cc: Remove map lookup from RenderSurfaceImpl::EffectTreeIndex

cc/trees/property_tree.h

Index: cc/trees/property_tree.h
diff --git a/cc/trees/property_tree.h b/cc/trees/property_tree.h
index 85a8d47a82526c98fe0788f3d3b8145dd5ccf824..c56126a05bb68a32b1da9c7ac5bce23d15083a0b 100644
--- a/cc/trees/property_tree.h
+++ b/cc/trees/property_tree.h
@@ -30,6 +30,7 @@ namespace cc {
 
 class CopyOutputRequest;
 class LayerTreeImpl;
+class RenderSurfaceImpl;
 class ScrollState;
 struct ClipNode;
 struct EffectNode;
@@ -331,6 +332,14 @@ class CC_EXPORT EffectTree final : public PropertyTree<EffectNode> {
 
   void ResetChangeTracking();
 
+  // A list of pairs of stable id and render surface, sorted by stable id.
+  using StableIdRenderSurfaceList =
+      std::vector<std::pair<int, RenderSurfaceImpl*>>;
+  StableIdRenderSurfaceList CreateStableIdRenderSurfaceList() const;
+  void UpdateRenderSurfaceEffectIds(
+      const StableIdRenderSurfaceList& stable_id_render_surface_list,
+      LayerTreeImpl* layer_tree_impl);
+
  private:
   void UpdateOpacities(EffectNode* node, EffectNode* parent_node);
   void UpdateIsDrawn(EffectNode* node, EffectNode* parent_node);