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Previous to this CL, the location of the backdrop filter bounds
rect was incorrect when the containing layer was clipped by the
viewport. In that case, the offset added to the backdrop filter
bounds transform did not account for the clip. It now does, which
should fix at least four bugs.

Bug: 618913, 927097, 932160, 940917
Change-Id: I0dc1e4c3dde61210d8f7aa78b2e20f13fc8a2471
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1602812
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658920}