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When context menus are created (with right-click or long touch
press), WaylandWindow must take a focused window as a parent for
that context aka popup window. It has always been so for mouse clicks, but
not for touches.

Now, GetCurrentFocusedWindow returns either a window with
pointer focus or touch focus.

Also fix unittests and their expectations

Bug: 973015
Change-Id: I3c268f3956d57fd673c5e7a8646a30fdd4c921a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715078
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681708}