The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/939486a06a4528cbf69336ac3614f7ffd1e55407

commit 939486a06a4528cbf69336ac3614f7ffd1e55407
Author: Tom Anderson <thomasanderson@chromium.org>
Date: Fri Feb 09 19:44:38 2018

Disable AdSamplerTriggerTest.PageWithMultipleAds on TSAN

BUG= 810840 
TBR=lpz

Change-Id: Ib40f2c459c47df0f3954960e883ac3156af7fa36
Reviewed-on: https://chromium-review.googlesource.com/912152
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Luke Z <lpz@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#535789}
[modify] https://crrev.com/939486a06a4528cbf69336ac3614f7ffd1e55407/components/safe_browsing/triggers/ad_sampler_trigger_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/923d74ef495272d30ae67cb2ffce3c9628455536

commit 923d74ef495272d30ae67cb2ffce3c9628455536
Author: Luke Zielinski <lpz@chromium.org>
Date: Tue Feb 13 16:44:44 2018

Fix tsan flake caused by ad sampling delay.

Seems to be caused by replacing the UI thread's task runner with a test runner.
Instead, just give the ad sampler object a test runner.

Bug:  810840 
Change-Id: I656bda90e80d53a8353b024828f03a334a834e81
Reviewed-on: https://chromium-review.googlesource.com/914532
Commit-Queue: Luke Z <lpz@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Jialiu Lin <jialiul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536384}
[modify] https://crrev.com/923d74ef495272d30ae67cb2ffce3c9628455536/components/safe_browsing/triggers/ad_sampler_trigger.cc
[modify] https://crrev.com/923d74ef495272d30ae67cb2ffce3c9628455536/components/safe_browsing/triggers/ad_sampler_trigger.h
[modify] https://crrev.com/923d74ef495272d30ae67cb2ffce3c9628455536/components/safe_browsing/triggers/ad_sampler_trigger_unittest.cc