Prevent a thread startup race in ScheduleWorkTest which causes a nullptr dereference of a message p…

Prevent a thread startup race in ScheduleWorkTest which causes a nullptr dereference of a message pump.

Committed: https://crrev.com/7fc519fa5164f2eb7c718de2d0ed7500e11fc690
Cr-Commit-Position: refs/heads/master@{#342741}

[Anand Mistry (off Chromium), 2015-08-10 04:25:17]

amistry@chromium.org changed reviewers:
+ kinuko@chromium.org

[Anand Mistry (off Chromium), 2015-08-10 04:25:17]

kinuko: I believe this was introduced in
crrev.com/7f68f8735355c1c73557c3cfb294b441901fc31d

[kinuko, 2015-08-10 04:58:03]

lgtm, thx for catching this!

[Anand Mistry (off Chromium), 2015-08-10 05:04:11]

amistry@chromium.org changed reviewers:
+ danakj@chromium.org

[Anand Mistry (off Chromium), 2015-08-10 05:04:11]

danakj@chromium.org: For OWNERS.

[danakj, 2015-08-10 18:08:43]

LGTM

[Anand Mistry (off Chromium), 2015-08-10 23:44:38]

The CQ bit was checked by amistry@chromium.org

[commit-bot: I haz the power, 2015-08-10 23:45:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1283543007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1283543007/1

[commit-bot: I haz the power, 2015-08-10 23:50:54]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-10 23:51:34]

Patchset 1 (id:??) landed as
https://crrev.com/7fc519fa5164f2eb7c718de2d0ed7500e11fc690
Cr-Commit-Position: refs/heads/master@{#342741}