[ozone] Keep the queue of surfaceless buffers inside gl_surface_ozone

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

Index: ui/ozone/platform/drm/gpu/crtc_controller.h
diff --git a/ui/ozone/platform/drm/gpu/crtc_controller.h b/ui/ozone/platform/drm/gpu/crtc_controller.h
index 4404bfa25d9b24d9c0e8f070ba07caafebc5b2d7..f18e6cb624923ede51d98421a1df9d1027ed349b 100644
--- a/ui/ozone/platform/drm/gpu/crtc_controller.h
+++ b/ui/ozone/platform/drm/gpu/crtc_controller.h
@@ -19,7 +19,7 @@
 namespace ui {
 
 class DrmDevice;
-class PageFlipObserver;
+class PageFlipRequest;
 
 // Wrapper around a CRTC.
 //
@@ -52,7 +52,8 @@ class OZONE_EXPORT CrtcController
 
   // Schedule a page flip event and present the overlays in |planes|.
   bool SchedulePageFlip(HardwareDisplayPlaneList* plane_list,
-                        const OverlayPlaneList& planes);
+                        const OverlayPlaneList& planes,
+                        scoped_refptr<PageFlipRequest> page_flip_request);
 
   // Called if the page flip for this CRTC fails after being scheduled.
   void PageFlipFailed();
@@ -70,9 +71,6 @@ class OZONE_EXPORT CrtcController
   bool SetCursor(const scoped_refptr<ScanoutBuffer>& buffer);
   bool MoveCursor(const gfx::Point& location);
 
-  void AddObserver(PageFlipObserver* observer);
-  void RemoveObserver(PageFlipObserver* observer);
-
  private:
   bool ResetCursor();
 
@@ -85,6 +83,7 @@ class OZONE_EXPORT CrtcController
   OverlayPlaneList current_planes_;
   OverlayPlaneList pending_planes_;
   scoped_refptr<ScanoutBuffer> cursor_buffer_;
+  scoped_refptr<PageFlipRequest> page_flip_request_;
 
   uint32_t crtc_;
 
@@ -108,8 +107,6 @@ class OZONE_EXPORT CrtcController
   // The time of the last page flip event as reported by the kernel callback.
   uint64_t time_of_last_flip_;
 
-  ObserverList<PageFlipObserver> observers_;
-
   DISALLOW_COPY_AND_ASSIGN(CrtcController);
 };