Introduce separate client and init path for single-threaded cc

content/test/web_layer_tree_view_impl_for_testing.cc

Index: content/test/web_layer_tree_view_impl_for_testing.cc
diff --git a/content/test/web_layer_tree_view_impl_for_testing.cc b/content/test/web_layer_tree_view_impl_for_testing.cc
index 64be748b3f7de9a725a99b84ff8ebebf2eb8736d..7858fd8c8bb7eeecdf763c6a9e4882d3fd5359f5 100644
--- a/content/test/web_layer_tree_view_impl_for_testing.cc
+++ b/content/test/web_layer_tree_view_impl_for_testing.cc
@@ -45,7 +45,8 @@ bool WebLayerTreeViewImplForTesting::Initialize() {
 
   // 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;
@@ -162,9 +163,6 @@ WebLayerTreeViewImplForTesting::CreateOutputSurface(bool fallback) {
       new cc::OutputSurface(cc::TestContextProvider::Create()));
 }
 
-void WebLayerTreeViewImplForTesting::ScheduleComposite() {
-}
-
 scoped_refptr<cc::ContextProvider>
 WebLayerTreeViewImplForTesting::OffscreenContextProvider() {
   // Unit tests only run in single threaded mode.