Re-add sourceSetTimestampOffset to webmediaplayer_impl

sourceSetTimestampOffset() was removed in r150129 because it looked like it wasn't being used.  It just hadn't been hooked up to WebKit yet.  This patch will add it back.

BUG=141659

Review URL: https://chromiumcodereview.appspot.com/10823260

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150894 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed