Ozone: Dont hardcode format to YUV when using Overlay Composition.

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

 // Copyright 2015 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_DRM_GPU_DRM_WINDOW_PROXY_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_DRM_WINDOW_PROXY_H_
 
 #include <vector>
 
 #include "ui/gfx/native_widget_types.h"
@@ skipping 11 matching lines @@
   ~DrmWindowProxy();
 
   gfx::AcceleratedWidget widget() const { return widget_; }
 
   void SchedulePageFlip(const std::vector<OverlayPlane>& planes,
                         const SwapCompletionCallback& callback);
 
   void GetVSyncParameters(
       const gfx::VSyncProvider::UpdateVSyncCallback& callback);
 
+  void GetOverlayBufferConfigurations(const OverlayParamCallback& callback);
+
  private:
   gfx::AcceleratedWidget widget_;
 
   DrmThread* drm_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(DrmWindowProxy);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_DRM_WINDOW_PROXY_H_