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 c7c867e6001ea62b0ae91752c2b9e3171a601b98..a7a4a5721f48442889df58bdb50a21e185e12ec8 100644
--- a/content/browser/compositor/gpu_process_transport_factory.cc
+++ b/content/browser/compositor/gpu_process_transport_factory.cc
@@ -74,16 +74,7 @@ GpuProcessTransportFactory::GpuProcessTransportFactory()
       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);
 }
@@ -245,10 +236,10 @@ void GpuProcessTransportFactory::EstablishedGpuChannel(
   }
 
   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.";
-    }
+#if defined(OS_CHROMEOS)

[piman, 2015/01/29 23:56:25]

Actually, it looks like browser_tests on linux_chromeos run without the thread
and in software.
Leave this part as is then? (or remove LOG?)

[weiliangc, 2015/01/30 00:00:52]

Leaving it as it is now.

+    LOG(FATAL) << "Failed to create UI context, but can't use software"
+                  " compositing with browser threaded compositing. Aborting.";
+#endif
 
     scoped_ptr<SoftwareBrowserCompositorOutputSurface> surface(
         new SoftwareBrowserCompositorOutputSurface(