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WaylandWindow handles too many things and confuses developers that
are not familiar with it. To make things better, extract
surface methods into WaylandSurface.

This change does not bring any functional changes except removed
is_active() method that was only used by tests. Instead, tests
just rely on the PlatformWindowDelegate::OnActivationChanged calls.

Test: ozone_unittests
Bug: 1028919
Change-Id: Ia58577f86d8e31ec93b113d887b34166fbe19cf0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1954478
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722592}