GitLab

* Pause occusion tracker during overview animation
* Activate the text filter after animation
* Don't animate backdrop window during overview animation.
* Fix the bounds change issue in WindowGrid. It shouldn't change
the parent window's bounds.

  in both clamshell and tabletmode.
  The web contents should load after animations without backdrop animation.
  No gap at the bottom of the screen after exiting overview mode.

Bug: 898077, 897387
Test: no functional change. Manually tested visual change by entering/exiting overview mode
Change-Id: I60c2709c5394a565bae6d0c4bfdd7006e2e76496
Reviewed-on: https://chromium-review.googlesource.com/c/1304973
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604206}