On this build:

https://uberchromegw.corp.google.com/i/chromium.gpu/builders/Mac%20Release%20%28Intel%29/builds/73056

these tests failed like so:

AssertionError: Color mismatch at (10, 0): expected (45, 222, 36), got (40, 217, 33)

I assume this is a real test failure, since the expected colors are quite close to the real ones.

ccameron@, what do you make of this?