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When a surface is both always on top and pinned there is a bad
interaction between ScreenPinningController and AlwaysOnTopController.
AlwaysOnTopController will attempt to reparent a window that
ScreenPinningController is positioning, causing a crash. Prevent this
using AlwaysOnTopController::SetDisallowReparent.

Bug: 980366
Change-Id: I99f86d43fa6092b4d6c1729de1c983178c76eb6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1701313
Commit-Queue: Fergus Dall <sidereal@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678544}