cc: Remove map lookup from RenderSurfaceImpl::EffectTreeIndex

cc/layers/render_surface_impl.cc

 // Copyright 2011 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/layers/render_surface_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 17 matching lines @@
 #include "third_party/skia/include/core/SkImageFilter.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 #include "ui/gfx/transform.h"
 
 namespace cc {
 
 RenderSurfaceImpl::RenderSurfaceImpl(LayerImpl* owning_layer)
     : owning_layer_(owning_layer),
       layer_tree_impl_(owning_layer->layer_tree_impl()),
       stable_effect_id_(owning_layer->id()),
+      effect_tree_index_(EffectTree::kInvalidNodeId),
       surface_property_changed_(false),
       ancestor_property_changed_(false),
       contributes_to_drawn_surface_(false),
       nearest_occlusion_immune_ancestor_(nullptr),
       target_render_surface_layer_index_history_(0),
       current_layer_index_history_(0) {
   damage_tracker_ = DamageTracker::Create();
 }
 
 RenderSurfaceImpl::~RenderSurfaceImpl() {}
@@ skipping 104 matching lines @@
 
 int RenderSurfaceImpl::TransformTreeIndex() const {
   return owning_layer_->transform_tree_index();
 }
 
 int RenderSurfaceImpl::ClipTreeIndex() const {
   return owning_layer_->clip_tree_index();
 }
 
 int RenderSurfaceImpl::EffectTreeIndex() const {
-  return layer_tree_impl_->property_trees()
-      ->effect_id_to_index_map[stable_effect_id_];
+  DCHECK_EQ(effect_tree_index_,
+            layer_tree_impl_->property_trees()
+                ->effect_id_to_index_map[stable_effect_id_]);
+  return effect_tree_index_;
 }
 
 const EffectNode* RenderSurfaceImpl::OwningEffectNode() const {
   return layer_tree_impl_->property_trees()->effect_tree.Node(
       EffectTreeIndex());
 }
 
 void RenderSurfaceImpl::SetClipRect(const gfx::Rect& clip_rect) {
   if (clip_rect == draw_properties_.clip_rect)
     return;
@@ skipping 220 matching lines @@
 
   RenderPassDrawQuad* quad =
       render_pass->CreateAndAppendDrawQuad<RenderPassDrawQuad>();
   quad->SetNew(shared_quad_state, content_rect(), visible_layer_rect,
                GetRenderPassId(), mask_resource_id, mask_uv_scale,
                mask_texture_size, Filters(), owning_layer_to_target_scale,
                FiltersOrigin(), BackgroundFilters());
 }
 
 }  // namespace cc