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There's no real reason not to run this test on iOS/Android, as they define an
AcceleratedWidget type and the test works correctly when they're serialized
appropriately.  The correct struct traits are obvious, so I don't see any
benefit to not defining them.

Bug: none
Change-Id: I58db88a774abb441bb3af8e7f458040214c5fd93
Reviewed-on: https://chromium-review.googlesource.com/c/1343562Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610907}