Add support for encrypted WebM files as defined in the RFC.

media/filters/ffmpeg_video_decoder.h

 // Copyright (c) 2012 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_FILTERS_FFMPEG_VIDEO_DECODER_H_
 #define MEDIA_FILTERS_FFMPEG_VIDEO_DECODER_H_
 
 #include <deque>
 
 #include "base/callback.h"
@@ skipping 18 matching lines @@
   virtual void Initialize(const scoped_refptr<DemuxerStream>& stream,
                           const PipelineStatusCB& status_cb,
                           const StatisticsCB& statistics_cb) OVERRIDE;
   virtual void Read(const ReadCB& read_cb) OVERRIDE;
   virtual void Reset(const base::Closure& closure) OVERRIDE;
   virtual void Stop(const base::Closure& closure) OVERRIDE;
   virtual const gfx::Size& natural_size() OVERRIDE;
 
   // Must be called prior to initialization if decrypted buffers will be
   // encountered.
-  void set_decryptor(AesDecryptor* decryptor);
+  void set_decryptor(HmacAesDecryptor* decryptor);
 
  protected:
   virtual ~FFmpegVideoDecoder();
 
  private:
   enum DecoderState {
     kUninitialized,
     kNormal,
     kFlushCodec,
     kDecodeFinished,
@@ skipping 45 matching lines @@
   int frame_rate_numerator_;
   int frame_rate_denominator_;
 
   // TODO(scherkus): I think this should be calculated by VideoRenderers based
   // on information provided by VideoDecoders (i.e., aspect ratio).
   gfx::Size natural_size_;
 
   // Pointer to the demuxer stream that will feed us compressed buffers.
   scoped_refptr<DemuxerStream> demuxer_stream_;
 
-  AesDecryptor* decryptor_;
+  HmacAesDecryptor* decryptor_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegVideoDecoder);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_FFMPEG_VIDEO_DECODER_H_