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

media/webm/webm_cluster_parser.h

Index: media/webm/webm_cluster_parser.h
diff --git a/media/webm/webm_cluster_parser.h b/media/webm/webm_cluster_parser.h
index ea76d30370f9f13e37e19e23cdbfcdb9b98ea108..40a7e516db36ad1c417d5d7e8cc28bcafd8faa1f 100644
--- a/media/webm/webm_cluster_parser.h
+++ b/media/webm/webm_cluster_parser.h
@@ -18,6 +18,7 @@ namespace media {
 class MEDIA_EXPORT WebMClusterParser : public WebMParserClient {
  public:
   typedef std::deque<scoped_refptr<StreamParserBuffer> > BufferQueue;
+  static const int kDecryptionKeySize = 16;

[ddorwin, 2012/07/13 00:48:00]

does not match the more permissive RFC, right?

[fgalligan1, 2012/07/13 21:40:41]

This matches the RFC. I.e. This must be 16 because we specify the encryption
MUST be CTR and 128 bit.

I think what you are referring to is the key_id which currently does not put a
size restriction.

 
   WebMClusterParser(int64 timecode_scale,
                     int audio_track_num,