Maintain global lists of animation controllers

cc/layer_tree_host_impl.h

Index: cc/layer_tree_host_impl.h
diff --git a/cc/layer_tree_host_impl.h b/cc/layer_tree_host_impl.h
index d4aa8f5a110950fbb61769d4188a6b9b2293efc7..2a83422cfbc414685769142e21b98395e4fca331 100644
--- a/cc/layer_tree_host_impl.h
+++ b/cc/layer_tree_host_impl.h
@@ -115,6 +115,7 @@ class CC_EXPORT LayerTreeHostImpl : public InputHandlerClient,
                                     public TileManagerClient,
                                     public NON_EXPORTED_BASE(WebKit::WebCompositorOutputSurfaceClient) {
     typedef std::vector<LayerImpl*> LayerList;
+    typedef base::hash_set<LayerAnimationController*> AnimationControllerSet;
 
 public:
     static scoped_ptr<LayerTreeHostImpl> create(const LayerTreeSettings&, LayerTreeHostImplClient*, Proxy*);
@@ -240,9 +241,7 @@ public:
 
     bool hasTransparentBackground() const { return m_hasTransparentBackground; }
     void setHasTransparentBackground(bool transparent) { m_hasTransparentBackground = transparent; }
-
-    bool needsAnimateLayers() const { return m_needsAnimateLayers; }
-    void setNeedsAnimateLayers() { m_needsAnimateLayers = true; }
+    bool needsAnimateLayers() const;
 
     void setNeedsRedraw();
 
@@ -356,7 +355,6 @@ private:
     bool m_hasTransparentBackground;
 
     // If this is true, it is necessary to traverse the layer tree ticking the animators.
-    bool m_needsAnimateLayers;
     bool m_pinchGestureActive;
     gfx::Point m_previousPinchAnchor;