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When dragging a maximized window, the window may resize. We try to
position the window so that the ratio between origin and event
location and width remains equal.

The caption buttons have the same size even if the window shrinks
though, so if the original click was near the caption buttons, the
ratio result may end up on top of the caption buttons. This CL
addresses them by checking the position of the caption and shifting
the new window bounds such that the mouse will not be on top of the
caption buttons.

This won't have an effect on custom headers, as theres no way to
determine how large their caption area is.

Test: manual
Change-Id: I15b235dae773fe90283ffabf9daff0e4ac984e24
Fixed: 1082839
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2238415Reviewed-by: Mitsuru Oshima (slow:gardening) <oshima@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779874}