Extract bitrate allocation of spatial/temporal layers out of codec impl.

webrtc/modules/video_coding/include/video_coding.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 17 matching lines @@
 #include "webrtc/video_frame.h"
 
 namespace webrtc {
 
 class Clock;
 class EncodedImageCallback;
 // TODO(pbos): Remove VCMQMSettingsCallback completely. This might be done by
 // removing the VCM and use VideoSender/VideoReceiver as a public interface
 // directly.
 class VCMQMSettingsCallback;
+class VideoBitrateAllocator;
 class VideoEncoder;
 class VideoDecoder;
 struct CodecSpecificInfo;
 
 class EventFactory {
  public:
   virtual ~EventFactory() {}
 
   virtual EventWrapper* CreateEvent() = 0;
 };
@@ skipping 420 matching lines @@
 
   virtual void RegisterPostEncodeImageCallback(
       EncodedImageCallback* post_encode_callback) = 0;
   // Releases pending decode calls, permitting faster thread shutdown.
   virtual void TriggerDecoderShutdown() = 0;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_INCLUDE_VIDEO_CODING_H_