The failure started with build: https://build.chromium.org/p/chromium.gpu.fyi/builders/Mac%20Experimental%20Retina%20Release%20%28NVIDIA%29/builds/2592. There are only 3 changes in this build and its clearly coming from https://chromium.googlesource.com/chromium/src/+/bb354ab52392a11204cd3fc2d443d6ba5cbb87ed

Here is a log from the test:   Traceback (most recent call last):
    File "/b/c/b/Mac_Experimental_Retina_Release__NVIDIA_/ir/third_party/catapult/telemetry/telemetry/testing/serially_executed_browser_test_case.py", line 194, in <lambda>
      return lambda self: based_method(self, *args)
    File "/b/c/b/Mac_Experimental_Retina_Release__NVIDIA_/ir/content/test/gpu/gpu_tests/gpu_integration_test.py", line 125, in _RunGpuTest
      self.RunActualGpuTest(url, *args)
    File "/b/c/b/Mac_Experimental_Retina_Release__NVIDIA_/ir/content/test/gpu/gpu_tests/hardware_accelerated_feature_integration_test.py", line 75, in RunActualGpuTest
      self.fail('%s not hardware accelerated' % feature)
  AssertionError: Canvas not hardware accelerated

The patch disables hardware accelerated canvas on this config, which is what the test is verifying. ericrk@, could you take a look and confirm, and disable the test. In that case, please also file a bug to re-enable the test, blocked on re-enabling GPU raster/canvas on this config. Thanks!