These four: fast/canvas/canvas-createPattern-fillRect-shadow.html fast/canvas/canvas-draw-canvas-on-canvas-shadow.html fast/canvas/canvas-fillRect-gradient-shadow.html fast/canvas/set-colors.html Since they're flaky, I can't check in expected failing results, so I will skip them.
<rdar://problem/11078302>
Skipped in http://trac.webkit.org/changeset/111278
Adding one more to that list: canvas/philip/tests/2d.path.arc.scale.1.html
Some of these tests are not flaky on bots now, and some fail every time on all Mac bots. I can't check "locally" for everyone, but I'm going to unmark the tests and claim that the flakiness is gone.
Actually, all of them pass on bots 100% - the ones that were failing just had incorrect results checked in to platform/mac.