Add libvpx wrapper to media to support VP9 video decoding.

webkit/media/filter_helpers.cc

Index: webkit/media/filter_helpers.cc
diff --git a/webkit/media/filter_helpers.cc b/webkit/media/filter_helpers.cc
index 3500f66f39a1e15e8c3b89e17fb3b85ed272faf7..6cd0ea957799c352d3a905ee45f5f4376dcb3a1d 100644
--- a/webkit/media/filter_helpers.cc
+++ b/webkit/media/filter_helpers.cc
@@ -14,6 +14,7 @@
 #include "media/filters/ffmpeg_demuxer.h"
 #include "media/filters/ffmpeg_video_decoder.h"
 #include "media/filters/opus_audio_decoder.h"
+#include "media/filters/vpx_video_decoder.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebURL.h"
 #include "webkit/media/media_stream_client.h"
 
@@ -43,6 +44,12 @@ static void AddDefaultDecodersToCollection(
   scoped_refptr<media::FFmpegVideoDecoder> ffmpeg_video_decoder =
       new media::FFmpegVideoDecoder(message_loop);
   filter_collection->GetVideoDecoders()->push_back(ffmpeg_video_decoder);
+
+  if (cmd_line->HasSwitch(switches::kEnableVp9Playback)) {
+    scoped_refptr<media::VpxVideoDecoder> vpx_video_decoder =
+        new media::VpxVideoDecoder(message_loop);
+    filter_collection->GetVideoDecoders()->push_back(vpx_video_decoder);
+  }
 }
 
 bool BuildMediaStreamCollection(