Automatically wait for elements to be displayed in the password manager python tests

Automatically wait for elements to be displayed in the
password manager python tests.
Automatically wait for DOM element visibly at the beginning of
actions (click, submit) in the password manager python tests.

BUG=411325
Committed: https://crrev.com/db1f2fe9dd048496f1ce3689ec2fd55f62eed88a
Cr-Commit-Position: refs/heads/master@{#293557}

[rchtara, 2014-09-05 15:54:56]

rchtara@chromium.org changed reviewers:
+ battre@chromium.org, vabr@chromium.org

[rchtara, 2014-09-05 16:00:03]

Hi
Could you please review this cl?
Thanks a lot
Riadh

[vabr (Chromium), 2014-09-05 16:07:47]

LGTM.
Thanks!
Vaclav

[rchtara, 2014-09-05 16:13:30]

The CQ bit was checked by rchtara@chromium.org

[rchtara, 2014-09-05 16:14:07]

Thanks a lot for the review
Riadh

[commit-bot: I haz the power, 2014-09-05 16:15:08]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/rchtara@chromium.org/538403003/1

[commit-bot: I haz the power, 2014-09-05 18:15:05]

Committed patchset #1 (id:1) as 22384c877fbd67a56b9b4da973d184ee76ca51a7

[commit-bot: I haz the power, 2014-09-10 03:40:48]

Patchset 1 (id:??) landed as
https://crrev.com/db1f2fe9dd048496f1ce3689ec2fd55f62eed88a
Cr-Commit-Position: refs/heads/master@{#293557}