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Currently a wl_surface is in a 1:1 relationship with WaylandWindow. To
get wayland subsurface forwarding, fields that are 1:1 to wl_surface
should be grouped and moved out of WaylandWindow. In the future,
WaylandWindow can have 1 to many relationship with wl_surfaces, some of
which are assigned wl_subsurface role.

A new WaylandSurface class is created. Original WaylandSurface is now
renamed to WaylandToplevelWindow.

Bug: 1063865
Change-Id: I23feed2a98329e3c0cc5067065af6e7dd1b2e4b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2261252Reviewed-by: Maksim Sisov <msisov@igalia.com>
Commit-Queue: Kramer Ge <fangzhoug@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782022}