+foolip@, +hayato@ and +sclittle@ for suggestions.

I think it's straightforward to me that: "external/wpt/editing/run/delete.html?x-y" should be merged into a meta bug, and "external/wpt/editing/run/forward_delete.html?x-y" should be merged into another meta bug, but it's not obvious to me that "external/wpt/editing/run/delete.html?x-y" and "external/wpt/editing/run/forward_delete.html?x-y" should also be merged into one bug, is there a reliable pattern that can be used to identify such similarities?

It would be a pretty good assumption that tests that differ only by the query parameters are sufficiently similar that if they're all flaky, the cause is the same. This won't always be the case, but creating separate bugs will be more annoying than useful, I suspect.

Thanks for the feedback foolip@!

I'm working on a new Flake Detection to replace the Chromium-try-flakes, and it will be online soon, I will make sure to merge similar webkit layout tests bugs in the new Flake Detection.

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/b3af1592edca7b3cd2a12e3c39a8cd65fe0d4edb

commit b3af1592edca7b3cd2a12e3c39a8cd65fe0d4edb
Author: Yuke Liao <liaoyuke@chromium.org>
Date: Wed Aug 29 19:16:42 2018

[FindIt] Merge webkit_layout_tests differ by queries

This CL merged webkit_layout_tests bugs that only differ by queries.
For example, external/wpt/editing/run/delete.html?1-1000
external/wpt/editing/run/delete.html?1001-2000

Bug:  877974 
Change-Id: I3d5d9fe69da07175c61f98240223315d3a24c7b4
Reviewed-on: https://chromium-review.googlesource.com/1195724
Reviewed-by: Shuotao Gao <stgao@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#17282}
[modify] https://crrev.com/b3af1592edca7b3cd2a12e3c39a8cd65fe0d4edb/appengine/findit/model/flake/detection/flake.py
[modify] https://crrev.com/b3af1592edca7b3cd2a12e3c39a8cd65fe0d4edb/appengine/findit/libs/test_results/gtest_test_results.py
[modify] https://crrev.com/b3af1592edca7b3cd2a12e3c39a8cd65fe0d4edb/appengine/findit/model/flake/detection/test/flake_test.py
[add] https://crrev.com/b3af1592edca7b3cd2a12e3c39a8cd65fe0d4edb/appengine/findit/libs/test/test_name_util_test.py
[rename] https://crrev.com/b3af1592edca7b3cd2a12e3c39a8cd65fe0d4edb/appengine/findit/libs/test_name_util.py
[delete] https://crrev.com/77b987ac614d82d232e98bd680b927af888c1559/appengine/findit/libs/test/gtest_name_util_test.py