[Cast] Repurpose CastInitializationStatus for variable frame size support.

media/cast/sender/h264_vt_encoder.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 MEDIA_CAST_SENDER_H264_VT_ENCODER_H_
 #define MEDIA_CAST_SENDER_H264_VT_ENCODER_H_
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/threading/thread_checker.h"
 #include "media/base/mac/videotoolbox_glue.h"
 #include "media/cast/sender/video_encoder.h"
 
 namespace media {
 namespace cast {
 
 // VideoToolbox implementation of the media::cast::VideoEncoder interface.
 // VideoToolbox makes no guarantees that it is thread safe, so this object is
 // pinned to the thread on which it is constructed.
 class H264VideoToolboxEncoder : public VideoEncoder {
   typedef CoreMediaGlue::CMSampleBufferRef CMSampleBufferRef;
   typedef VideoToolboxGlue::VTCompressionSessionRef VTCompressionSessionRef;
   typedef VideoToolboxGlue::VTEncodeInfoFlags VTEncodeInfoFlags;
 
  public:
   H264VideoToolboxEncoder(
       const scoped_refptr<CastEnvironment>& cast_environment,
       const VideoSenderConfig& video_config,
       const gfx::Size& frame_size,
-      const CastInitializationCallback& initialization_cb);
+      const StatusChangeCallback& status_change_cb);
   ~H264VideoToolboxEncoder() override;
 
   // media::cast::VideoEncoder implementation
   bool CanEncodeVariedFrameSizes() const override;
   bool EncodeVideoFrame(
       const scoped_refptr<media::VideoFrame>& video_frame,
       const base::TimeTicks& reference_time,
       const FrameEncodedCallback& frame_encoded_callback) override;
   void SetBitRate(int new_bit_rate) override;
   void GenerateKeyFrame() override;
@@ skipping 42 matching lines @@
   // Force next frame to be a keyframe.
   bool encode_next_frame_as_keyframe_;
 
   DISALLOW_COPY_AND_ASSIGN(H264VideoToolboxEncoder);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_SENDER_H264_VT_ENCODER_H_