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Wayland does not provide either location of surfaces in global space
coordinate system or location of a pointer. Instead, only locations of
mouse/touch events are known. Given that Chromium assumes top-level windows
are located at origin, always provide a cursor point in regards to
surfaces' location.

If a pointer is located in any of the existing wayland windows, return the
last known cursor position. Otherwise, return such a point, which is not
contained by any of the windows.

Bug: 875161
Change-Id: If4de9936502efb6c49a50fe125f3fd6f5c59a4d0
Reviewed-on: https://chromium-review.googlesource.com/c/1273295
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628264}