am 8138e841: Merge "Support finer seek control on MediaSources." into gingerbread

Merge commit '8138e841a5adb3c5629e263f5a8cb2e936d234ce' into gingerbread-plus-aosp

* commit '8138e841a5adb3c5629e263f5a8cb2e936d234ce':
  Support finer seek control on MediaSources.