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In the linked bug, we cut a hole in the background that is occluded
by the foreground app folder. This hole changes the background blur
and we see that around the foreground occluder there is less blur.

Bug: 1059734
Test: DisplayTest.DrawOcclusionWithIntersectingBackdropFilter
Change-Id: I665b483ed4bede53b9e4640962a3ccf8d16de3fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2097512
Commit-Queue: Sasha McIntosh <sashamcintosh@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753599}