The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/363d153b234835ab85f648015bf4622677b31bd2

commit 363d153b234835ab85f648015bf4622677b31bd2
Author: Kenneth Russell <kbr@chromium.org>
Date: Sat Jun 02 23:04:38 2018

Suppress a few flaky layout tests.

Mac:
  virtual/threaded/animations/responsive/
    zoom-responsive-translate-animation.html
  virtual/threaded/http/tests/devtools/tracing/timeline-paint/
    paint-profiler-update.js

All platforms:
  fast/scrolling/scrollbar-tickmarks-hittest.html

Tbr: alph@chromium.org
Tbr: ericwilligers@chromium.org
Tbr: chaopeng@chromium.org
Tbr: pdr@chromium.org
Bug:  848006 ,  849040 , 841567
Change-Id: Ifb356dffc3a149b2e7593bddda21f31df6b1de48
Reviewed-on: https://chromium-review.googlesource.com/1083818
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563951}
[modify] https://crrev.com/363d153b234835ab85f648015bf4622677b31bd2/third_party/WebKit/LayoutTests/TestExpectations