Use UI message loop for in process GPU thread on Windows

content/browser/gpu/gpu_process_host.cc

Index: content/browser/gpu/gpu_process_host.cc
diff --git a/content/browser/gpu/gpu_process_host.cc b/content/browser/gpu/gpu_process_host.cc
index 35019673a3cdb2b3b90ccdba66e1295826b81e99..bb8aaa8ad530effc38e8bc7703d6770090a8831a 100644
--- a/content/browser/gpu/gpu_process_host.cc
+++ b/content/browser/gpu/gpu_process_host.cc
@@ -512,7 +512,12 @@ bool GpuProcessHost::Init() {
     gpu_data_manager->AppendGpuCommandLine(command_line);
 
     in_process_gpu_thread_.reset(g_gpu_main_thread_factory(channel_id));
-    in_process_gpu_thread_->Start();
+    base::Thread::Options options;
+#if defined(OS_WIN)
+    // WGL needs to create its own window and pump messages on it.
+    options.message_loop_type = base::MessageLoop::TYPE_UI;

[Ken Russell (switch to Gerrit), 2014/10/11 03:04:32]

Is there any benefit to checking if --use-gl=desktop was passed, and only
setting this option if so?

+#endif
+    in_process_gpu_thread_->StartWithOptions(options);
 
     OnProcessLaunched();  // Fake a callback that the process is ready.
   } else if (!LaunchGpuProcess(channel_id)) {