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This switch is similar to the existing --wm-window-animations-disabled switch,
which is Aura/Ash-specific, but more tightly scoped and available only on Mac.
This allows tests to disable closure animations for modal dialogs, which take
a few hundred ms each and introduce test flake.

Bug: 817408
Change-Id: Id6d2703d58b25f0efa34085d34f467ad1bf5a912
Reviewed-on: https://chromium-review.googlesource.com/973463
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544884}