Add is_encrypted() in VideoDecoderConfig.

media/filters/ffmpeg_demuxer.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.
 
 // Implements the Demuxer interface using FFmpeg's libavformat.  At this time
 // will support demuxing any audio/video format thrown at it.  The streams
 // output mime types audio/x-ffmpeg and video/x-ffmpeg and include an integer
 // key FFmpegCodecID which contains the CodecID enumeration value.  The CodecIDs
 // can be used to create and initialize the corresponding FFmpeg decoder.
 //
@@ skipping 66 matching lines @@
   // If |buffer_queue_| is not empty will execute on caller's thread, otherwise
   // will post ReadTask to execute on demuxer's thread. Read will acquire
   // |lock_| for the life of the function so that means |read_cb| must
   // not make calls into FFmpegDemuxerStream directly or that may cause a
   // deadlock. |read_cb| should execute as quickly as possible because
   // |lock_| is held throughout the life of the callback.
   virtual void Read(const ReadCB& read_cb) OVERRIDE;
   virtual void EnableBitstreamConverter() OVERRIDE;
   virtual const AudioDecoderConfig& audio_decoder_config() OVERRIDE;
   virtual const VideoDecoderConfig& video_decoder_config() OVERRIDE;
+  virtual bool is_encrypted() OVERRIDE;
 
   // Returns the range of buffered data in this stream.
   Ranges<base::TimeDelta> GetBufferedRanges() const;
 
   // Returns elapsed time based on the already queued packets.
   // Used to determine stream duration when it's not known ahead of time.
   base::TimeDelta GetElapsedTime() const;
 
  protected:
   virtual ~FFmpegDemuxerStream();
@@ skipping 170 matching lines @@
   // Set if we know duration of the audio stream. Used when processing end of
   // stream -- at this moment we definitely know duration.
   bool duration_known_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegDemuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_FFMPEG_DEMUXER_H_