https://pinpoint-dot-chromeperf.appspot.com/job/12fa05d0e40000 failed because the test bot failed:

Traceback (most recent call last):
  File "/base/data/home/apps/s~chromeperf/pinpoint:clean-dtu-6f7c60dd.412716951395069884/dashboard/pinpoint/models/quest/execution.py", line 95, in Poll
    self._Poll()
  File "/base/data/home/apps/s~chromeperf/pinpoint:clean-dtu-6f7c60dd.412716951395069884/dashboard/pinpoint/models/quest/run_test.py", line 203, in _Poll
    'message was:\n%s' % exception_string)
SwarmingTestError: The test failed. The test's error message was:
ImportError: No module named mock

It seems that bots need to install some dependencies.