commit 77db41b769602da7ccc0106c285490f149fe343d
author avayvod <avayvod@chromium.org> Sat Apr 29 04:09:14 2017
committer Commit bot <commit-bot@chromium.org> Sat Apr 29 04:09:14 2017
tree 8618f09283e2fad543e4511456b5a66fff9ed989
parent 6f9127a09a54711eed16c5e386ed02453309ed91

Remove the explicit dependency between HTMLMediaElement and MediaControls
wrt the cast buttons.

OnRemotePlaybackAvailabilityChanged, OnRemotePlaybackConnecting,
and OnRemotePlaybackDisconnected are replaced by MediaControlsMediaEventListener
via an availability callback and listening for connect, connecting and disconnect
events on the RemotePlayback object off the MediaElement.

OnDisableRemotePlaybackAttributeChanged is replaced by a MutationObserver kept by
MediaControlsImpl.

RemotePlayback has methods that allow it to be used from C++ directly.

BUG=517102
TEST=existing and new tests + manual

Review-Url: https://codereview.chromium.org/2782373002
Cr-Commit-Position: refs/heads/master@{#468223}