tree 2e1d534f04a5433fbec58887c17f4cdee6901110
parent 7a498a96c082fd6baee468261128e9f0080ef2df
author Jaewan Kim <jaewan@google.com> 1518161006 +0900
committer Jaewan Kim <jaewan@google.com> 1518175880 +0900

MediaSession2: Pull out MediaSession2CallbackStub

It had been in the MediaController2Impl, but it doesn't make sense
because the MediaSession2CallbackStub also handles browser specific
commands.

Test: Run all MediaComponent tests once
Change-Id: I8e8e64c020abbcf87bde3af9db56e601f2a01bb4