external/wpt/css/css-transforms/transform-input-015.html is failing due
to anti-aliasing. Fix this issue by using fuzzy matching on 2 pixels.

Bug: 1051143
Change-Id: Ie60f02f95bcdaee7c26884c1dd2ec128df60f014
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2844766
Reviewed-by: Olga Gerchikov <[email protected]>
Reviewed-by: Philip Rogers <[email protected]>
Commit-Queue: Sahir Vellani <[email protected]>
Cr-Commit-Position: refs/heads/master@{#875355}