Add wrapper class to media for support of Opus audio, and add a command line flag to enable the support.

This initial version of the wrapper provides support for decoding Opus audio in WebM container files, and is disabled by default.

New flag added: --enable-opus-playback

BUG=166094
TEST=Opus audio in WebM containers plays back in <video> elements when --enable-opus-playback is specified on the command line.

Review URL: https://codereview.chromium.org/11416367

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@173663 0039d316-1c4b-4281-b951-d872f2087c98
12 files changed