Introduce separate client and init path for single-threaded cc

content/browser/renderer_host/compositor_impl_android.cc

Index: content/browser/renderer_host/compositor_impl_android.cc
diff --git a/content/browser/renderer_host/compositor_impl_android.cc b/content/browser/renderer_host/compositor_impl_android.cc
index 8550172bc83a4a6e50cb54232cea09abef73e9eb..738c1271183727e7de780e1b1fdc87ffeaf1d5da 100644
--- a/content/browser/renderer_host/compositor_impl_android.cc
+++ b/content/browser/renderer_host/compositor_impl_android.cc
@@ -91,7 +91,6 @@ class OutputSurfaceWithoutParent : public cc::OutputSurface {
 };
 
 static bool g_initialized = false;
-static base::Thread* g_impl_thread = NULL;
 
 } // anonymous namespace
 
@@ -120,11 +119,6 @@ bool CompositorImpl::IsInitialized() {
 }
 
 // static
-bool CompositorImpl::IsThreadingEnabled() {
-  return g_impl_thread;
-}
-
-// static
 jobject CompositorImpl::GetSurface(int surface_id) {
   base::AutoLock lock(g_surface_map_lock.Get());
   SurfaceMap* surfaces = g_surface_map.Pointer();
@@ -226,12 +220,7 @@ void CompositorImpl::SetVisible(bool visible) {
     settings.use_memory_management = false;
     settings.highp_threshold_min = 2048;
 
-    scoped_refptr<base::SingleThreadTaskRunner> impl_thread_task_runner =
-        g_impl_thread ? g_impl_thread->message_loop()->message_loop_proxy()
-                      : NULL;
-
-    host_ = cc::LayerTreeHost::Create(
-        this, NULL, settings, impl_thread_task_runner);
+    host_ = cc::LayerTreeHost::CreateSingleThreaded(this, this, NULL, settings);
     host_->SetRootLayer(root_layer_);
 
     host_->SetVisible(true);