Adding status to swap complete

ui/ozone/platform/drm/gpu/hardware_display_controller.h

Index: ui/ozone/platform/drm/gpu/hardware_display_controller.h
diff --git a/ui/ozone/platform/drm/gpu/hardware_display_controller.h b/ui/ozone/platform/drm/gpu/hardware_display_controller.h
index 52095d5ef5641a39d434e847d1872be660a2fbeb..7547c3729cedbcc5a673ef5216605f2670eef9eb 100644
--- a/ui/ozone/platform/drm/gpu/hardware_display_controller.h
+++ b/ui/ozone/platform/drm/gpu/hardware_display_controller.h
@@ -90,6 +90,8 @@ class DrmDevice;
 class OZONE_EXPORT HardwareDisplayController
     : public base::SupportsWeakPtr<HardwareDisplayController>,
       public PageFlipObserver {
+  typedef base::Callback<void(int)> PageFlipCallback;
+
  public:
   explicit HardwareDisplayController(scoped_ptr<CrtcController> controller);
   ~HardwareDisplayController() override;
@@ -122,7 +124,8 @@ class OZONE_EXPORT HardwareDisplayController
   // called again before the page flip occurrs.
   //
   // Returns true if the page flip was successfully registered, false otherwise.
-  bool SchedulePageFlip(bool is_sync, const base::Closure& callback);
+  bool SchedulePageFlip(bool is_sync, const PageFlipCallback& callback);
+  bool SchedulePageFlipWithoutCallback(bool is_sync);
 
   // Set the hardware cursor to show the contents of |surface|.
   bool SetCursor(const scoped_refptr<ScanoutBuffer>& buffer);
@@ -169,12 +172,12 @@ class OZONE_EXPORT HardwareDisplayController
   struct PageFlipRequest {
     PageFlipRequest(const OverlayPlaneList& planes,
                     bool is_sync,
-                    const base::Closure& callback);
+                    const PageFlipCallback& callback);
     ~PageFlipRequest();
 
     OverlayPlaneList planes;
     bool is_sync;
-    base::Closure callback;
+    PageFlipCallback callback;
   };
 
   // Buffers need to be declared first so that they are destroyed last. Needed