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Each of the 6 test cases in this test take a minimum of 200ms due to
the waitForAnimationEndTimeBased call. This was resulting in flakiness
due to being too close to the default timeout for web tests. Fix the
flakiness by separating them into two separate tests.

Leaving these tests disabled as there appears to be a different
underlying issues causing failures on Mac.

Bug: 1038354
Change-Id: I9fbf07f1e5a76e770bb1c028615fa36bbb6123fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2477478
Commit-Queue: Mario Bianucci <mabian@microsoft.com>
Reviewed-by: Rahul Arakeri <arakeri@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#818715}