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A recent bug [1] showed that in SkiaRenderer, it was possible for a
backdrop-filter element to blend pixels from a neighboring (but not
underlapping) render pass, due to some clipping issues. This test
checks for this situation.

The original bug was fixed in [2], but I verified that this test
breaks pre-[2] (see patchset 1 of this CL).

[1] https://crbug.com/1162743
[2] https://chromium-review.googlesource.com/c/chromium/src/+/2611452

Bug: 1162743
Change-Id: I86d00d9831057ace40476d29848c11ba1b671a82
Fixed: 1165868
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625156
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843000}