MediaSessionCompat: Make playFromUri() work on API 21-22

Since MediaControllerCompat just uses MediaController that doesn't have
playFromUri() on API 21-22, we need to use existing sendCustomAction()
functionality in order to enable playFromUri() on API 21-22.

Bug: 23188907
Change-Id: If3cd379fe2d92cbaa9e005e403dba4c2494d05d4
2 files changed