Revert of Flip flag to turn CrOS Browser Compositor Single Threaded

content/browser/compositor/gpu_process_transport_factory.cc

Index: content/browser/compositor/gpu_process_transport_factory.cc
diff --git a/content/browser/compositor/gpu_process_transport_factory.cc b/content/browser/compositor/gpu_process_transport_factory.cc
index d9ba0b55aeebf2c630872f1c55bb3d87d0dde745..c7c867e6001ea62b0ae91752c2b9e3171a601b98 100644
--- a/content/browser/compositor/gpu_process_transport_factory.cc
+++ b/content/browser/compositor/gpu_process_transport_factory.cc
@@ -74,7 +74,16 @@
       callback_factory_(this) {
   output_surface_proxy_ = new BrowserCompositorOutputSurfaceProxy(
       &output_surface_map_);
-
+#if defined(OS_CHROMEOS)
+  bool use_thread = !base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kUIDisableThreadedCompositing);
+#else
+  bool use_thread = false;
+#endif
+  if (use_thread) {
+    compositor_thread_.reset(new base::Thread("Browser Compositor"));
+    compositor_thread_->Start();
+  }
   if (UseSurfacesEnabled())
     surface_manager_ = make_scoped_ptr(new cc::SurfaceManager);
 }
@@ -238,7 +247,7 @@
   if (!context_provider.get()) {
     if (compositor_thread_.get()) {
       LOG(FATAL) << "Failed to create UI context, but can't use software"
-                    " compositing with browser threaded compositing. Aborting.";
+                 " compositing with browser threaded compositing. Aborting.";
     }
 
     scoped_ptr<SoftwareBrowserCompositorOutputSurface> surface(