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It was double counting because it recorded one visible desk change per
root window. This CL keeps the same logic, but moves it to
DeskActivationAnimation, so that the metric is only counted once.

Also, extend the time fast forward in a flaky test.

Bug: 1151856
Test: manual
Change-Id: Ica101a25df867ce5b37bfce08699c2d4715a9230
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587974Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839035}