Reland "Adding media controls to MediaNotification"

Reland "Adding media controls to MediaNotification"

Relanding this CL since it was previously reverted due to a wrong
speculate on the bot.

This CL adds new media controls to MediaNotification. The controls are
enabled from the MediaSession API in blink, and is propagated to the
browser side through mojom MediaSessionService. Then we show a
corresponding button in media notification. When the user clicks the
button, the event will be propagate back to the page through mojom
MediaSessionClient.

This CL has the following changes:
* Plumb media control messages from content/ to chrome/ Java.
* Add control buttons to MediaNotification

Slides explaining how media controls work:
https://docs.google.com/a/google.com/presentation/d/1jGNB9aT3mbpPszC3SiQnQ70CjVDmH-haomHCrqSVVAw/edit?usp=sharing

Test URL:
http://xxyzzzq.github.io/sandbox/media-session/full-test.html

BUG=656563
TBR=kenrb@chromium.org, tedchoc@chromium.org, avayvod@chromium.org, jam@chromium.org, boliu@chromium.org
TEST=MANUAL

Committed: https://crrev.com/015da1aa7fe79abc631ea59ac5ed0e2a7dfb1944
Cr-Commit-Position: refs/heads/master@{#429864}

[Zhiqiang Zhang (Slow), 2016-11-04 10:46:07]

Description was changed from

==========
Reland "Adding media controls to MediaNotification"

Relanding this CL since it was previously reverted due to a wrong
speculate on the bot.

This CL adds new media controls to MediaNotification. The controls are
enabled from the MediaSession API in blink, and is propagated to the
browser side through mojom MediaSessionService. Then we show a
corresponding button in media notification. When the user clicks the
button, the event will be propagate back to the page through mojom
MediaSessionClient.

This CL has the following changes:
* Plumb media control messages from content/ to chrome/ Java.
* Add control buttons to MediaNotification

Slides explaining how media controls work:
https://docs.google.com/a/google.com/presentation/d/1jGNB9aT3mbpPszC3SiQnQ70C...

Test URL:
http://xxyzzzq.github.io/sandbox/media-session/full-test.html

BUG=656563
TEST=MANUAL
==========

to

==========
Reland "Adding media controls to MediaNotification"

Relanding this CL since it was previously reverted due to a wrong
speculate on the bot.

This CL adds new media controls to MediaNotification. The controls are
enabled from the MediaSession API in blink, and is propagated to the
browser side through mojom MediaSessionService. Then we show a
corresponding button in media notification. When the user clicks the
button, the event will be propagate back to the page through mojom
MediaSessionClient.

This CL has the following changes:
* Plumb media control messages from content/ to chrome/ Java.
* Add control buttons to MediaNotification

Slides explaining how media controls work:
https://docs.google.com/a/google.com/presentation/d/1jGNB9aT3mbpPszC3SiQnQ70C...

Test URL:
http://xxyzzzq.github.io/sandbox/media-session/full-test.html

BUG=656563
TBR=kenrb@chromium.org, tedchoc@chromium.org, avayvod@chromium.org,
jam@chromium.org, boliu@chromium.org
TEST=MANUAL
==========

[Zhiqiang Zhang (Slow), 2016-11-04 10:46:42]

The CQ bit was checked by zqzhang@chromium.org

[commit-bot: I haz the power, 2016-11-04 10:46:59]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-04 12:11:17]

Description was changed from

==========
Reland "Adding media controls to MediaNotification"

Relanding this CL since it was previously reverted due to a wrong
speculate on the bot.

This CL adds new media controls to MediaNotification. The controls are
enabled from the MediaSession API in blink, and is propagated to the
browser side through mojom MediaSessionService. Then we show a
corresponding button in media notification. When the user clicks the
button, the event will be propagate back to the page through mojom
MediaSessionClient.

This CL has the following changes:
* Plumb media control messages from content/ to chrome/ Java.
* Add control buttons to MediaNotification

Slides explaining how media controls work:
https://docs.google.com/a/google.com/presentation/d/1jGNB9aT3mbpPszC3SiQnQ70C...

Test URL:
http://xxyzzzq.github.io/sandbox/media-session/full-test.html

BUG=656563
TBR=kenrb@chromium.org, tedchoc@chromium.org, avayvod@chromium.org,
jam@chromium.org, boliu@chromium.org
TEST=MANUAL
==========

to

==========
Reland "Adding media controls to MediaNotification"

Relanding this CL since it was previously reverted due to a wrong
speculate on the bot.

This CL adds new media controls to MediaNotification. The controls are
enabled from the MediaSession API in blink, and is propagated to the
browser side through mojom MediaSessionService. Then we show a
corresponding button in media notification. When the user clicks the
button, the event will be propagate back to the page through mojom
MediaSessionClient.

This CL has the following changes:
* Plumb media control messages from content/ to chrome/ Java.
* Add control buttons to MediaNotification

Slides explaining how media controls work:
https://docs.google.com/a/google.com/presentation/d/1jGNB9aT3mbpPszC3SiQnQ70C...

Test URL:
http://xxyzzzq.github.io/sandbox/media-session/full-test.html

BUG=656563
TBR=kenrb@chromium.org, tedchoc@chromium.org, avayvod@chromium.org,
jam@chromium.org, boliu@chromium.org
TEST=MANUAL
==========

[commit-bot: I haz the power, 2016-11-04 12:11:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-04 12:13:50]

Description was changed from

==========
Reland "Adding media controls to MediaNotification"

Relanding this CL since it was previously reverted due to a wrong
speculate on the bot.

This CL adds new media controls to MediaNotification. The controls are
enabled from the MediaSession API in blink, and is propagated to the
browser side through mojom MediaSessionService. Then we show a
corresponding button in media notification. When the user clicks the
button, the event will be propagate back to the page through mojom
MediaSessionClient.

This CL has the following changes:
* Plumb media control messages from content/ to chrome/ Java.
* Add control buttons to MediaNotification

Slides explaining how media controls work:
https://docs.google.com/a/google.com/presentation/d/1jGNB9aT3mbpPszC3SiQnQ70C...

Test URL:
http://xxyzzzq.github.io/sandbox/media-session/full-test.html

BUG=656563
TBR=kenrb@chromium.org, tedchoc@chromium.org, avayvod@chromium.org,
jam@chromium.org, boliu@chromium.org
TEST=MANUAL
==========

to

==========
Reland "Adding media controls to MediaNotification"

Relanding this CL since it was previously reverted due to a wrong
speculate on the bot.

This CL adds new media controls to MediaNotification. The controls are
enabled from the MediaSession API in blink, and is propagated to the
browser side through mojom MediaSessionService. Then we show a
corresponding button in media notification. When the user clicks the
button, the event will be propagate back to the page through mojom
MediaSessionClient.

This CL has the following changes:
* Plumb media control messages from content/ to chrome/ Java.
* Add control buttons to MediaNotification

Slides explaining how media controls work:
https://docs.google.com/a/google.com/presentation/d/1jGNB9aT3mbpPszC3SiQnQ70C...

Test URL:
http://xxyzzzq.github.io/sandbox/media-session/full-test.html

BUG=656563
TBR=kenrb@chromium.org, tedchoc@chromium.org, avayvod@chromium.org,
jam@chromium.org, boliu@chromium.org
TEST=MANUAL

Committed: https://crrev.com/015da1aa7fe79abc631ea59ac5ed0e2a7dfb1944
Cr-Commit-Position: refs/heads/master@{#429864}
==========

[commit-bot: I haz the power, 2016-11-04 12:13:51]

Patchset 1 (id:??) landed as
https://crrev.com/015da1aa7fe79abc631ea59ac5ed0e2a7dfb1944
Cr-Commit-Position: refs/heads/master@{#429864}