ozone: evdev: Fix possibility of stuck keys with libevdev

ozone: evdev: Fix possibility of stuck keys with libevdev

Same as previous unplug fix, but for the libevdev/gestures path. This
applies to hybrid keyboards with attached mouse/touchpad.

The SYN_DROPPED part is N/A because that is handled by libevdev.

BUG=463002
TEST=Tested unplug by unplugging devices with shift held.
  Shift gets properly released rather than being stuck.
  (NB: Could not reproduce without adding a delay to expose the race).

Committed: https://crrev.com/d415c687891e096b3e2d10e656842d59a86a51ea
Cr-Commit-Position: refs/heads/master@{#319673}

[spang, 2015-03-06 23:41:20]

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

[spang, 2015-03-09 16:40:03]

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

[kpschoedel, 2015-03-09 17:05:33]

I'd travel two thousand miles just to LGTM this patch.

[spang, 2015-03-09 17:18:20]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2015-03-09 17:18:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/990483002/1

[commit-bot: I haz the power, 2015-03-09 17:43:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-09 17:43:58]

Patchset 1 (id:??) landed as
https://crrev.com/d415c687891e096b3e2d10e656842d59a86a51ea
Cr-Commit-Position: refs/heads/master@{#319673}