cc : Stop pushing layers from hidden subtrees at commit

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index 51622245b1ef7feacc27912658df618094697975..996a068ffd5732f672922250446bf4422062b690 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -355,6 +355,11 @@ class CC_EXPORT LayerTreeHost : public NON_EXPORTED_BASE(SurfaceReferenceOwner),
   void SetHasCopyRequest(bool has_copy_request);
   bool has_copy_request() const { return has_copy_request_; }
 
+  void AddSurfaceLayerId(const SurfaceId& surface_id);
+  void RemoveSurfaceLayerId(const SurfaceId& surface_id);
+  const std::vector<SurfaceId>& SurfaceLayerIds() const;
+  void ClearSurfaceLayerIds();
+
   void AddLayerShouldPushProperties(Layer* layer);
   void RemoveLayerShouldPushProperties(Layer* layer);
   std::unordered_set<Layer*>& LayersThatShouldPushProperties();
@@ -614,6 +619,8 @@ class CC_EXPORT LayerTreeHost : public NON_EXPORTED_BASE(SurfaceReferenceOwner),
 
   scoped_refptr<HeadsUpDisplayLayer> hud_layer_;
 
+  std::vector<SurfaceId> surface_layer_ids_;
+
   // Set of layers that need to push properties.
   std::unordered_set<Layer*> layers_that_should_push_properties_;