Add TestExpectation for fast/overflow/clip-rects-fixed-ancestor.html

TBR=chrishtr@chromium.org

Bug: 921242
Change-Id: Ifa915bc86e5148d5df71a744ef6f41c00881115f
Reviewed-on: https://chromium-review.googlesource.com/c/1429881
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625146}
1 file changed