cc: Plumb group id through animation creation and start/finish notifications

cc/layers/layer_impl.h

 // Copyright 2011 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_LAYERS_LAYER_IMPL_H_
 #define CC_LAYERS_LAYER_IMPL_H_
 
 #include <set>
 #include <string>
 
@@ skipping 92 matching lines @@
   // LayerAnimationValueObserver implementation.
   virtual void OnFilterAnimated(const FilterOperations& filters) override;
   virtual void OnOpacityAnimated(float opacity) override;
   virtual void OnTransformAnimated(const gfx::Transform& transform) override;
   virtual void OnScrollOffsetAnimated(
       const gfx::ScrollOffset& scroll_offset) override;
   virtual void OnAnimationWaitingForDeletion() override;
   virtual bool IsActive() const override;
 
   // AnimationDelegate implementation.
-  virtual void NotifyAnimationStarted(
-      base::TimeTicks monotonic_time,
-      Animation::TargetProperty target_property) override{};
+  virtual void NotifyAnimationStarted(base::TimeTicks monotonic_time,
+                                      Animation::TargetProperty target_property,
+                                      int group) override{};
   virtual void NotifyAnimationFinished(
       base::TimeTicks monotonic_time,
-      Animation::TargetProperty target_property) override;
+      Animation::TargetProperty target_property,
+      int group) override;
 
   // Tree structure.
   LayerImpl* parent() { return parent_; }
   const LayerImpl* parent() const { return parent_; }
   const OwnedLayerImplList& children() const { return children_; }
   OwnedLayerImplList& children() { return children_; }
   LayerImpl* child_at(size_t index) const { return children_[index]; }
   void AddChild(scoped_ptr<LayerImpl> child);
   scoped_ptr<LayerImpl> RemoveChild(LayerImpl* child);
   void SetParent(LayerImpl* parent);
@@ skipping 578 matching lines @@
   DrawProperties<LayerImpl> draw_properties_;
 
   scoped_refptr<base::debug::ConvertableToTraceFormat> debug_info_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_H_