cc : Store surface layer ids on LayerTreeHost and push them 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 312 matching lines @@
   }
 
   bool is_in_resourceless_software_draw_mode() {
     return (layer_tree_host_impl_->GetDrawMode() ==
             DRAW_MODE_RESOURCELESS_SOFTWARE);
   }
 
   void set_needs_full_tree_sync(bool needs) { needs_full_tree_sync_ = needs; }
   bool needs_full_tree_sync() const { return needs_full_tree_sync_; }
 
+  bool needs_surface_ids_sync() const { return needs_surface_ids_sync_; }
+  void set_needs_surface_ids_sync(bool needs_surface_ids_sync) {
+    needs_surface_ids_sync_ = needs_surface_ids_sync;
+  }
+
   void ForceRedrawNextActivation() { next_activation_forces_redraw_ = true; }
 
   void set_has_ever_been_drawn(bool has_drawn) {
     has_ever_been_drawn_ = has_drawn;
   }
   bool has_ever_been_drawn() const { return has_ever_been_drawn_; }
 
   void set_ui_resource_request_queue(UIResourceRequestQueue queue);
 
   const RenderSurfaceList& GetRenderSurfaceList() const;
   const Region& UnoccludedScreenSpaceRegion() const;
 
   // These return the size of the root scrollable area and the size of
   // the user-visible scrolling viewport, in CSS layout coordinates.
   gfx::SizeF ScrollableSize() const;
   gfx::SizeF ScrollableViewportSize() const;
 
   gfx::Rect RootScrollLayerDeviceViewportBounds() const;
 
   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);
 
+  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();
   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 66 matching lines @@
     return picture_layers_;
   }
 
   void RegisterScrollbar(ScrollbarLayerImplBase* scrollbar_layer);
   void UnregisterScrollbar(ScrollbarLayerImplBase* scrollbar_layer);
   ScrollbarSet ScrollbarsFor(ElementId scroll_element_id) const;
 
   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);
 
   LayerImpl* FindLayerThatIsHitByPoint(const gfx::PointF& screen_space_point);
 
   LayerImpl* FindLayerThatIsHitByPointInTouchHandlerRegion(
       const gfx::PointF& screen_space_point);
 
   void RegisterSelection(const LayerSelection& selection);
 
@@ skipping 119 matching lines @@
   struct ScrollbarLayerIds {
     int horizontal = Layer::INVALID_ID;
     int vertical = Layer::INVALID_ID;
   };
   // Each scroll layer can have up to two scrollbar layers (vertical and
   // horizontal). This mapping is maintained as part of scrollbar registration.
   base::flat_map<ElementId, ScrollbarLayerIds>
       element_id_to_scrollbar_layer_ids_;
 
   std::vector<PictureLayerImpl*> picture_layers_;
-  LayerImplList surface_layers_;
+
+  std::vector<SurfaceId> surface_layer_ids_;
 
   // 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_;
   bool needs_update_draw_properties_;
 
   // In impl-side painting mode, this is true when the tree may contain
   // structural differences relative to the active tree.
   bool needs_full_tree_sync_;
 
+  bool needs_surface_ids_sync_;
+
   bool next_activation_forces_redraw_;
 
   bool has_ever_been_drawn_;
 
   bool handle_visibility_changed_;
 
   std::vector<std::unique_ptr<SwapPromise>> swap_promise_list_;
   std::vector<std::unique_ptr<SwapPromise>> pinned_swap_promise_list_;
 
   UIResourceRequestQueue ui_resource_request_queue_;
@@ skipping 18 matching lines @@
   // lifecycle states. See: |LayerTreeLifecycle|.
   LayerTreeLifecycle lifecycle_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_IMPL_H_