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Fixes issue where occlusion tracking could start sending
updates before the surface state had been committed. In
ARC, this meant that occlusion updates were sent before
the surface bounds were first set, leading to incorrect
"full occlusion (1.0f) updates".

Bug: b:149229321
Test: exo_unittests
Change-Id: Ia885a44cf38658cc82d87273f70395c8bc2fcf72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212921
Commit-Queue: Jorge Gil <jorgegil@google.com>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Eliot Courtney <edcourtney@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771850}