This test have been flaky for quite a long time:

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=performance_test_suite&tests=system_health.memory_desktop%2Flong_running%3Atools%3Agmail-background

Log: https://console.developers.google.com/m/cloudstorage/b/chrome-telemetry-output/o/435737a8-941b-11e8-8f20-509a4c656174

(ERROR) 2018-07-30 09:44:55,033 story_runner.ProcessError:100  Handleable error. Will try to restart shared state
Traceback (most recent call last):
  File "/b/s/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py", line 125, in _RunStoryAndProcessErrorIfNeeded
    state.RunStory(results)
  File "/b/s/w/ir/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 75, in traced_function
    return func(*args, **kwargs)
  File "/b/s/w/ir/third_party/catapult/telemetry/telemetry/page/shared_page_state.py", line 310, in RunStory
    self._current_page.Run(self)
  File "/b/s/w/ir/third_party/catapult/telemetry/telemetry/page/__init__.py", line 99, in Run
    self.RunPageInteractions(action_runner)
  File "/b/s/w/ir/tools/perf/page_sets/system_health/long_running_stories.py", line 29, in RunPageInteractions
    action_runner.MeasureMemory()
  File "/b/s/w/ir/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 75, in traced_function
    return func(*args, **kwargs)
  File "/b/s/w/ir/third_party/catapult/telemetry/telemetry/internal/actions/action_runner.py", line 162, in MeasureMemory
    raise exceptions.StoryActionError('Unable to obtain memory dump')
StoryActionError: Unable to obtain memory dump
(INFO) 2018-07-30 09:44:55,034 browser.DumpStateUponFailure:346  *************** BROWSER STANDARD OUTPUT ***************
(INFO) 2018-07-30 09:44:55,034 browser.DumpStateUponFailure:348  [26917:26917:0730/094324.697168:ERROR:browser_dm_token_storage_linux.cc(93)] Error: /etc/machine-id contains 32 characters (32 were expected).
Fontconfig warning: "/etc/fonts/fonts.conf", line 86: unknown element "blank"


I will disable this test on Linux platform due to it has been being flaky for a long time.