GitLab

This allows us to put all WPT-specific failures in the new file and turn
waterfall builder green while we whittle away at the failures. The goal
would be to eventually remove this file as all failures get triaged.

The immediate benefit is that this builder starts to give meaningful signals
without being obscured by all of these failures. So we can use it 1) to gauge
flakiness/stability and 2) see results for tests that aren't affected by
failures (eg: some new testdriver APIs like Actions or Payments).

This change was tested by merging into crrev.com/c/1551486 and confirming
the new expectations file was used.

Change-Id: I7f2f83058804cee365e2082cbee9f6c23002d187
Bug: 937369
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1707065
Commit-Queue: Luke Z <lpz@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683329}