cc : Stop pushing layers from hidden subtrees at commit

cc/trees/layer_tree_impl.h

 // Copyright 2012 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_TREES_LAYER_TREE_IMPL_H_
 #define CC_TREES_LAYER_TREE_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 341 matching lines @@
   LayerImpl* LayerById(int id) const;
 
   int LayerIdByElementId(ElementId element_id) const;
   // TODO(jaydasika): this is deprecated. It is used by
   // animation/compositor-worker to look up layers to mutate, but in future, we
   // will update property trees.
   LayerImpl* LayerByElementId(ElementId element_id) const;
   void AddToElementMap(LayerImpl* layer);
   void RemoveFromElementMap(LayerImpl* layer);
 
+  using SurfaceIdsList = std::vector<const SurfaceId*>;
+  void SetHiddenSurfaceLayerIds(const SurfaceIdsList* hidden_surface_layer_ids);
+  const SurfaceIdsList* HiddenSurfaceLayerIds() const;
+  void ClearHiddenSurfaceLayerIds();
+
   void AddLayerShouldPushProperties(LayerImpl* layer);
   void RemoveLayerShouldPushProperties(LayerImpl* layer);
   std::unordered_set<LayerImpl*>& LayersThatShouldPushProperties();
   bool LayerNeedsPushPropertiesForTesting(LayerImpl* layer);
 
   // These should be called by LayerImpl's ctor/dtor.
   void RegisterLayer(LayerImpl* layer);
   void UnregisterLayer(LayerImpl* layer);
 
   // These manage ownership of the LayerImpl.
@@ skipping 207 matching lines @@
   std::unordered_map<int, int> clip_scroll_map_;
 
   // Maps scroll element ids to scrollbar layer ids. For each scroll layer,
   // there may be 1 or 2 scrollbar layers (for vertical and horizontal). (This
   // is derived from ScrollbarLayerImplBase::scroll_element_id_ and exists to
   // avoid O(n) walks.)
   // TODO(pdr): Refactor this to be more efficient--likely a map where the value
   // is a pair of scrollbar layer ids instead of using a multimap.
   std::multimap<ElementId, int> element_id_to_scrollbar_layer_ids_;
 
+  SurfaceIdsList hidden_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_;
   // After drawing the |render_surface_list_| the areas in this region
   // would not be fully covered by opaque content.
   Region unoccluded_screen_space_region_;
 
   bool viewport_size_invalid_;
@@ skipping 34 matching lines @@
   // lifecycle states. See: |LayerTreeLifecycle|.
   LayerTreeLifecycle lifecycle_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_IMPL_H_