Check that XOpenDevice() returns valid device_id.

Check that XOpenDevice() returns valid device_id.

XOpenDevice() is sometimes returning a non-null XDevice* but the
contents are garbage. This shouldn't be happening but for now we can
check if the device_id is correct. If not, we exit early to avoid a
crash from X BadDevice error.

BUG=659261
Committed: https://crrev.com/c32a70410b6c23d686dce57bd72080f43a3e5a60
Cr-Commit-Position: refs/heads/master@{#429199}

[kylechar, 2016-11-01 21:03:48]

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

[sadrul, 2016-11-02 01:26:25]

lgtm

[kylechar, 2016-11-02 02:51:57]

The CQ bit was checked by kylechar@chromium.org

[commit-bot: I haz the power, 2016-11-02 02:52:15]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-02 03:57:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-02 04:02:38]

Description was changed from

==========
Check that XOpenDevice() returns valid device_id.

XOpenDevice() is sometimes returning a non-null XDevice* but the
contents are garbage. This shouldn't be happening but for now we can
check if the device_id is correct. If not, we exit early to avoid a
crash from X BadDevice error.

BUG=659261
==========

to

==========
Check that XOpenDevice() returns valid device_id.

XOpenDevice() is sometimes returning a non-null XDevice* but the
contents are garbage. This shouldn't be happening but for now we can
check if the device_id is correct. If not, we exit early to avoid a
crash from X BadDevice error.

BUG=659261

Committed: https://crrev.com/c32a70410b6c23d686dce57bd72080f43a3e5a60
Cr-Commit-Position: refs/heads/master@{#429199}
==========

[commit-bot: I haz the power, 2016-11-02 04:02:38]

Patchset 1 (id:??) landed as
https://crrev.com/c32a70410b6c23d686dce57bd72080f43a3e5a60
Cr-Commit-Position: refs/heads/master@{#429199}