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

ui/ozone/public/ozone_platform.h

Index: ui/ozone/public/ozone_platform.h
diff --git a/ui/ozone/public/ozone_platform.h b/ui/ozone/public/ozone_platform.h
index 236924f01591b3a53d0c52d6959e7854c9f8483f..8bb80d6e2ae1e188f98527fe0fcb0e4e36459171 100644
--- a/ui/ozone/public/ozone_platform.h
+++ b/ui/ozone/public/ozone_platform.h
@@ -8,6 +8,7 @@
 #include <memory>
 
 #include "base/macros.h"
+#include "base/message_loop/message_loop.h"
 #include "ui/ozone/ozone_export.h"
 
 namespace display {
@@ -92,6 +93,8 @@ class OZONE_EXPORT OzonePlatform {
 
   static OzonePlatform* GetInstance();
 
+  static base::MessageLoop::Type GetMessageLoopType();

[kylechar, 2017/01/17 21:54:53]

Add a comment to why this is here.

+
   // Factory getters to override in subclasses. The returned objects will be
   // injected into the appropriate layer at startup. Subclasses should not
   // inject these objects themselves. Ownership is retained by OzonePlatform.