-A swapped the param order on MediaBrowser.MediaItem constructor
-Added a missing aidl file for MediaItem
bug:17205016
Change-Id: I61538d76f76a993ed5a47b881e0d291fef1d8db3
Since we converted MediaDescription over to using a String media id
for identifying everything we should also use Strings in the browser
service to make it clear that it should re-use that field.
bug:17333205
Change-Id: I5fd5762bdad05068f5b1aa36074306b43432e686