[heap] Reland concurrent slot filtering in sweeper threads.

[heap] Reland concurrent slot filtering in sweeper threads.

BUG=chromium:648568
Committed: https://crrev.com/4c3a1725399a0bbc0c1222af360900cd845f0f08
Cr-Commit-Position: refs/heads/master@{#40221}

[Hannes Payer (out of office), 2016-10-12 12:37:01]

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

[commit-bot: I haz the power, 2016-10-12 12:37:04]

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

[Hannes Payer (out of office), 2016-10-12 12:43:57]

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

[Michael Lippautz, 2016-10-12 12:51:49]

lgtm

[Hannes Payer (out of office), 2016-10-12 12:52:43]

The CQ bit was unchecked by hpayer@chromium.org

[Hannes Payer (out of office), 2016-10-12 12:52:45]

The CQ bit was checked by hpayer@chromium.org

[commit-bot: I haz the power, 2016-10-12 12:52:54]

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

[ulan, 2016-10-12 12:53:19]

lgtm

[commit-bot: I haz the power, 2016-10-12 13:07:36]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-12 13:07:53]

Description was changed from

==========
[heap] Reland concurrent slot filtering in sweeper threads.

BUG=chromium:648568
==========

to

==========
[heap] Reland concurrent slot filtering in sweeper threads.

BUG=chromium:648568

Committed: https://crrev.com/4c3a1725399a0bbc0c1222af360900cd845f0f08
Cr-Commit-Position: refs/heads/master@{#40221}
==========

[commit-bot: I haz the power, 2016-10-12 13:07:54]

Patchset 1 (id:??) landed as
https://crrev.com/4c3a1725399a0bbc0c1222af360900cd845f0f08
Cr-Commit-Position: refs/heads/master@{#40221}