Add autofill preview support for <month> input fields

Add autofill preview support for <month> input fields

Update preview functions to include case for <month> field.
Update tests accordingly.

BUG=335212
R=isherman@chromium.org, jhawkins@chromium.org, tkent@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=254464

[ziran.sun, 2014-01-16 19:51:24]

Please review this in conjunction with 
https://codereview.chromium.org/130213005/

BTW, the "Side-by-side diffs" doesn't seem working for me for this issue. Do let
me know if it happens to you as well or you know a solution. 

Many thanks!

[ziran.sun, 2014-01-17 09:54:38]

Re-uploaded the code. "Side-by-side diffs" view is fixed now.
Thanks!

[Ilya Sherman, 2014-02-08 01:15:10]

LGTM, thanks :)  (Though you'll need to land the Blink-side changes first, of
course.)

[ziran.sun, 2014-02-26 22:45:41]

The CQ bit was checked by ziran.sun@samsung.com

[commit-bot: I haz the power, 2014-02-26 22:46:13]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ziran.sun@samsung.com/140903004/310001

[commit-bot: I haz the power, 2014-02-26 23:19:17]

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

[commit-bot: I haz the power, 2014-02-26 23:19:17]

Retried try job too often on win_rel for step(s) base_unittests, browser_tests,
interactive_ui_tests, net_unittests, unit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[ziran.sun, 2014-02-27 16:49:06]

The CQ bit was checked by ziran.sun@samsung.com

[commit-bot: I haz the power, 2014-02-27 16:49:41]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ziran.sun@samsung.com/140903004/310001

[commit-bot: I haz the power, 2014-02-27 17:58:57]

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

[commit-bot: I haz the power, 2014-02-27 17:58:57]

Try jobs failed on following builders: linux_chromium_rel

[ziran.sun, 2014-02-27 18:20:15]

The CQ bit was checked by ziran.sun@samsung.com

[commit-bot: I haz the power, 2014-02-27 18:24:25]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ziran.sun@samsung.com/140903004/380001

[commit-bot: I haz the power, 2014-02-27 18:55:46]

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

[commit-bot: I haz the power, 2014-02-27 18:55:47]

Retried try job too often on chromium_presubmit for step(s) presubmit
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=chromium_p...

[Ilya Sherman, 2014-02-27 22:17:48]

Looks like the "FormAutofillTest.PreviewForm" browser test is failing.

[Ilya Sherman, 2014-02-28 21:25:58]

The CQ bit was checked by isherman@chromium.org

[commit-bot: I haz the power, 2014-02-28 21:27:20]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ziran.sun@samsung.com/140903004/380001

[commit-bot: I haz the power, 2014-02-28 21:28:01]

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

[commit-bot: I haz the power, 2014-02-28 21:28:01]

Try jobs failed on following builders: linux_chromium_rel, mac_chromium_rel

[Ilya Sherman, 2014-02-28 21:28:31]

The CQ bit was checked by isherman@chromium.org

[commit-bot: I haz the power, 2014-02-28 21:30:11]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ziran.sun@samsung.com/140903004/380001

[commit-bot: I haz the power, 2014-02-28 21:31:54]

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

[commit-bot: I haz the power, 2014-02-28 21:31:55]

Try jobs failed on following builders: linux_chromium_rel, mac_chromium_rel

[Ilya Sherman, 2014-02-28 22:01:52]

Ziran, please try rebasing and uploading a new patch set, then checking the CQ
bit again.

[ziran.sun, 2014-03-03 11:18:38]

The CQ bit was checked by ziran.sun@samsung.com

[commit-bot: I haz the power, 2014-03-03 11:18:44]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ziran.sun@samsung.com/140903004/400001

[commit-bot: I haz the power, 2014-03-03 15:09:17]

Change committed as 254464