cc : Stop pushing layers from hidden subtrees at commit

cc/trees/layer_tree_impl.h

Index: cc/trees/layer_tree_impl.h
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index ccff3c2447bfcb393ab6ae4e38a813d4c3dec2b4..e41b59e8ee2313fb7be9597be600dca02b489dff 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -359,6 +359,10 @@ class CC_EXPORT LayerTreeImpl {
   void AddToElementMap(LayerImpl* layer);
   void RemoveFromElementMap(LayerImpl* layer);
 
+  void SetSurfaceLayerIds(const std::vector<SurfaceId>& surface_layer_ids);
+  const std::vector<SurfaceId>& SurfaceLayerIds() const;
+  void ClearSurfaceLayerIds();
+
   void AddLayerShouldPushProperties(LayerImpl* layer);
   void RemoveLayerShouldPushProperties(LayerImpl* layer);
   std::unordered_set<LayerImpl*>& LayersThatShouldPushProperties();
@@ -445,10 +449,6 @@ class CC_EXPORT LayerTreeImpl {
   void RegisterScrollLayer(LayerImpl* layer);
   void UnregisterScrollLayer(LayerImpl* layer);
 
-  void AddSurfaceLayer(LayerImpl* layer);
-  void RemoveSurfaceLayer(LayerImpl* layer);
-  const LayerImplList& SurfaceLayers() const { return surface_layers_; }
-
   LayerImpl* FindFirstScrollingLayerOrDrawnScrollbarThatIsHitByPoint(
       const gfx::PointF& screen_space_point);
 
@@ -587,8 +587,9 @@ class CC_EXPORT LayerTreeImpl {
   base::flat_map<ElementId, ScrollbarLayerIds>
       element_id_to_scrollbar_layer_ids_;
 
+  std::vector<SurfaceId> surface_layer_ids_;
+
   std::vector<PictureLayerImpl*> picture_layers_;
-  LayerImplList surface_layers_;
 
   // List of render surfaces for the most recently prepared frame.
   RenderSurfaceList render_surface_list_;