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

cc/trees/layer_tree.h

 // Copyright 2016 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_H_
 #define CC_TREES_LAYER_TREE_H_
 
 #include <memory>
 #include <unordered_map>
 #include <unordered_set>
@@ skipping 24 matching lines @@
 
 class AnimationHost;
 class ClientPictureCache;
 class EnginePictureCache;
 class HeadsUpDisplayLayer;
 class Layer;
 class LayerTreeHost;
 class LayerTreeImpl;
 class LayerTreeSettings;
 struct PendingPageScaleAnimation;
+struct ReflectedMainFrameState;
 class UIResourceManager;
 class SwapPromiseManager;
 class SurfaceSequenceGenerator;
 
 class CC_EXPORT LayerTree : public MutatorHostClient {
  public:
   using LayerSet = std::unordered_set<Layer*>;
   using LayerIdMap = std::unordered_map<int, Layer*>;
 
   LayerTree(std::unique_ptr<AnimationHost> animation_host,
@@ skipping 40 matching lines @@
   }
 
   void SetTopControlsHeight(float height, bool shrink);
   void SetTopControlsShownRatio(float ratio);
   void SetBottomControlsHeight(float height);
 
   void SetPageScaleFactorAndLimits(float page_scale_factor,
                                    float min_page_scale_factor,
                                    float max_page_scale_factor);
   float page_scale_factor() const { return inputs_.page_scale_factor; }
+  float min_page_scale_factor() const { return inputs_.min_page_scale_factor; }
+  float max_page_scale_factor() const { return inputs_.max_page_scale_factor; }
 
   void set_background_color(SkColor color) { inputs_.background_color = color; }
   SkColor background_color() const { return inputs_.background_color; }
 
   void set_has_transparent_background(bool transparent) {
     inputs_.has_transparent_background = transparent;
   }
 
   void StartPageScaleAnimation(const gfx::Vector2d& target_offset,
                                bool use_anchor,
@@ skipping 10 matching lines @@
   const gfx::ColorSpace& device_color_space() const {
     return inputs_.device_color_space;
   }
 
   // Used externally by blink for setting the PropertyTrees when
   // |settings_.use_layer_lists| is true. This is a SPV2 setting.
   PropertyTrees* property_trees() { return &property_trees_; }
 
   void SetNeedsDisplayOnAllLayers();
 
+  void SetReflectedMainFrameState(
+      std::unique_ptr<ReflectedMainFrameState> reflected_main_frame_state);
+
   void SetNeedsCommit();
 
   const LayerTreeSettings& GetSettings() const;
 
   // Methods which should only be used internally in cc ------------------
   void RegisterLayer(Layer* layer);
   void UnregisterLayer(Layer* layer);
   Layer* LayerById(int id) const;
 
   bool UpdateLayers(const LayerList& update_layer_list,
@@ skipping 122 matching lines @@
 
     LayerSelection selection;
 
     gfx::Size device_viewport_size;
 
     bool have_scroll_event_handlers;
     EventListenerProperties event_listener_properties[static_cast<size_t>(
         EventListenerClass::kNumClasses)];
 
     std::unique_ptr<PendingPageScaleAnimation> pending_page_scale_animation;
+
+    std::unique_ptr<ReflectedMainFrameState> reflected_main_frame_state;
   };
 
   Inputs inputs_;
 
   PropertyTrees property_trees_;
 
   bool needs_full_tree_sync_;
   bool needs_meta_info_recomputation_;
 
   gfx::Vector2dF elastic_overscroll_;
@@ skipping 18 matching lines @@
   // external embedder.
   EnginePictureCache* engine_picture_cache_;
   ClientPictureCache* client_picture_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTree);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_H_