Introduce separate client and init path for single-threaded cc

content/test/web_layer_tree_view_impl_for_testing.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 "content/test/web_layer_tree_view_impl_for_testing.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/synchronization/lock.h"
 #include "cc/base/switches.h"
@@ skipping 27 matching lines @@
 
 bool WebLayerTreeViewImplForTesting::Initialize() {
   cc::LayerTreeSettings settings;
 
   // For web contents, layer transforms should scale up the contents of layers
   // to keep content always crisp when possible.
   settings.layer_transforms_should_scale_layer_contents = true;
 
   // Accelerated animations are enabled for unit tests.
   settings.accelerated_animation_enabled = true;
-  layer_tree_host_ = cc::LayerTreeHost::Create(this, NULL, settings, NULL);
+  layer_tree_host_ =
+      cc::LayerTreeHost::CreateSingleThreaded(this, this, NULL, settings);
   if (!layer_tree_host_)
     return false;
   return true;
 }
 
 void WebLayerTreeViewImplForTesting::setSurfaceReady() {
   layer_tree_host_->SetLayerTreeHostClientReady();
 }
 
 void WebLayerTreeViewImplForTesting::setRootLayer(
@@ skipping 96 matching lines @@
 void WebLayerTreeViewImplForTesting::ApplyScrollAndScale(
     gfx::Vector2d scroll_delta,
     float page_scale) {}
 
 scoped_ptr<cc::OutputSurface>
 WebLayerTreeViewImplForTesting::CreateOutputSurface(bool fallback) {
   return make_scoped_ptr(
       new cc::OutputSurface(cc::TestContextProvider::Create()));
 }
 
-void WebLayerTreeViewImplForTesting::ScheduleComposite() {
-}
-
 scoped_refptr<cc::ContextProvider>
 WebLayerTreeViewImplForTesting::OffscreenContextProvider() {
   // Unit tests only run in single threaded mode.
   return webkit::gpu::TestContextProviderFactory::GetInstance()->
       OffscreenContextProviderForMainThread();
 }
 
 }  // namespace webkit