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This is a reland of fc2d77d5

TBR=oshima@chromium.org

Original change's description:
> overivew: Animate blur when there are no maximized windows.
>
> See bug(s) for spec. This CL adds an animated blur on wallpaper when entering/existing
> overview when no maximized/fullscreen windows.
>
> Bug: 823533, 812004
> Change-Id: Icf8bdababedaaefe869f62768aacf7abcb3643d2
> Reviewed-on: https://chromium-review.googlesource.com/979167
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
> Commit-Queue: Sammie Quon <sammiequon@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#549780}

Bug: 823533, 812004
Change-Id: I3aa8ded00f07209108f144bddfa401a35d90ff2d
Reviewed-on: https://chromium-review.googlesource.com/1007742Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550422}