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This implement an observer of a remote webrtc MediaStream and propagates changes to a WebKit MediaStream.
It propagates adding and removing of remote tracks to existing mediastreams as well as if a remote track has ended.

https://code.google.com/p/webrtc/issues/detail?id=872

BUG=233514

Review URL: https://chromiumcodereview.appspot.com/14200016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195186 0039d316-1c4b-4281-b951-d872f2087c98