Release the Commands API and add docs for Apps.

Release the Commands Extension API and add docs for Apps.

BUG=302437, 364904, 329878
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=266379

[Yoyo Zhou, 2014-04-25 19:08:35]

LGTM

[Finnur, 2014-04-25 20:28:23]

The CQ bit was checked by finnur@chromium.org

[commit-bot: I haz the power, 2014-04-25 22:06:11]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/finnur@chromium.org/253593003/40001

[commit-bot: I haz the power, 2014-04-26 00:11:25]

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

[commit-bot: I haz the power, 2014-04-26 00:11:25]

Try jobs failed on following builders:
  tryserver.chromium on linux_chromium_chromeos_rel

[Finnur, 2014-04-26 09:34:54]

The CQ bit was checked by finnur@chromium.org

[commit-bot: I haz the power, 2014-04-26 09:35:16]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/finnur@chromium.org/253593003/40001

[commit-bot: I haz the power, 2014-04-26 22:08:45]

Change committed as 266379