Maintain global lists of animation controllers

cc/layer_tree_host.h

Index: cc/layer_tree_host.h
diff --git a/cc/layer_tree_host.h b/cc/layer_tree_host.h
index 8f3087ce6f2fe7182468084cebd29e4ad2e1ce8c..128c83a3246c96157a3b2f850d6a3307c235eb52 100644
--- a/cc/layer_tree_host.h
+++ b/cc/layer_tree_host.h
@@ -189,7 +189,7 @@ public:
     bool commitRequested() const;
 
     void setAnimationEvents(scoped_ptr<AnimationEventsVector>, base::Time wallClockTime);
-    virtual void didAddAnimation();
+    virtual void didAddAnimation() { }
 
     Layer* rootLayer() { return m_rootLayer.get(); }
     const Layer* rootLayer() const { return m_rootLayer.get(); }
@@ -268,7 +268,6 @@ private:
     void setAnimationEventsRecursive(const AnimationEventsVector&, Layer*, base::Time wallClockTime);
 
     bool m_animating;
-    bool m_needsAnimateLayers;
     bool m_needsFullTreeSync;
 
     base::CancelableClosure m_prepaintCallback;