cc : Update render surfaces using LayerListIterator instead of treewalk

cc/test/layer_test_common.cc

 // Copyright 2012 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/test/layer_test_common.h"
 
 #include <stddef.h>
 
 #include "cc/animation/animation_host.h"
 #include "cc/animation/animation_id_provider.h"
@@ skipping 105 matching lines @@
   }
 }
 
 LayerTestCommon::LayerImplTest::LayerImplTest()
     : LayerImplTest(LayerTreeSettings()) {}
 
 LayerTestCommon::LayerImplTest::LayerImplTest(const LayerTreeSettings& settings)
     : client_(FakeLayerTreeHostClient::DIRECT_3D),
       output_surface_(FakeOutputSurface::Create3d()),
       host_(FakeLayerTreeHost::Create(&client_, &task_graph_runner_, settings)),
-      root_layer_impl_(LayerImpl::Create(host_->host_impl()->active_tree(), 1)),
       render_pass_(RenderPass::Create()),
       layer_impl_id_(2) {
-  root_layer_impl_->SetHasRenderSurface(true);
+  scoped_ptr<LayerImpl> root_layer_impl =
+      LayerImpl::Create(host_->host_impl()->active_tree(), 1);
+  root_layer_impl->SetHasRenderSurface(true);
+  host_->host_impl()->active_tree()->SetRootLayer(std::move(root_layer_impl));
   host_->host_impl()->SetVisible(true);
   host_->host_impl()->InitializeRenderer(output_surface_.get());
 
   const int timeline_id = AnimationIdProvider::NextTimelineId();
   timeline_ = AnimationTimeline::Create(timeline_id);
   host_->animation_host()->AddAnimationTimeline(timeline_);
   // Create impl-side instance.
   host_->animation_host()->PushPropertiesTo(
       host_->host_impl()->animation_host());
   timeline_impl_ =
       host_->host_impl()->animation_host()->GetTimelineById(timeline_id);
 }
 
 LayerTestCommon::LayerImplTest::~LayerImplTest() {
   host_->animation_host()->RemoveAnimationTimeline(timeline_);
   timeline_ = nullptr;
 }
 
 void LayerTestCommon::LayerImplTest::CalcDrawProps(
     const gfx::Size& viewport_size) {
   LayerImplList layer_list;
   host_->host_impl()->active_tree()->IncrementRenderSurfaceListIdForTesting();
   LayerTreeHostCommon::CalcDrawPropsImplInputsForTesting inputs(
-      root_layer_impl_.get(), viewport_size, &layer_list,
+      host_->host_impl()->active_tree()->root_layer(), viewport_size,
+      &layer_list,
       host_->host_impl()->active_tree()->current_render_surface_list_id());
   LayerTreeHostCommon::CalculateDrawProperties(&inputs);
 }
 
 void LayerTestCommon::LayerImplTest::AppendQuadsWithOcclusion(
     LayerImpl* layer_impl,
     const gfx::Rect& occluded) {
   AppendQuadsData data;
 
   render_pass_->quad_list.clear();
@@ skipping 40 matching lines @@
                 SimpleEnclosedRegion()),
       SK_ColorBLACK, 1.f, nullptr, &data, RenderPassId(1, 1));
 }
 
 void EmptyCopyOutputCallback(scoped_ptr<CopyOutputResult> result) {}
 
 void LayerTestCommon::LayerImplTest::RequestCopyOfOutput() {
   std::vector<scoped_ptr<CopyOutputRequest>> copy_requests;
   copy_requests.push_back(
       CopyOutputRequest::CreateRequest(base::Bind(&EmptyCopyOutputCallback)));
-  root_layer_impl_->PassCopyRequests(&copy_requests);
+  host_->host_impl()->active_tree()->root_layer()->PassCopyRequests(
+      &copy_requests);
 }
 
 }  // namespace cc