Instrument callers of Semaphore::Signal to help with investigation of

Instrument callers of Semaphore::Signal to help with investigation of
flaky crashes.

BUG=chromium:609249
LOG=NO

Committed: https://crrev.com/5d9f6da6541c24077f236fe9a1837e0e8261a3ea
Cr-Commit-Position: refs/heads/master@{#36106}

[ulan, 2016-05-09 10:54:29]

ulan@chromium.org changed reviewers:
+ mlippautz@chromium.org

[ulan, 2016-05-09 10:54:30]

ptal

[Yang, 2016-05-09 10:55:33]

yangguo@chromium.org changed reviewers:
+ yangguo@chromium.org

[Yang, 2016-05-09 10:55:34]

src/debug lgtm.

[Michael Lippautz, 2016-05-09 11:11:03]

lgtm

[ulan, 2016-05-09 11:25:57]

The CQ bit was checked by ulan@chromium.org

[commit-bot: I haz the power, 2016-05-09 11:26:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1961893002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1961893002/1

[commit-bot: I haz the power, 2016-05-09 11:55:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-09 11:55:46]

Description was changed from

==========
Instrument callers of Semaphore::Signal to help with investigation of
flaky crashes.

BUG=chromium:609249
LOG=NO
==========

to

==========
Instrument callers of Semaphore::Signal to help with investigation of
flaky crashes.

BUG=chromium:609249
LOG=NO

Committed: https://crrev.com/5d9f6da6541c24077f236fe9a1837e0e8261a3ea
Cr-Commit-Position: refs/heads/master@{#36106}
==========

[commit-bot: I haz the power, 2016-05-09 11:55:46]

Patchset 1 (id:??) landed as
https://crrev.com/5d9f6da6541c24077f236fe9a1837e0e8261a3ea
Cr-Commit-Position: refs/heads/master@{#36106}