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This is a reland of fac39a19

Original change's description:
> overview: Fixed aspect ratio for overview items in splitview.
> 
> Overview items now match the aspect ratio of the window bounds if they
> get snapped. This will happen if splitview is active on either side, or
> if the window is getting dragged close enough to an edge. A videos of
> before and after this patch is in the bug.
> 
> Follow up:
> Make this work for tablet mode with 6 or more windows. In that case
> the positioning logic follows a different path.
> Match the exact dimensions in the spec, this patch only does rough
> clipping.
> 
> Test: added tests, manual
> Bug: 1011973
> Change-Id: I3d9d341c54b58d0e86440045ad1408ca3a0fd27d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849175
> Commit-Queue: Sammie Quon <sammiequon@chromium.org>
> Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#707426}

Bug: 1011973
Change-Id: I6ff9ce5c4ecebf2a2006abd26821c5c12b82e5e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872453Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707876}