This mostly affects site_per_process_webkit_layout_tests, but has also happened in webkit_layout_tests (for linux_chromium_rel_ng). In the last day it has interrupted 20 CLs CQ/tryjob attempts.

I'm not yet clear if there was a recent change which might explain this uptick in flakiness (it's very flaky, check out https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=site_per_process_webkit_layout_tests%20(with%20patch)&tests=virtual%2Fandroid%2Frootscroller%2Fremove-rootscroller-crash.html). Investigating that initially, then will disable shortly if I can't find something.

cc bokan@ - original author of the test

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b495337270b894d23166c3c17e511459d15c162c

commit b495337270b894d23166c3c17e511459d15c162c
Author: Stephen McGruer <smcgruer@chromium.org>
Date: Wed Oct 03 15:12:01 2018

[Sheriff] Mark virtual/android/rootscroller/remove-rootscroller-crash.html flaky

Test appears to be heavily timeout-flaky, unclear as to why it suddenly
became flaky at this time.

Bug: 891530
Change-Id: I1d097662b7a9f6fbb35999d5553224ac4a24a2b5

TBR=bokan@chromium.org

Change-Id: I1d097662b7a9f6fbb35999d5553224ac4a24a2b5
Reviewed-on: https://chromium-review.googlesource.com/c/1258620
Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596215}
[modify] https://crrev.com/b495337270b894d23166c3c17e511459d15c162c/third_party/WebKit/LayoutTests/TestExpectations

Test disabled, removing from sheriff queue

virtual/android/rootscroller/remove-rootscroller-crash.html is flaky.

Findit has detected 20 new flake occurrences of this test. List
of all flake occurrences can be found at:
https://findit-for-me.appspot.com/flake/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVyYwsSBUZsYWtlIlhjaHJvbWl1bUB3ZWJraXRfbGF5b3V0X3Rlc3RzQHZpcnR1YWwvYW5kcm9pZC9yb290c2Nyb2xsZXIvcmVtb3ZlLXJvb3RzY3JvbGxlci1jcmFzaC5odG1sDA.

Since this test is still flaky, this issue has been moved back onto the Sheriff
Bug Queue if it's not already there.

If the result above is wrong, please file a bug using this link:
https://bugs.chromium.org/p/chromium/issues/entry?status=Unconfirmed&labels=Pri-1,Test-Findit-Wrong&components=Tools%3ETest%3EFindit%3EFlakiness&summary=%5BFindit%5D%20Flake%20Detection%20-%20Wrong%20result%20for%20virtual/android/rootscroller/remove-rootscroller-crash.html&comment=Link%20to%20flake%20occurrences%3A%20https://findit-for-me.appspot.com/flake/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVyYwsSBUZsYWtlIlhjaHJvbWl1bUB3ZWJraXRfbGF5b3V0X3Rlc3RzQHZpcnR1YWwvYW5kcm9pZC9yb290c2Nyb2xsZXIvcmVtb3ZlLXJvb3RzY3JvbGxlci1jcmFzaC5odG1sDA

Automatically posted by the findit-for-me app (https://goo.gl/Ot9f7N).

Removing from sheriff queue again. All the flakes are before the test was marked as flaky.