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wl_surface.commits of a frame can happen asynchronously due to wl_buffer
import delay, frame callbacks, etc. This asynchrony can cause visual
glitches when the root_surface commits before its subsurfaces commit.

This CL ensures that a root_surface commit always happens after other
commits in a frame.

Change-Id: I7c83e122c4cdee42e6b8aca74875fa71b6c1ab5a
Bug: 1144179
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547395
Commit-Queue: Kramer Ge <fangzhoug@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Maksim Sisov (GMT+2) <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#834327}