MediaStream Recorder: implement pause() and resume()

MediaStream Recorder: implement pause() and resume()

This CL connects media_recorder_handler.cc:pause() and resume()
to newly added methods with the same name in VideoTrackRecorder.
This two, in turn, set a flag in VideoTrackRecorder::VideoEncoder.
Frames are not encoded while in pause, and ignored.

BUG=543706
Committed: https://crrev.com/522ca0aaa965531019842259f89139a97c90d1a7
Cr-Commit-Position: refs/heads/master@{#355314}

[mcasas, 2015-10-20 01:21:45]

Patchset #1 (id:1) has been deleted

[mcasas, 2015-10-20 01:38:25]

Patchset #1 (id:20001) has been deleted

[mcasas, 2015-10-20 02:19:23]

Patchset #1 (id:40001) has been deleted

[mcasas, 2015-10-20 21:43:25]

mcasas@chromium.org changed reviewers:
+ emircan@chromium.org

[mcasas, 2015-10-20 21:43:26]

emircan@ PTAL

[emircan, 2015-10-20 22:00:27]

lgtm % nit

https://chromiumcodereview.appspot.com/1417673002/diff/60001/content/renderer...
File content/renderer/media/video_track_recorder.cc (right):

https://chromiumcodereview.appspot.com/1417673002/diff/60001/content/renderer...
content/renderer/media/video_track_recorder.cc:172: return;
Move to l.167?

[mcasas, 2015-10-21 00:08:31]

mcasas@chromium.org changed reviewers:
+ ajose@chromium.org

[mcasas, 2015-10-21 00:08:31]

ajose@ PTAL

[ajose, 2015-10-21 01:39:20]

On 2015/10/21 00:08:31, mcasas wrote:
> ajose@ PTAL

lgtm

[mcasas, 2015-10-21 15:56:56]

The CQ bit was checked by mcasas@chromium.org

[commit-bot: I haz the power, 2015-10-21 15:57:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1417673002/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1417673002/60001

[commit-bot: I haz the power, 2015-10-21 17:01:05]

Committed patchset #1 (id:60001)

[commit-bot: I haz the power, 2015-10-21 17:02:01]

Patchset 1 (id:??) landed as
https://crrev.com/522ca0aaa965531019842259f89139a97c90d1a7
Cr-Commit-Position: refs/heads/master@{#355314}