Restore virtual keyboard after switch back to FULL_WIDTH mode

Restore virtual keyboard after switch back to FULL_WIDTH mode

After user decided to switch back to FULL_WIDTH mode, Chrome should:
1. immediately position the virtual keyboard to the bottom of screen and use
the screen width as its window width
2. notify web contents about the new virtual keyboard bounds so web contents
can be scrolled correctly to avoid occlussion.

BUG=487343
Committed: https://crrev.com/d3bb267e8e6043eb37074f27673a13d83c89c052
Cr-Commit-Position: refs/heads/master@{#329690}

[bshe, 2015-05-12 18:33:45]

bshe@chromium.org changed reviewers:
+ sadrul@chromium.org

[bshe, 2015-05-12 18:33:46]

Hey Sadrul.

Do you mind to take a look at this CL? Thanks!

Biao

[sadrul, 2015-05-12 19:41:43]

Can this have a test?

[bshe, 2015-05-12 22:04:00]

On 2015/05/12 19:41:43, sadrul wrote:
> Can this have a test?

definitely! I was planning to add it later but it turns out to be pretty
trivial. PTAL, thanks!

[sadrul, 2015-05-13 16:34:54]

Thanks! lgtm

[bshe, 2015-05-13 18:16:34]

The CQ bit was checked by bshe@chromium.org

[commit-bot: I haz the power, 2015-05-13 18:18:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1138873003/20001

[commit-bot: I haz the power, 2015-05-13 19:06:52]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-13 19:07:39]

Patchset 2 (id:??) landed as
https://crrev.com/d3bb267e8e6043eb37074f27673a13d83c89c052
Cr-Commit-Position: refs/heads/master@{#329690}