Here's stdio (https://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_rel_ng/builds/253427):

  Traceback (most recent call last):
    File "e:\b\swarm_slave\w\irnuarnr\third_party\catapult\telemetry\telemetry\testing\browser_test_case.py", line 41, in WrappedMethod
      method(self)
    File "e:\b\swarm_slave\w\irnuarnr\tools\perf\core\about_tracing_integration_test.py", line 32, in testBasicTraceRecording
      action_runner.WaitForElement(selector='div[title~="Browser"]')
    File "e:\b\swarm_slave\w\irnuarnr\third_party\catapult\telemetry\telemetry\internal\actions\action_runner.py", line 206, in WaitForElement
      timeout_in_seconds=timeout_in_seconds))
    File "e:\b\swarm_slave\w\irnuarnr\third_party\catapult\telemetry\telemetry\internal\actions\action_runner.py", line 45, in _RunAction
      action.RunAction(self._tab)
    File "e:\b\swarm_slave\w\irnuarnr\third_party\catapult\telemetry\telemetry\internal\actions\wait.py", line 22, in RunAction
      wait=True, timeout_in_seconds=self.timeout_in_seconds)
    File "e:\b\swarm_slave\w\irnuarnr\third_party\catapult\telemetry\telemetry\internal\actions\page_action.py", line 113, in EvaluateCallbackWithElement
      tab.WaitForJavaScriptExpression(code, timeout_in_seconds)
    File "e:\b\swarm_slave\w\irnuarnr\third_party\catapult\telemetry\telemetry\internal\browser\web_contents.py", line 136, in WaitForJavaScriptExpression
      e.message + '\n' + debug_message)
  TimeoutException: Timed out while waiting 60s for IsJavaScriptExpressionTrue.