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This CL adds the ability to get a MediaControllerBridge from a
presentation ID. The presentation ID is first converted to a route ID,
before being sent to the MediaRouterAndroid.

The MediaControllerBridge allows native code to forward commands to a
Java MediaController. Currently, only RemotePlayback will use this
path, and the Java MediaController interface is only implemented by
the RemoteMediaPlayerWrapper.

Bug: 790766
Change-Id: Ie089aff905fffd2521053620f79fe739ab6eb3a1
Reviewed-on: https://chromium-review.googlesource.com/930472Reviewed-by: Nick Carter <nick@chromium.org>
Reviewed-by: Derek Cheng <imcheng@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542646}