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This CL turns ShellSurfaceBase::OnSurfaceCommit into a template method
to isolate logic for ShellSurface and ClientControlledShellSurface.

Bug: b:77972398
Test: exo_unittests
Change-Id: Iad359c3754f9955fd34ea372a06e6d53999b8877
Reviewed-on: https://chromium-review.googlesource.com/1176182Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Dominik Laskowski <domlaskowski@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583436}