V4L2SVDA/VAAPIVDA: use visible size from decoder and pass to client

media/gpu/vp8_picture.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 MEDIA_GPU_VP8_PICTURE_H_
 #define MEDIA_GPU_VP8_PICTURE_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "ui/gfx/geometry/rect.h"
 
 namespace media {
 
 class V4L2VP8Picture;
 class VaapiVP8Picture;
 
 class VP8Picture : public base::RefCounted<VP8Picture> {
  public:
   VP8Picture();
 
   virtual V4L2VP8Picture* AsV4L2VP8Picture();
   virtual VaapiVP8Picture* AsVaapiVP8Picture();
 
+  // The visible size of picture.
+  gfx::Rect visible_rect;
+
  protected:
   friend class base::RefCounted<VP8Picture>;
   virtual ~VP8Picture();
 
   DISALLOW_COPY_AND_ASSIGN(VP8Picture);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_GPU_VP8_PICTURE_H_