Implement MediaSourceDelegate::SetDuration() for android

Implement MediaSourceDelegate::SetDuration() for android

Notify MediaPlayerClient and (Android) MediaSourcePlayer when
MediaSourceDelegate's ChunkDemuxer duration changes:
* Bind WebMediaPlayerAndroid::OnDurationChanged() to
  render loop to asynchronously handle callback from
  MediaSourceDelegate::SetDuration().
* Cache the updated duration in WMPA.  This needs
simplification in blink so this caching doesn't break MSE
spec conformance.  Prerequisite blink change:
https://codereview.chromium.org/15735030/)
* Add IPC for WebMediaPlayerAndroid to notify (Android)
  MediaSourcePlayer when MediaSourceDelegate/ChunkDemuxer updates duration.

With this patch, the following MSE layout tests now pass:
webkitmediasource-duration-boundaryconditions.html
webkitmediasource-duration-changed.html
webkitmediasource-seek-to-end-after-duration-change.html

BUG=246757,233420
TEST=manual verification of MSE layout tests show no regression
R=acolwell@chromium.org,yfriedman@chromium.org,qinmin@chromium.org,wonsik@chromium.org, jschuh@chromium.org

Review URL: https://chromiumcodereview.appspot.com/16372002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205697 0039d316-1c4b-4281-b951-d872f2087c98