Fix some TSAN problems in Activity Tracker/Analyzer.

Fix some TSAN problems in Activity Tracker/Analyzer.

BUG=

Committed: https://crrev.com/744f203d6ab20ceaeae9ceb42766bf90f6b68bc2
Cr-Commit-Position: refs/heads/master@{#412284}

[bcwhite, 2016-08-16 11:24:42]

The CQ bit was checked by bcwhite@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-16 11:24:56]

Dry run: 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, 2016-08-16 12:36:36]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-16 12:36:37]

Dry run: This issue passed the CQ dry run.

[tommycli, 2016-08-16 17:32:09]

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

[tommycli, 2016-08-16 17:32:10]

lgtm thanks

[bcwhite, 2016-08-16 17:47:51]

The CQ bit was checked by bcwhite@chromium.org

[commit-bot: I haz the power, 2016-08-16 17:48:07]

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, 2016-08-16 17:52:06]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-08-16 17:54:40]

Description was changed from

==========
Fix some TSAN problems in Activity Tracker/Analyzer.

BUG=
==========

to

==========
Fix some TSAN problems in Activity Tracker/Analyzer.

BUG=

Committed: https://crrev.com/744f203d6ab20ceaeae9ceb42766bf90f6b68bc2
Cr-Commit-Position: refs/heads/master@{#412284}
==========

[commit-bot: I haz the power, 2016-08-16 17:54:41]

Patchset 2 (id:??) landed as
https://crrev.com/744f203d6ab20ceaeae9ceb42766bf90f6b68bc2
Cr-Commit-Position: refs/heads/master@{#412284}

[Alexander Potapenko, 2016-10-14 10:07:33]

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

[Alexander Potapenko, 2016-10-14 10:07:33]

https://codereview.chromium.org/2249683003/diff/20001/base/debug/activity_ana...
File base/debug/activity_analyzer_unittest.cc (right):

https://codereview.chromium.org/2249683003/diff/20001/base/debug/activity_ana...
base/debug/activity_analyzer_unittest.cc:124:
SPIN_FOR_1_SECOND_OR_UNTIL_TRUE(ready_.load(std::memory_order_relaxed));
You're waiting for another thread here, but do not create an actual
happens-before arc.
Accesses to ready_ should be acquire/release instead of relaxed.