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Sometimes windows can be very long or very tall outside of overview
mode. These windows will either become super wide or super skinny after
entering overvie wmode. This is not ideal as too wide -> takes up too
much space and too skinny -> users cannot see the title.

Clamps the width to be within 0.5 and 2 times the height. Windows will
still keep their aspect ratio, so the resulting window is centered in
the window selector item.

https://screenshot.googleplex.com/dSfEciJ5CPd
The above screenshot shows the effect of this CL (minus the blue and
red borders which help visualize). The extreme windows will look they
are floating since the backdrop is not implemented yet. But this cl is all
behind a switch.

Test: ash_unittests WindowSelectorTest.ExtremeWindowBounds
Bug: 782320
Change-Id: Id337eb091fcc4f1297ae8f864175c7f06b10b71c
Reviewed-on: https://chromium-review.googlesource.com/869051
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532029}