ozone: evdev: Dispatch events in task

ozone: evdev: Dispatch events in task

This limits the amount of code that must be reentrant in the case of
nested message loops. In particular libgestures is not reentrant; this
fixes getting some modifiers stuck down with a context menu open.

BUG=418787
TEST=manual on link_freon

Committed: https://crrev.com/0abb227c87a36d12e52976466ea7f62f3945e8af
Cr-Commit-Position: refs/heads/master@{#300488}

[spang, 2014-10-20 18:44:39]

spang@chromium.org changed reviewers:
+ kpschoedel@chromium.org

[kpschoedel, 2014-10-20 19:53:11]

lgtm

[spang, 2014-10-21 14:15:30]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2014-10-21 14:16:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/661353006/40001

[commit-bot: I haz the power, 2014-10-21 15:08:53]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2014-10-21 15:09:30]

Patchset 3 (id:??) landed as
https://crrev.com/0abb227c87a36d12e52976466ea7f62f3945e8af
Cr-Commit-Position: refs/heads/master@{#300488}