[Media>Session] Pause all players for non-routed frames when receiving PAUSE action

[Media>Session] Pause all players for non-routed frames when receiving PAUSE action

Previously, when a page uses MediaSession API, the PAUSE action is only
sent to the frame that is routed, other frames may be still playing
media, causing the session to be still active. In this CL, apart from
sending the PAUSE action to the frame, we pause the players in all
non-routed frames.

BUG=685978
Review-Url: https://codereview.chromium.org/2660263002
Cr-Commit-Position: refs/heads/master@{#449622}
(cherry picked from commit ded5aed116f603b4d7e4e5b83abeb25e7f802198)

Review-Url: https://codereview.chromium.org/2685373002 .
Cr-Commit-Position: refs/branch-heads/2987@{#437}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/9a550d13567114af60c8f287393c3bec87c3d79c

[Zhiqiang Zhang (Slow), 2017-02-10 16:07:46]

Description was changed from

==========
[Media>Session] Pause all players for non-routed frames when receiving PAUSE
action

Previously, when a page uses MediaSession API, the PAUSE action is only
sent to the frame that is routed, other frames may be still playing
media, causing the session to be still active. In this CL, apart from
sending the PAUSE action to the frame, we pause the players in all
non-routed frames.

BUG=685978

Review-Url: https://codereview.chromium.org/2660263002
Cr-Commit-Position: refs/heads/master@{#449622}
(cherry picked from commit ded5aed116f603b4d7e4e5b83abeb25e7f802198)
==========

to

==========
[Media>Session] Pause all players for non-routed frames when receiving PAUSE
action

Previously, when a page uses MediaSession API, the PAUSE action is only
sent to the frame that is routed, other frames may be still playing
media, causing the session to be still active. In this CL, apart from
sending the PAUSE action to the frame, we pause the players in all
non-routed frames.

BUG=685978

Review-Url: https://codereview.chromium.org/2660263002
Cr-Commit-Position: refs/heads/master@{#449622}
(cherry picked from commit ded5aed116f603b4d7e4e5b83abeb25e7f802198)

Review-Url: https://codereview.chromium.org/2685373002 .
Cr-Commit-Position: refs/branch-heads/2987@{#437}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/9a550d13567114af60c8f287393c...
==========

[Zhiqiang Zhang (Slow), 2017-02-10 16:07:48]

Committed patchset #1 (id:1) manually as
9a550d13567114af60c8f287393c3bec87c3d79c.