Add libvpx wrapper to media to support VP9 video decoding.

media/filters/chunk_demuxer.cc

Index: media/filters/chunk_demuxer.cc
diff --git a/media/filters/chunk_demuxer.cc b/media/filters/chunk_demuxer.cc
index c24528177205f062772182f12f58d951e3766237..c2d57c8fbc4752e0c0e822d0584dfa0b6fc51879 100644
--- a/media/filters/chunk_demuxer.cc
+++ b/media/filters/chunk_demuxer.cc
@@ -40,10 +40,12 @@ struct SupportedTypeInfo {
 };
 
 static const CodecInfo kVP8CodecInfo = { "vp8", DemuxerStream::VIDEO };
+static const CodecInfo kVP9CodecInfo = { "vp9", DemuxerStream::VIDEO };
 static const CodecInfo kVorbisCodecInfo = { "vorbis", DemuxerStream::AUDIO };
 
 static const CodecInfo* kVideoWebMCodecs[] = {
   &kVP8CodecInfo,
+  &kVP9CodecInfo,

[scherkus (not reviewing), 2012/12/18 01:01:56]

if vp9 isn't expected to work with media source, then similar to opus we may
want to back out this changes

[Tom Finegan, 2012/12/18 01:47:42]

Forgot to remove this, done.

   &kVorbisCodecInfo,
   NULL
 };