cc: Add SwapPromiseManager and SurfaceSequenceGenerator.

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 20 matching lines @@
 class LayerTree;
 class LayerUpdate;
 }  // namespace proto
 
 class AnimationHost;
 class HeadsUpDisplayLayer;
 class Layer;
 class LayerTreeHost;
 class LayerTreeImpl;
 struct PendingPageScaleAnimation;
+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,
             LayerTreeHost* layer_tree_host);
   virtual ~LayerTree();
 
@@ skipping 62 matching lines @@
   float device_scale_factor() const { return inputs_.device_scale_factor; }
 
   void SetPaintedDeviceScaleFactor(float painted_device_scale_factor);
 
   // 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();
 
+  SwapPromiseManager* GetSwapPromiseManager() const;
+  SurfaceSequenceGenerator* GetSurfaceSequenceGenerator() 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,
                     bool* content_is_suitable_for_gpu);
   bool in_paint_layer_contents() const { return in_paint_layer_contents_; }
 
   void AddLayerShouldPushProperties(Layer* layer);
@@ skipping 142 matching lines @@
 
   std::unique_ptr<AnimationHost> animation_host_;
   LayerTreeHost* layer_tree_host_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTree);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_H_