Fix the MessageLoop type in case more than one ozone platform is built

ui/ozone/platform/x11/ozone_platform_x11.cc

Index: ui/ozone/platform/x11/ozone_platform_x11.cc
diff --git a/ui/ozone/platform/x11/ozone_platform_x11.cc b/ui/ozone/platform/x11/ozone_platform_x11.cc
index 6db5b67b1b99ea898677884c378241b7311c4086..e3e085563c8bb2be303194d5aa88be1e808634e4 100644
--- a/ui/ozone/platform/x11/ozone_platform_x11.cc
+++ b/ui/ozone/platform/x11/ozone_platform_x11.cc
@@ -104,6 +104,12 @@ class OzonePlatformX11 : public OzonePlatform {
     surface_factory_ozone_.reset(new X11SurfaceFactory());
   }
 
+  base::MessageLoop::Type GetMessageLoopTypeForGpu() override {
+    // If we are be running Ozone X11 we need a UI loop to grab Expose events.
+    // See GLSurfaceGLX and https://crbug.com/326995.

[fwang, 2017/02/07 17:03:46]

"we are running"

grab or Expose?

+    return base::MessageLoop::TYPE_UI;
+  }
+
  private:
   // Objects in the browser process.
   std::unique_ptr<X11WindowManagerOzone> window_manager_;