Clarify property tree id-to-index map names.

cc/trees/layer_tree_host_common_unittest.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/trees/layer_tree_host_common.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 10246 matching lines @@
   child->SetBounds(gfx::Size(20, 20));
   ExecuteCalculateDrawPropertiesAndSaveUpdateLayerList(root.get());
 
   // Changing the opacity from 1 to non-1 value should trigger rebuild of
   // property trees as a new effect node will be created.
   child->SetOpacity(0.5f);
   PropertyTrees* property_trees = host()->property_trees();
   EXPECT_TRUE(property_trees->needs_rebuild);
 
   ExecuteCalculateDrawPropertiesAndSaveUpdateLayerList(root.get());
-  EXPECT_NE(property_trees->effect_id_to_index_map.find(child->id()),
-            property_trees->effect_id_to_index_map.end());
+  EXPECT_NE(property_trees->layer_id_to_effect_node_index.find(child->id()),
+            property_trees->layer_id_to_effect_node_index.end());
 
   // child already has an effect node. Changing its opacity shouldn't trigger
   // a property trees rebuild.
   child->SetOpacity(0.8f);
   property_trees = host()->property_trees();
   EXPECT_FALSE(property_trees->needs_rebuild);
 
   ExecuteCalculateDrawPropertiesAndSaveUpdateLayerList(root.get());
-  EXPECT_NE(property_trees->effect_id_to_index_map.find(child->id()),
-            property_trees->effect_id_to_index_map.end());
+  EXPECT_NE(property_trees->layer_id_to_effect_node_index.find(child->id()),
+            property_trees->layer_id_to_effect_node_index.end());
 
   // Changing the opacity from non-1 value to 1 should trigger a rebuild of
   // property trees as the effect node may no longer be needed.
   child->SetOpacity(1.f);
   property_trees = host()->property_trees();
   EXPECT_TRUE(property_trees->needs_rebuild);
 
   ExecuteCalculateDrawPropertiesAndSaveUpdateLayerList(root.get());
-  EXPECT_EQ(property_trees->effect_id_to_index_map.find(child->id()),
-            property_trees->effect_id_to_index_map.end());
+  EXPECT_EQ(property_trees->layer_id_to_effect_node_index.find(child->id()),
+            property_trees->layer_id_to_effect_node_index.end());
 }
 
 TEST_F(LayerTreeHostCommonTest, OpacityAnimationsTrackingTest) {
   scoped_refptr<Layer> root = Layer::Create();
   scoped_refptr<LayerWithForcedDrawsContent> animated =
       make_scoped_refptr(new LayerWithForcedDrawsContent());
   root->AddChild(animated);
   host()->SetRootLayer(root);
   host()->GetLayerTree()->SetElementIdsForTesting();
 
@@ skipping 284 matching lines @@
   EXPECT_EQ(scroll_child6.id, grand_child10->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, parent3->scroll_tree_index());
   EXPECT_EQ(scroll_child7.id, child8->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, parent4->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, child9->scroll_tree_index());
   EXPECT_EQ(scroll_root1.id, grand_child12->scroll_tree_index());
 }
 
 }  // namespace
 }  // namespace cc