MediaStream VideoTrack implementation.
This implementation only use Chrome video classes for local rendering.
A libjingle representation is created once its connected to a PeerConnection.


BUG=334241

Review URL: https://codereview.chromium.org/155853002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255846 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255846