Restore Mute button for Android media element.

Restore Mute button for Android media element.

There are web sites that start videos muted by default.
We show the MuteUnmute button to let the user manually
unmute the media clip in the same way it works on desktop.

BUG=467252
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=192803

[timav, 2015-03-30 21:33:20]

timav@google.com changed reviewers:
+ qinmin@chromium.org, timav@google.com

[timav, 2015-03-30 21:33:21]

Please review.

[qinmin, 2015-03-30 21:44:12]

lgtm

[Tima Vaisburd, 2015-03-30 23:22:24]

The CQ bit was checked by timav@chromium.org

[commit-bot: I haz the power, 2015-03-30 23:22:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1045103002/1

[commit-bot: I haz the power, 2015-03-30 23:54:50]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-03-30 23:54:51]

Try jobs failed on following builders:
  blink_presubmit on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/blink_presubmit/builds/3...)

[timav, 2015-03-31 00:24:39]

timav@google.com changed reviewers:
+ philipj@opera.com

[timav, 2015-03-31 00:24:39]

Philip, could you, please, review this change? Thanks much.

[philipj_slow, 2015-03-31 05:46:14]

The CQ bit was checked by philipj@opera.com

[philipj_slow, 2015-03-31 05:46:14]

lgtm

[commit-bot: I haz the power, 2015-03-31 05:46:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1045103002/1

[commit-bot: I haz the power, 2015-03-31 05:50:20]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=192803