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This change ensures that tests that are ready to be migrated into wpt/
will contain consistent formatting. This includes a test_desc constant
describing the test and consistent indentation.

BUG=509038

Change-Id: If04b5cdd796709b8080960550cf216297e8d38f6
Reviewed-on: https://chromium-review.googlesource.com/891989
Commit-Queue: Ovidio Henriquez <odejesush@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Conley Owens <cco3@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533179}