tree 0954de08245da4970b6f2aa309d11f6b17c6a3be
parent 003fdb5b76ccc537d4ab7ef19c8a2e3be19b594c
author Wei Jia <wjia@google.com> 1517959763 -0800
committer Wei Jia <wjia@google.com> 1518112346 -0800

NuPlayer2: add srcId for source.

Also add prepareNextDataSource for playlist.
Test: MediaPlayer2 plays
Bug: 63934228
Change-Id: I7386b60019323b36632f3b3275c4513433ee6e2e