Hide the mouse cursor if it is empty.

Hide the mouse cursor if it is empty.

Previously the client cursor would revert to a default arrow if the
host cursor was hidden or empty, or in mouse-lock mode.

BUG=429368
Committed: https://crrev.com/e578b111e76e6b9b1240dfca6ccc92ee352e3596
Cr-Commit-Position: refs/heads/master@{#302366}

[Wez, 2014-10-31 23:30:26]

wez@chromium.org changed reviewers:
+ jamiewalch@chromium.org

[Jamie, 2014-10-31 23:54:21]

lgtm

[Wez, 2014-10-31 23:58:46]

The CQ bit was checked by wez@chromium.org

[commit-bot: I haz the power, 2014-10-31 23:59:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/696873002/1

[commit-bot: I haz the power, 2014-11-01 00:41:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-01 00:42:46]

Patchset 1 (id:??) landed as
https://crrev.com/e578b111e76e6b9b1240dfca6ccc92ee352e3596
Cr-Commit-Position: refs/heads/master@{#302366}