Ozone: Avoid blocking in Swapbuffer Call.

ui/ozone/platform/dri/gbm_surface_factory.h

Index: ui/ozone/platform/dri/gbm_surface_factory.h
diff --git a/ui/ozone/platform/dri/gbm_surface_factory.h b/ui/ozone/platform/dri/gbm_surface_factory.h
index 05ac0f9f01fa7aa301568bc444257660e17f56c5..177dccc5c91f33480e035e971a931f3e3d67c0a6 100644
--- a/ui/ozone/platform/dri/gbm_surface_factory.h
+++ b/ui/ozone/platform/dri/gbm_surface_factory.h
@@ -13,6 +13,7 @@ namespace ui {
 
 class DriWindowDelegate;
 class DriWindowDelegateManager;
+class PageFilpEventHandler;
 class ScreenManager;
 
 class GbmSurfaceFactory : public DriSurfaceFactory {
@@ -56,6 +57,7 @@ class GbmSurfaceFactory : public DriSurfaceFactory {
 
   ScreenManager* screen_manager_;  // Not owned.
   gbm_device* device_;  // Not owned.
+  scoped_ptr<PageFilpEventHandler> flip_handler_;
   bool allow_surfaceless_;
 
   DISALLOW_COPY_AND_ASSIGN(GbmSurfaceFactory);