Support external buffer import in VDA interface and add a V4L2SVDA impl.

content/renderer/media/rtc_video_decoder.h

 // Copyright 2013 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_RENDERER_MEDIA_RTC_VIDEO_DECODER_H_
 #define CONTENT_RENDERER_MEDIA_RTC_VIDEO_DECODER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 129 matching lines @@
   bool SaveToPendingBuffers_Locked(const webrtc::EncodedImage& input_image,
                                    const BufferData& buffer_data);
 
   // Gets SHM and moves pending buffers to decode buffers.
   void MovePendingBuffersToDecodeBuffers();
 
   scoped_refptr<media::VideoFrame> CreateVideoFrame(
       const media::Picture& picture,
       const media::PictureBuffer& pb,
       uint32_t timestamp,
-      const gfx::Rect& visible_rect);
+      const gfx::Rect& visible_rect,
+      media::VideoPixelFormat pixel_format);
 
   // Resets VDA.
   void ResetInternal();
 
   // Static method is to allow it to run even after RVD is deleted.
   static void ReleaseMailbox(base::WeakPtr<RTCVideoDecoder> decoder,
                              media::GpuVideoAcceleratorFactories* factories,
                              int64_t picture_buffer_id,
                              uint32_t texture_id,
                              const gpu::SyncToken& release_sync_token);
@@ skipping 134 matching lines @@
   // Must be destroyed, or invalidated, on |vda_loop_proxy_|
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<RTCVideoDecoder> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RTCVideoDecoder);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_RTC_VIDEO_DECODER_H_