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This is a reland of 09566165. Fixed
and ran locally.

TBR=oshima@chromium.org

Original change's description:
> Reland "cros: Add tablet <-> clamshell performance test."
>
> This is a reland of 963bfd6e
>
> Could not reproduce locally with the new changes. Suspected causes for
> flakiness before.
> 1) Rounding down because of int means we never waited for browser to
> startup.
> 2) Disabling animations too early means the creation of the browser window
> has an animation which may have interfered with the tablet window animation.
>
> Original change's description:
> > cros: Add tablet <-> clamshell performance test.
> >
> > Test: interactive_ui_tests TabletModeTransitionTest.EnterExit
> > Bug: 953896
> > Change-Id: Ie2332df2bea2f7d2a63b39d8b390fcf4b28999f8
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1580583
> > Commit-Queue: Sammie Quon <sammiequon@chromium.org>
> > Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#656911}
>
> Bug: 953896
> Change-Id: I214d12fc24f16423f323c87fa7a182eebb0ee745
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1598784
> Commit-Queue: Sammie Quon <sammiequon@chromium.org>
> Reviewed-by: Mitsuru Oshima (slow - gardening) <oshima@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#658294}

Bug: 953896
Change-Id: Ifce43db563c6901a7095d4b8137e041f74cca8e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1606761Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658817}