LayerImpl> root_layer_;
   HeadsUpDisplayLayerImpl* hud_layer_;
   LayerImpl* currently_scrolling_layer_;
   LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate_;
@@ skipping 51 matching lines @@
   // viewport resize) in Blink. i.e. How much the viewport was shrunk by the top
   // controls.
   float top_controls_layout_height_;
 
   // The up-to-date content offset of the top controls, i.e. the amount that the
   // web contents have been shifted down from the top of the device viewport.
   float top_controls_content_offset_;
   float top_controls_delta_;
   float sent_top_controls_delta_;
 
+  scoped_ptr<PageScaleAnimation> page_scale_animation_;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_IMPL_H_