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--enable-toggles=skip_validation,foo,bar is the new way to enable
toggles in Dawn's tests. The other command line flags will be
removed.

Bug: dawn:571
Change-Id: Ia917943fb07abb53346ffe0022ff27b01db6f4db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538482Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827853}