cc/blimp: Add synchronization for scroll/scale state.

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 <map>
 #include <set>
 #include <string>
@@ skipping 33 matching lines @@
 class LayerTreeSettings;
 class MemoryHistory;
 class PageScaleAnimation;
 class PictureLayerImpl;
 class TaskRunnerProvider;
 class ResourceProvider;
 class TileManager;
 class UIResourceRequest;
 class VideoFrameControllerClient;
 struct PendingPageScaleAnimation;
+struct ReflectedMainFrameState;
 
 typedef std::vector<UIResourceRequest> UIResourceRequestQueue;
 typedef SyncedProperty<AdditionGroup<float>> SyncedTopControls;
 typedef SyncedProperty<AdditionGroup<gfx::Vector2dF>> SyncedElasticOverscroll;
 
 class CC_EXPORT LayerTreeImpl {
  public:
   // This is the number of times a fixed point has to be hit contiuously by a
   // layer to consider it as jittering.
   enum : int { kFixedPointHitsThreshold = 3 };
@@ skipping 88 matching lines @@
 
   int source_frame_number() const { return source_frame_number_; }
   void set_source_frame_number(int frame_number) {
     source_frame_number_ = frame_number;
   }
 
   bool is_first_frame_after_commit() const {
     return source_frame_number_ != is_first_frame_after_commit_tracker_;
   }
 
+  void SetReflectedMainFrameState(
+      std::unique_ptr<ReflectedMainFrameState> reflected_main_frame_state);
+  void ApplyReflectedMainFrameState();
+
   void set_is_first_frame_after_commit(bool is_first_frame_after_commit) {
     is_first_frame_after_commit_tracker_ =
         is_first_frame_after_commit ? -1 : source_frame_number_;
   }
 
   HeadsUpDisplayLayerImpl* hud_layer() { return hud_layer_; }
   void set_hud_layer(HeadsUpDisplayLayerImpl* layer_impl) {
     hud_layer_ = layer_impl;
   }
 
@@ skipping 383 matching lines @@
   bool top_controls_shrink_blink_size_;
   float top_controls_height_;
   float bottom_controls_height_;
 
   // The amount that the top controls are shown from 0 (hidden) to 1 (fully
   // shown).
   scoped_refptr<SyncedTopControls> top_controls_shown_ratio_;
 
   std::unique_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 
+  std::unique_ptr<ReflectedMainFrameState> reflected_main_frame_state_;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_IMPL_H_