Switch to keyboard mic layout for WebRTC if conditions are met.

Switch to keyboard mic layout for WebRTC if conditions are met.

Conditions:
* Track processing is enabled.
* Experimental constraint is set.
* Keyboard mic is supported (reported via effect).
* The ordinary layout is stereo.

This CL will be landed last of the keyboard mic support CLs.

BUG=345296
Committed: https://crrev.com/041040af18ab3e1c8c67dfecdf5eddfbedf44cc7
Cr-Commit-Position: refs/heads/master@{#296689}

[Henrik Grunell, 2014-09-23 13:26:29]

grunell@chromium.org changed reviewers:
+ xians@chromium.org

[Henrik Grunell, 2014-09-23 13:42:06]

grunell@chromium.org changed reviewers:
+ perkj@chromium.org

[Henrik Grunell, 2014-09-23 15:01:19]

grunell@chromium.org changed reviewers:
+ tommi@chromium.org
- perkj@chromium.org

[Henrik Grunell, 2014-09-23 15:01:55]

Removed Per, added Tommi.

Please review Tommi or Shijing whoever makes it first. :)

[tommi (sloooow) - chröme, 2014-09-23 17:27:00]

first!
lgtm w/nit

https://codereview.chromium.org/598563002/diff/1/content/renderer/media/webrt...
File content/renderer/media/webrtc_audio_capturer.cc (right):

https://codereview.chromium.org/598563002/diff/1/content/renderer/media/webrt...
content/renderer/media/webrtc_audio_capturer.cc:166:
media::AudioParameters::KEYBOARD_MIC)) {
nit: this seems like the fastest condition to be checking. make first?

[Henrik Grunell, 2014-09-25 10:08:36]

https://codereview.chromium.org/598563002/diff/1/content/renderer/media/webrt...
File content/renderer/media/webrtc_audio_capturer.cc (right):

https://codereview.chromium.org/598563002/diff/1/content/renderer/media/webrt...
content/renderer/media/webrtc_audio_capturer.cc:166:
media::AudioParameters::KEYBOARD_MIC)) {
On 2014/09/23 17:27:00, tommi wrote:
> nit: this seems like the fastest condition to be checking. make first?

Done.

[Henrik Grunell, 2014-09-25 10:08:40]

The CQ bit was checked by grunell@chromium.org

[commit-bot: I haz the power, 2014-09-25 10:09:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/598563002/40001

[commit-bot: I haz the power, 2014-09-25 11:00:07]

Committed patchset #3 (id:40001) as 87760b831c443ca23ae0a23c8777350a3e873efa

[commit-bot: I haz the power, 2014-09-25 11:00:44]

Patchset 3 (id:??) landed as
https://crrev.com/041040af18ab3e1c8c67dfecdf5eddfbedf44cc7
Cr-Commit-Position: refs/heads/master@{#296689}