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This change fixes a couple of incorrect assumptions we were making with
respect to the behaviour of transaction acks on SurfaceControl.

TBR=nyquist@chromium.org
R=piman@chromium.org

Change-Id: I4c1997997c158e99eca17b013ed9db8d9776ef1b
Bug: 942614
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1526638
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Auto-Submit: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641683}