cc: Clean up root_layer code in LTI

cc/trees/damage_tracker_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/damage_tracker.h"
 
 #include <stddef.h>
 
 #include "cc/base/math_util.h"
 #include "cc/layers/layer_impl.h"
@@ skipping 80 matching lines @@
 
     root->SetPosition(gfx::PointF());
     root->SetBounds(gfx::Size(500, 500));
     root->SetDrawsContent(true);
     root->test_properties()->force_render_surface = true;
 
     child->SetPosition(gfx::PointF(100.f, 100.f));
     child->SetBounds(gfx::Size(30, 30));
     child->SetDrawsContent(true);
     root->test_properties()->AddChild(std::move(child));
-    host_impl_.active_tree()->SetRootLayer(std::move(root));
+    host_impl_.active_tree()->SetRootLayerForTesting(std::move(root));
 
-    return host_impl_.active_tree()->root_layer();
+    return host_impl_.active_tree()->root_layer_for_testing();
   }
 
   LayerImpl* CreateTestTreeWithTwoSurfaces() {
     // This test tree has two render surfaces: one for the root, and one for
     // child1. Additionally, the root has a second child layer, and child1 has
     // two children of its own.
 
     host_impl_.active_tree()->DetachLayers();
     std::unique_ptr<LayerImpl> root =
         LayerImpl::Create(host_impl_.active_tree(), 1);
@@ skipping 28 matching lines @@
     grand_child1->SetDrawsContent(true);
 
     grand_child2->SetPosition(gfx::PointF(190.f, 190.f));
     grand_child2->SetBounds(gfx::Size(6, 8));
     grand_child2->SetDrawsContent(true);
 
     child1->test_properties()->AddChild(std::move(grand_child1));
     child1->test_properties()->AddChild(std::move(grand_child2));
     root->test_properties()->AddChild(std::move(child1));
     root->test_properties()->AddChild(std::move(child2));
-    host_impl_.active_tree()->SetRootLayer(std::move(root));
+    host_impl_.active_tree()->SetRootLayerForTesting(std::move(root));
 
-    return host_impl_.active_tree()->root_layer();
+    return host_impl_.active_tree()->root_layer_for_testing();
   }
 
   LayerImpl* CreateAndSetUpTestTreeWithOneSurface() {
     LayerImpl* root = CreateTestTreeWithOneSurface();
 
     // Setup includes going past the first frame which always damages
     // everything, so that we can actually perform specific tests.
     root->layer_tree_impl()->property_trees()->needs_rebuild = true;
     EmulateDrawingOneFrame(root);
 
@@ skipping 1380 matching lines @@
   EXPECT_EQ(gfx::Rect(30, 31, 14, 15).ToString(), root_damage_rect.ToString());
 }
 
 TEST_F(DamageTrackerTest, VerifyDamageForEmptyLayerList) {
   // Though it should never happen, its a good idea to verify that the damage
   // tracker does not crash when it receives an empty layer_list.
 
   std::unique_ptr<LayerImpl> root =
       LayerImpl::Create(host_impl_.active_tree(), 1);
   root->test_properties()->force_render_surface = true;
-  host_impl_.active_tree()->SetRootLayer(std::move(root));
-  LayerImpl* root_ptr = host_impl_.active_tree()->root_layer();
+  host_impl_.active_tree()->SetRootLayerForTesting(std::move(root));
+  LayerImpl* root_ptr = host_impl_.active_tree()->root_layer_for_testing();
   root_ptr->layer_tree_impl()->property_trees()->needs_rebuild = true;
   EmulateDrawingOneFrame(root_ptr);
 
   DCHECK_EQ(root_ptr->render_surface(), root_ptr->render_target());
   RenderSurfaceImpl* target_surface = root_ptr->render_surface();
 
   LayerImplList empty_list;
   target_surface->damage_tracker()->UpdateDamageTrackingState(
       empty_list, target_surface, false, gfx::Rect(), NULL, FilterOperations());
 
@@ skipping 71 matching lines @@
     gfx::Rect root_damage_rect =
         root->render_surface()->damage_tracker()->current_damage_rect();
     gfx::Rect damage_we_care_about = gfx::Rect(i, i);
     EXPECT_LE(damage_we_care_about.right(), root_damage_rect.right());
     EXPECT_LE(damage_we_care_about.bottom(), root_damage_rect.bottom());
   }
 }
 
 }  // namespace
 }  // namespace cc