GitLab

To hide future different types of WaylandWindows (WaylandSurface,
WaylandPopup and WaylandSubsurface), add a factory method, which
will handle everything on its own.

Also make unittests and OzonePlatformWayland use this factory.

Bug: 1028919
Change-Id: I745f99024b6657be3686ee92b0baf4c93f08b9a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1954470
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722586}