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In the case that the element with backdrop-filter also has
opacity set to zero, there is no need to perform the backdrop
filtering operation. This also avoids degradation of the painted
output when backdrop_filter_quality is < 1 and opacity is 0,
as in crbug.com/1002225.

Bug: 1002225
Change-Id: I8334f6cc46f18eeda412cab7b885b1612c0315a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1833925
Commit-Queue: vmpstr <vmpstr@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702023}