cc: Remove map lookup from RenderSurfaceImpl::EffectTreeIndex

cc/trees/draw_property_utils.cc

 // Copyright 2014 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.
 
 #include "cc/trees/draw_property_utils.h"
 
 #include <stddef.h>
 
 #include <vector>
 
@@ skipping 1054 matching lines @@
 
 void ComputeVisibleRects(LayerImpl* root_layer,
                          PropertyTrees* property_trees,
                          bool can_render_to_separate_surface,
                          LayerImplList* visible_layer_list) {
   for (auto* layer : *root_layer->layer_tree_impl()) {
     UpdateRenderSurfaceForLayer(&property_trees->effect_tree,
                                 can_render_to_separate_surface, layer);
     EffectNode* node =
         property_trees->effect_tree.Node(layer->effect_tree_index());
-    if (node->owning_layer_id == layer->id())
+    if (node->owning_layer_id == layer->id()) {
       node->render_surface = layer->render_surface();
+      if (node->render_surface)
+        node->render_surface->set_effect_tree_index(node->id);
+    }
 #if DCHECK_IS_ON()
     if (can_render_to_separate_surface)
       ValidateRenderSurfaceForLayer(layer);
 #endif
   }
   ComputeVisibleRectsInternal(root_layer, property_trees,
                               can_render_to_separate_surface,
                               visible_layer_list);
 }
 
@@ skipping 372 matching lines @@
 void UpdateElasticOverscroll(PropertyTrees* property_trees,
                              const Layer* overscroll_elasticity_layer,
                              const gfx::Vector2dF& elastic_overscroll) {
   UpdateElasticOverscrollInternal(property_trees, overscroll_elasticity_layer,
                                   elastic_overscroll);
 }
 
 }  // namespace draw_property_utils
 
 }  // namespace cc