Focus the contents of popup windows

Focus the contents of popup windows

After we show and activate a popup window from a user gesture, we should
always focus the web contents.

BUG=411332
Committed: https://crrev.com/a92701cc81a54f25bc36510288353b47ac31a34d
Cr-Commit-Position: refs/heads/master@{#297305}

[stevenjb, 2014-09-26 18:27:39]

stevenjb@chromium.org changed reviewers:
+ ben@chromium.org

[stevenjb, 2014-09-26 18:27:39]

I was looking for a way to test this, but:
a) IsActive() is not reliable in all test environments (crbug.com79493)
b) it's not obvious how to query whether or not a WebContents has focus.
I think it is more important to fix this than to fix the tests, but it seems
like something that someone ought to get to eventually.

[stevenjb, 2014-09-29 22:03:26]

Ping. We'd like to fix this for 38.

[Ben Goodger (Google), 2014-09-29 22:35:38]

lgtm

[stevenjb, 2014-09-29 22:35:57]

The CQ bit was checked by stevenjb@chromium.org

[commit-bot: I haz the power, 2014-09-29 22:37:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/599763003/1

[commit-bot: I haz the power, 2014-09-29 23:41:22]

Committed patchset #1 (id:1) as 131fcbb1ae843a8c13f94ad712df1db3aa6a2794

[commit-bot: I haz the power, 2014-09-29 23:42:03]

Patchset 1 (id:??) landed as
https://crrev.com/a92701cc81a54f25bc36510288353b47ac31a34d
Cr-Commit-Position: refs/heads/master@{#297305}