RoboErik 031149cd5f Add context to MediaController constructor
This also adds a convenience method to MediaSession to allow getting
a controller instead of having to create and cache your own.

bug:16561220
Change-Id: I87f551a7474e71f1cf2f07e0e541c3a4515cd977
2014-07-28 11:02:15 -07:00
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