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Since crrev.com/c/1955818 all exo widgets (i.e. windows with a title
bar, close buttons, etc) are defaulted to Arc++. This caused many
crostini windows, which previously had no association, to be considered
as Arc++ apps. This causes the Arc++ IME to steal events when there
happens to be (or ever have been) an active input field in an arc++ app
anywhere.

We move the code that sets Arc++ windows to
ClientControlledShellSurface, which Arc++ apps use.

Bug: 1069388
Change-Id: If559a68315c2dcf175023f6601bdaf8bb6de46ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2306499
Commit-Queue: Nic Hollingum <hollingum@google.com>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798539}