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Before the use of _NET_WM_STATE was common, windows would expect to be
maximized on launch if their size was larger than the display working
area. See
https://github.com/linuxmint/muffin/blob/f5778ba1433c3ac86f5aeb8fa7443baf600eb9db/src/core/place.c#L977

This change emultes that behaviour for CrOS. We add a callback in
widget initialization that we use to check the window size against
the display area, and maximize if necessary.

Bug: 994009
Change-Id: I0e6409a4c28eb9ea5071461c736a6fbf44f56606
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1788420
Commit-Queue: Nic Hollingum <hollingum@google.com>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701025}