The fast/canvas/canvas-composite-text-alpha.html layout test is flaky on GTK+. It fails very ocasionally When it fails the diff is the following: https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20%28Tests%29/r183008%20%287814%29/fast/canvas/canvas-composite-text-alpha-pretty-diff.html
The test(s) filed under this bug have been consistently passing for the last 4000 revisions. Marking bug as fixed. Committed r263254: <https://trac.webkit.org/changeset/263254>
<rdar://problem/64522488>