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If the surface is a synchronized subsurface, wl_surface.commit on
a sub-surface will accumulate the committed state in a cache, but
the state will not be applied until a parent surface commit.

Reference: https://github.com/wayland-project/wayland/blob/master/protocol/wayland.xml#L2834

Bug: 1123921
Change-Id: I32396bb087db1e06262deca2611615d9f89c930e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382057Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: Kramer Ge <fangzhoug@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821318}