exo: Fix crash in SetCursor

exo: Fix crash in SetCursor

SetCursor can crash in rare circumstances when no event has been
processed yet, but SetCursor is called by the client.
Adds line to initialize the cursor widget if it does not exist.

BUG=chromium:648724
TEST=none

Committed: https://crrev.com/1d09b45aabcb055e293a19064f1defe1ba2dcbd8
Cr-Commit-Position: refs/heads/master@{#419947}

[denniskempin, 2016-09-20 21:53:02]

denniskempin@google.com changed reviewers:
+ reveman@chromium.org

[denniskempin, 2016-09-20 21:53:02]

PTAL David! Causes rare crashes on my device when used with direct input.

[reveman, 2016-09-21 01:41:42]

The CQ bit was checked by reveman@chromium.org

[reveman, 2016-09-21 01:41:42]

lgtm

[commit-bot: I haz the power, 2016-09-21 01:42:20]

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, 2016-09-21 02:07:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-21 02:09:40]

Description was changed from

==========
exo: Fix crash in SetCursor

SetCursor can crash in rare circumstances when no event has been
processed yet, but SetCursor is called by the client.
Adds line to initialize the cursor widget if it does not exist.

BUG=chromium:648724
TEST=none
==========

to

==========
exo: Fix crash in SetCursor

SetCursor can crash in rare circumstances when no event has been
processed yet, but SetCursor is called by the client.
Adds line to initialize the cursor widget if it does not exist.

BUG=chromium:648724
TEST=none

Committed: https://crrev.com/1d09b45aabcb055e293a19064f1defe1ba2dcbd8
Cr-Commit-Position: refs/heads/master@{#419947}
==========

[commit-bot: I haz the power, 2016-09-21 02:09:41]

Patchset 1 (id:??) landed as
https://crrev.com/1d09b45aabcb055e293a19064f1defe1ba2dcbd8
Cr-Commit-Position: refs/heads/master@{#419947}