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The handler of configure surface events didn't take whether the window
had normal state when responding to zero width and height passed by the
compositor.  This resulted in unnecessary restoring of window size
when it should remain maximized of expanded to full screen.

This CL fixes the behaviour and improves the test to cover the scenario
explained above.

R=msisov@igalia.com

Bug: 934686
Change-Id: I4dd7e01484ccea663f0e0012288d6de70e48ad06
Reviewed-on: https://chromium-review.googlesource.com/c/1489195
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Reviewed-by: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#636757}