media.android.tough_video_cases_tbmv2 failing on chromium.perf/Android One Perf

Builders failed on: 
- Android One Perf: 
  https://build.chromium.org/p/chromium.perf/builders/Android%20One%20Perf


Traceback (most recent call last):
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py", line 97, in _RunStoryAndProcessErrorIfNeeded
    test.WillRunStory(state.platform)
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/web_perf/timeline_based_measurement.py", line 276, in WillRunStory
    platform.tracing_controller.StartTracing(self._tbm_options.config)
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/core/tracing_controller.py", line 43, in StartTracing
    self._tracing_controller_backend.StartTracing(tracing_config, timeout)
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/platform/tracing_controller_backend.py", line 91, in StartTracing
    started = agent.StartAgentTracing(config, timeout)
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/platform/tracing_agent/battor_tracing_agent.py", line 73, in StartAgentTracing
    self._battor.StartTracing()
  File "/b/swarming/w/ir/third_party/catapult/common/battor/battor/battor_wrapper.py", line 235, in StartTracing
    self._SendBattOrCommand(self._START_TRACING_CMD)
  File "/b/swarming/w/ir/third_party/catapult/common/battor/battor/battor_wrapper.py", line 359, in _SendBattOrCommand
    'Outputted: %s' % (cmd, status))
BattOrError: BattOr did not complete command 'StartTracing' correctly.
Outputted: [0924/234313.589678:ERROR:serial_io_handler.cc(149)] Failed to open serial port: FILE_ERROR_ACCESS_DENIED


+charliea in case he's familiar with the error