Start playing live streaming HLS content from the first segment.
Start playing live streaming HLS content from the first segment.

Also properly signal a "hard" discontinuity, i.e. a possible format change
when a discontinuity is signalled explicitly as part of the playlist.

Change-Id: Ic347d3d11d39b0411c3726a7c723bcf13092b8bc
related-to-bug: 5103155, 5103013

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base