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

ui/ozone/platform/drm/gpu/overlay_plane.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_DRM_GPU_OVERLAY_PLANE_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_OVERLAY_PLANE_H_
 
 #include <vector>
 
+#include "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/overlay_transform.h"
 #include "ui/ozone/ozone_export.h"
 
 namespace ui {
 
 class ScanoutBuffer;
 
 struct OverlayPlane;
 typedef std::vector<OverlayPlane> OverlayPlaneList;
 
 struct OZONE_EXPORT OverlayPlane {
   // Simpler constructor for the primary plane.
   explicit OverlayPlane(const scoped_refptr<ScanoutBuffer>& buffer);
 
   OverlayPlane(const scoped_refptr<ScanoutBuffer>& buffer,
                int z_order,
                gfx::OverlayTransform plane_transform,
                const gfx::Rect& display_bounds,
                const gfx::RectF& crop_rect);
 
+  // This represents a callback function which can copy |source_buffer| to
+  // |target_buffer| and while doing so handle any post-processing operations
+  // like scaling and color space conversion.
+  typedef base::Callback<bool(const scoped_refptr<ScanoutBuffer>& source_buffer,
+                              scoped_refptr<ScanoutBuffer>& target_buffer)>
+      CopyBufferCallback;
+  OverlayPlane(const scoped_refptr<ScanoutBuffer>& buffer,
+               int z_order,
+               gfx::OverlayTransform plane_transform,
+               const gfx::Rect& display_bounds,
+               const gfx::RectF& crop_rect,
+               const CopyBufferCallback& processing_callback);
+
   bool operator<(const OverlayPlane& plane) const;
 
   ~OverlayPlane();
 
   // Returns the primary plane in |overlays|.
   static const OverlayPlane* GetPrimaryPlane(const OverlayPlaneList& overlays);
 
   scoped_refptr<ScanoutBuffer> buffer;
   int z_order = 0;
   gfx::OverlayTransform plane_transform;
   gfx::Rect display_bounds;
   gfx::RectF crop_rect;
+  CopyBufferCallback processing_callback;
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_OVERLAY_PLANE_H_