Propagate supported scanout formats from driver to SurfaceFactoryOzone.

ui/ozone/platform/drm/gpu/drm_thread_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_THREAD_PROXY_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_DRM_THREAD_PROXY_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 15 matching lines @@
   scoped_refptr<DrmThreadMessageProxy> CreateDrmThreadMessageProxy();
 
   scoped_ptr<DrmWindowProxy> CreateDrmWindowProxy(
       gfx::AcceleratedWidget widget);
 
   scoped_refptr<GbmBuffer> CreateBuffer(gfx::AcceleratedWidget widget,
                                         const gfx::Size& size,
                                         gfx::BufferFormat format,
                                         gfx::BufferUsage usage);
 
+  void GetScanoutFormats(gfx::AcceleratedWidget widget,
+                         std::vector<gfx::BufferFormat>* scanout_formats);
+
  private:
   DrmThread drm_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(DrmThreadProxy);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_DRM_THREAD_PROXY_H_