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filter-repaint-blur.html, filter-repaint-child-layers.html, and
filter-repaint.html have minor visual differences due to blur, so add
them to crbug.com/972621.

Bug: 954328
Change-Id: I058282af69291f89205bc583e005b3a5cddb6352
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1756715
Commit-Queue: Sean Gilhuly <sgilhuly@chromium.org>
Reviewed-by: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688088}