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This fixes the case where the occlusion is changed while we are updating all the
pending properties. This caused some wrong occlusion updates.

Bug: 140563748
Test: Spurious occlusion update no longer occurs when leaving PIP.
Change-Id: Ic9bdbf62c655285eb8fbe1c80d221ff95bbbd096
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1794526
Commit-Queue: Stefan Kuhne <skuhne@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695323}