Same thing on Mac10.9:
https://uberchromegw.corp.google.com/i/chromium.mac/builders/Mac10.9%20Tests

[323/535] telemetry.testing.browser_test_runner_unittest.BrowserTestRunnerTest.testJsonOutputFormatPositiveFilter queued[1/2] browser_tests.simple_numeric_test.SimpleTest.TestException failed unexpectedly 0.0004s:
  Traceback (most recent call last):
    File "/b/s/w/irgittn0/third_party/catapult/telemetry/examples/browser_tests/simple_numeric_test.py", line 76, in TestException
      raise Exception('Expected exception')
  Exception: Expected exception
[2/2] browser_tests.simple_numeric_test.SimpleTest.TestSimple failed unexpectedly 0.5106s:
  Traceback (most recent call last):
    File "/b/s/w/irgittn0/third_party/catapult/telemetry/examples/browser_tests/simple_numeric_test.py", line 73, in TestSimple
      self.assertEqual(1, self.extra)
  AssertionError: 1 != 5
2 tests run in 0.5s, 2 failures.

[324/535] telemetry.testing.browser_test_runner_unittest.BrowserTestRunnerTest.testJsonOutputFormatPositiveFilter passed 1.2799s
[324/535] telemetry.testing.browser_test_runner_unittest.BrowserTestRunnerTest.testJsonOutputWhenTearDownClassFailed queued[1/3] browser_tests.failed_tests.TearDownClassFailedTest.dummy_test_0 failed unexpectedly 0.0006s:
  Traceback (most recent call last):
    File "/b/s/w/irgittn0/third_party/catapult/telemetry/examples/browser_tests/failed_tests.py", line 32, in tearDownClass
      raise Exception
  Exception
[2/3] browser_tests.failed_tests.TearDownClassFailedTest.dummy_test_1 failed unexpectedly 0.0004s:
  Traceback (most recent call last):
    File "/b/s/w/irgittn0/third_party/catapult/telemetry/examples/browser_tests/failed_tests.py", line 32, in tearDownClass
      raise Exception
  Exception
[3/3] browser_tests.failed_tests.TearDownClassFailedTest.dummy_test_2 failed unexpectedly 0.0003s:
  Traceback (most recent call last):
    File "/b/s/w/irgittn0/third_party/catapult/telemetry/examples/browser_tests/failed_tests.py", line 32, in tearDownClass
      raise Exception
  Exception
3 tests run in 0.0s, 3 failures.

  Traceback (most recent call last):
    File "/b/swarm_slave/w/ir50EURG/third_party/catapult/telemetry/telemetry/testing/browser_test_case.py", line 41, in WrappedMethod
      method(self)
    File "/b/swarm_slave/w/ir50EURG/third_party/catapult/telemetry/telemetry/core/tracing_controller_unittest.py", line 187, in testBattOrTracing
      trace_data.HasTracesFor(trace_data_module.BATTOR_TRACE_PART))
  AssertionError: False is not true

It looks like the Battors are unhappy?

On the 10.11 I'm seeing:

Couldn't find an application named "../../out/Release/Chromium.app/Contents/MacOS/Chromium"; defaults unchanged

Traceback (most recent call last):
  <module> at /b/s/w/irPurYg_/third_party/catapult/telemetry/telemetry/testing/run_tests.py:302
    ret_code = RunTestsCommand.main()
  main at /b/s/w/irPurYg_/third_party/catapult/telemetry/telemetry/testing/run_tests.py:123
    return obj.Run(options)
  Run at /b/s/w/irPurYg_/third_party/catapult/telemetry/telemetry/testing/run_tests.py:195
    ret, _, _ = runner.run()
  run at /b/s/w/irPurYg_/third_party/catapult/third_party/typ/typ/runner.py:178
    ret, full_results = self._run_tests(result_set, test_set)
  _run_tests at /b/s/w/irPurYg_/third_party/catapult/third_party/typ/typ/runner.py:438
    self._run_one_set(self.stats, result_set, test_set)
  _run_one_set at /b/s/w/irPurYg_/third_party/catapult/third_party/typ/typ/runner.py:481
    test_set.parallel_tests, self.args.jobs)
  _run_list at /b/s/w/irPurYg_/third_party/catapult/third_party/typ/typ/runner.py:519
    result = pool.get()
  get at /b/s/w/irPurYg_/third_party/catapult/third_party/typ/typ/pool.py:195
    return self.callback(self.context_after_pre, self.msgs.pop(0))
  _run_one_test at /b/s/w/irPurYg_/third_party/catapult/third_party/typ/typ/runner.py:870
    err, child.worker_num, pid)
  _result_from_test_result at /b/s/w/irPurYg_/third_party/catapult/third_party/typ/typ/runner.py:898
    err = err + test_result.errors[0][1]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 5201: ordinal not in range(128)

yeah, I saw that. That's why I decided to involve troopers.

+Dirk for the typ's problem: I remembered filing about this?

Downgrade the priority because this is no longer happening.

-Troopers since it's no longer happening.