Add accelerated video decoder interface, VP8 and H.264 implementations and hook up to V4L2SVDA.

content/common/gpu/media/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 CONTENT_COMMON_GPU_MEDIA_VP8_PICTURE_H_
+#define CONTENT_COMMON_GPU_MEDIA_VP8_PICTURE_H_
+
+#include "base/memory/ref_counted.h"
+
+namespace content {
+
+class V4L2VP8Picture;
+
+class VP8Picture : public base::RefCounted<VP8Picture> {
+ public:
+  VP8Picture();
+
+  virtual V4L2VP8Picture* AsV4L2VP8Picture() { return nullptr; }
+
+ protected:
+  friend class base::RefCounted<VP8Picture>;
+  virtual ~VP8Picture();
+
+  DISALLOW_COPY_AND_ASSIGN(VP8Picture);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GPU_MEDIA_VP8_PICTURE_H_