Ref count layer animation controllers.

cc/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_LAYER_TREE_IMPL_H_
 #define CC_LAYER_TREE_IMPL_H_
 
 #include "base/hash_tables.h"
+#include "cc/animation_registrar.h"
 #include "cc/layer_impl.h"
 
 #if defined(COMPILER_GCC)
 namespace BASE_HASH_NAMESPACE {
 template<>
 struct hash<cc::LayerImpl*> {
   size_t operator()(cc::LayerImpl* ptr) const {
     return hash<size_t>()(reinterpret_cast<size_t>(ptr));
   }
 };
 } // namespace BASE_HASH_NAMESPACE
 #endif // COMPILER
 
 namespace cc {
 
 class DebugRectHistory;
 class FrameRateCounter;
 class HeadsUpDisplayLayerImpl;
 class LayerTreeDebugState;
 class LayerTreeHostImpl;
 class LayerTreeImpl;
 class LayerTreeSettings;
 class OutputSurface;
 class ResourceProvider;
 class TileManager;
 
-class CC_EXPORT LayerTreeImpl {
+class CC_EXPORT LayerTreeImpl : public AnimationRegistrar {
  public:
   static scoped_ptr<LayerTreeImpl> create(LayerTreeHostImpl* layer_tree_host_impl)
   {
     return make_scoped_ptr(new LayerTreeImpl(layer_tree_host_impl));
   }
   virtual ~LayerTreeImpl();
 
   // Methods called by the layer tree that pass-through or access LTHI.
   // ---------------------------------------------------------------------------
   const LayerTreeSettings& settings() const;
@@ skipping 42 matching lines @@
 
   LayerImpl* LayerById(int id);
 
   // These should be called by LayerImpl's ctor/dtor.
   void RegisterLayer(LayerImpl* layer);
   void UnregisterLayer(LayerImpl* layer);
 
 protected:
   LayerTreeImpl(LayerTreeHostImpl* layer_tree_host_impl);
 
+  // AnimationRegistrar implementation.
+  virtual scoped_refptr<LayerAnimationController> GetAnimationControllerForId(int id) OVERRIDE;
+  virtual void DidActivateAnimationController(LayerAnimationController*) OVERRIDE;
+  virtual void DidDeactivateAnimationController(LayerAnimationController*) OVERRIDE;
+  virtual void RegisterAnimationController(LayerAnimationController*) OVERRIDE;
+  virtual void UnregisterAnimationController(LayerAnimationController*) OVERRIDE;
+
   LayerTreeHostImpl* layer_tree_host_impl_;
   int source_frame_number_;
   scoped_ptr<LayerImpl> root_layer_;
   HeadsUpDisplayLayerImpl* hud_layer_;
   LayerImpl* root_scroll_layer_;
   LayerImpl* currently_scrolling_layer_;
 
   typedef base::hash_map<int, LayerImpl*> LayerIdMap;
   LayerIdMap layer_id_map_;
 
   // Persisted state
   int scrolling_layer_id_from_previous_tree_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }
 
 #endif  // CC_LAYER_TREE_IMPL_H_