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The first usage will be full screen applist, so it doesnt show up while
overview windows are moving around.

Also move blur to after animations, and fix a bug with app list overview
animation pause, and add a pause for homecher -> overview window
animations.

Test: manual
Bug: 873394, 871875, 880613
Change-Id: Id9ede4b412c609cff6a1ec4c841b20aaab9aa5e2
Reviewed-on: https://chromium-review.googlesource.com/1199814Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Weidong Guo <weidongg@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589186}