Fix some issues with atomics in the activity tracker.

Fix some issues with atomics in the activity tracker.

BUG=620813
Review-Url: https://codereview.chromium.org/2673083003
Cr-Commit-Position: refs/heads/master@{#448095}
Committed: https://chromium.googlesource.com/chromium/src/+/4f94b087ba0f8a6440fcedaf65e62c3571b518ee

[bcwhite, 2017-02-03 19:25:26]

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

[commit-bot: I haz the power, 2017-02-03 19:26:14]

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

[bcwhite, 2017-02-03 19:27:39]

bcwhite@chromium.org changed reviewers:
+ manzagop@chromium.org

[manzagop (departed), 2017-02-03 19:44:19]

lgtm

[commit-bot: I haz the power, 2017-02-03 21:50:30]

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

[commit-bot: I haz the power, 2017-02-03 21:50:31]

Dry run: This issue passed the CQ dry run.

[bcwhite, 2017-02-03 22:10:59]

The CQ bit was checked by bcwhite@chromium.org

[commit-bot: I haz the power, 2017-02-03 22:11:32]

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, 2017-02-03 22:43:29]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1486159859542570, "parent_rev":
"2d63693b08d1ccf5e40aeaa8edb20bf86ec9ab3e", "commit_rev":
"4f94b087ba0f8a6440fcedaf65e62c3571b518ee"}

[commit-bot: I haz the power, 2017-02-03 22:44:00]

Description was changed from

==========
Fix some issues with atomics in the activity tracker.

BUG=620813
==========

to

==========
Fix some issues with atomics in the activity tracker.

BUG=620813

Review-Url: https://codereview.chromium.org/2673083003
Cr-Commit-Position: refs/heads/master@{#448095}
Committed:
https://chromium.googlesource.com/chromium/src/+/4f94b087ba0f8a6440fcedaf65e6...
==========

[commit-bot: I haz the power, 2017-02-03 22:44:01]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/4f94b087ba0f8a6440fcedaf65e6...