Ozone: Avoid blocking in Swapbuffer Call.

ui/ozone/platform/dri/gbm_surface_factory.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_OZONE_PLATFORM_DRI_GBM_SURFACE_FACTORY_H_
 #define UI_OZONE_PLATFORM_DRI_GBM_SURFACE_FACTORY_H_
 
 #include "ui/ozone/platform/dri/dri_surface_factory.h"
 
 struct gbm_device;
 
 namespace ui {
 
 class DriWindowDelegate;
 class DriWindowDelegateManager;
+class PageFlipEventHandler;
 class ScreenManager;
 
 class GbmSurfaceFactory : public DriSurfaceFactory {
  public:
   GbmSurfaceFactory(bool allow_surfaceless);
   ~GbmSurfaceFactory() override;
 
   void InitializeGpu(DriWrapper* dri,
                      gbm_device* device,
                      ScreenManager* screen_manager,
@@ skipping 23 matching lines @@
                             const gfx::Rect& display_bounds,
                             const gfx::RectF& crop_rect) override;
   bool CanShowPrimaryPlaneAsOverlay() override;
   bool CanCreateNativePixmap(BufferUsage usage) override;
 
  private:
   DriWindowDelegate* GetOrCreateWindowDelegate(gfx::AcceleratedWidget widget);
 
   ScreenManager* screen_manager_;  // Not owned.
   gbm_device* device_;  // Not owned.
+  scoped_ptr<PageFlipEventHandler> flip_handler_;
   bool allow_surfaceless_;
 
   DISALLOW_COPY_AND_ASSIGN(GbmSurfaceFactory);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_GBM_SURFACE_FACTORY_H_