cc: Clean up root_layer code in LTI

cc/trees/layer_tree_host_common_perftest.cc

 // Copyright 2013 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 <stddef.h>
 
 #include <deque>
 #include <memory>
 #include <sstream>
 
@@ skipping 90 matching lines @@
 
     EndTest();
   }
 
   void DoCalcDrawPropertiesImpl(bool can_render_to_separate_surface,
                                 int max_texture_size,
                                 LayerTreeImpl* active_tree,
                                 LayerTreeHostImpl* host_impl) {
     LayerImplList update_list;
     LayerTreeHostCommon::CalcDrawPropsImplInputs inputs(
-        active_tree->root_layer(), active_tree->DrawViewportSize(),
+        active_tree->root_layer_for_testing(), active_tree->DrawViewportSize(),
         host_impl->DrawTransform(), active_tree->device_scale_factor(),
         active_tree->current_page_scale_factor(),
         active_tree->InnerViewportContainerLayer(),
         active_tree->InnerViewportScrollLayer(),
         active_tree->OuterViewportScrollLayer(),
         active_tree->elastic_overscroll()->Current(active_tree->IsActiveTree()),
         active_tree->OverscrollElasticityLayer(), max_texture_size,
         can_render_to_separate_surface,
         host_impl->settings().layer_transforms_should_scale_layer_contents,
         false,  // do not verify_clip_tree_calculation for perf tests
@@ skipping 18 matching lines @@
     // First build the tree and then we'll start running tests on layersorter
     // itself
     bool can_render_to_separate_surface = true;
     int max_texture_size = 8096;
     DoCalcDrawPropertiesImpl(can_render_to_separate_surface,
                              max_texture_size,
                              active_tree,
                              host_impl);
 
     LayerImplList base_list;
-    BuildLayerImplList(active_tree->root_layer(), &base_list);
+    BuildLayerImplList(active_tree->root_layer_for_testing(), &base_list);
 
     int polygon_counter = 0;
     std::vector<std::unique_ptr<DrawPolygon>> polygon_list;
     for (LayerImplList::iterator it = base_list.begin(); it != base_list.end();
          ++it) {
       DrawPolygon* draw_polygon = new DrawPolygon(
           NULL, gfx::RectF(gfx::SizeF((*it)->bounds())),
           (*it)->draw_properties().target_space_transform, polygon_counter++);
       polygon_list.push_back(std::unique_ptr<DrawPolygon>(draw_polygon));
     }
@@ skipping 85 matching lines @@
 
 TEST_F(BspTreePerfTest, BspTreeCubes_4) {
   SetTestName("bsp_tree_cubes_4");
   SetNumberOfDuplicates(4);
   ReadTestFile("layer_sort_cubes");
   RunSortLayers();
 }
 
 }  // namespace
 }  // namespace cc