v8.runtimestats.browsing_mobile/browse:social:facebook in v8.runtimestats.browsing_mobile failing on chromium.perf/Android One Perf

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

Looks like there are multiple chrome processes happening here?

Traceback (most recent call last):
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py", line 98, in _RunStoryAndProcessErrorIfNeeded
    state.WillRunStory(story)
  File "/b/swarming/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/swarming/w/ir/third_party/catapult/telemetry/telemetry/page/shared_page_state.py", line 248, in WillRunStory
    self._StartBrowser(page)
  File "/b/swarming/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/swarming/w/ir/third_party/catapult/telemetry/telemetry/page/shared_page_state.py", line 209, in _StartBrowser
    self._browser = self._possible_browser.Create(finder_options_for_page)
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/backends/chrome/android_browser_finder.py", line 136, in Create
    browser_backend, self._platform_backend, self._credentials_path)
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/browser/browser.py", line 60, in __init__
    self._LogBrowserInfo()
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/browser/browser.py", line 117, in _LogBrowserInfo
    logging.info('Browser started (pid=%s).', self._browser_backend.pid)
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py", line 236, in pid
    '%s' % (self._backend_settings.package, pids))
Exception: At most one instance of process org.chromium.chrome expected but found pids: defaultdict(<type 'list'>, {'org.chromium.chrome:sandboxed_process0': ['4123'], 'org.chromium.chrome': ['4092', '4162']})
(INFO) 2017-11-13 20:34:47,556 exception_formatter.PrintFormattedException:19  Try printing formatted exception: None None None
Exception raised when cleaning story run: 
Traceback (most recent call last):
  _RunStoryAndProcessErrorIfNeeded at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py:130
    test.DidRunStory(state.platform, results)
  DidRunStory at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/web_perf/timeline_based_measurement.py:290
    trace_result, _ = platform.tracing_controller.StopTracing()
  StopTracing at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/core/tracing_controller.py:53
    return self._tracing_controller_backend.StopTracing()
  StopTracing at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/platform/tracing_controller_backend.py:109
    self._IssueClockSyncMarker()
  _IssueClockSyncMarker at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/platform/tracing_controller_backend.py:215
    self._RecordIssuerClockSyncMarker)
  RecordClockSyncMarker at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/platform/tracing_agent/chrome_tracing_agent.py:178
    raise ChromeClockSyncError('Cannot issue clock sync. No devtools clients')
ChromeClockSyncError: Cannot issue clock sync. No devtools clients
Locals:
  devtools_clients                             : []
  record_controller_clock_sync_marker_callback : <bound method TracingControllerBackend._RecordIssuerClockSyncMarker of <telemetry.internal.platform.tracing_controller_backend.TracingControllerBackend object at 0x7f847b9be510>>
  sync_id                                      : '884bb565-9062-4ee2-9d00-68d6a93d3c14'
[  FAILED  ] browse:social:facebook@{'case': 'browse', 'group': 'social'} (11578 ms)
(INFO) 2017-11-13 20:34:47,599 cmd_helper._ValidateAndLogCommand:160  [host]> /b/swarming/w/ir/third_party/catapult/devil/bin/deps/linux2/x86_64/forwarder_host --adb=/b/swarming/w/ir/third_party/catapult/devil/bin/deps/linux2/x86_64/bin/adb --serial-id=AG86044200A08GC --unmap 47808
(INFO) 2017-11-13 20:34:47,614 exception_formatter.PrintFormattedException:19  Try printing formatted exception: None None None
Traceback (most recent call last):
  RunBenchmark at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py:339
    max_num_values=benchmark.MAX_NUM_VALUES)
  Run at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py:203
    _RunStoryAndProcessErrorIfNeeded(story, results, state, test)
  _RunStoryAndProcessErrorIfNeeded at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py:98
    state.WillRunStory(story)
  traced_function at /b/swarming/w/ir/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py:75
    return func(*args, **kwargs)
  WillRunStory at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/page/shared_page_state.py:248
    self._StartBrowser(page)
  traced_function at /b/swarming/w/ir/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py:75
    return func(*args, **kwargs)
  _StartBrowser at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/page/shared_page_state.py:209
    self._browser = self._possible_browser.Create(finder_options_for_page)
  Create at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/backends/chrome/android_browser_finder.py:136
    browser_backend, self._platform_backend, self._credentials_path)
  __init__ at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/browser/browser.py:60
    self._LogBrowserInfo()
  _LogBrowserInfo at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/browser/browser.py:117
    logging.info('Browser started (pid=%s).', self._browser_backend.pid)
  pid at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/backends/chrome/android_browser_backend.py:236
    '%s' % (self._backend_settings.package, pids))
Exception: At most one instance of process org.chromium.chrome expected but found pids: defaultdict(<type 'list'>, {'org.chromium.chrome:sandboxed_process0': ['4123'], 'org.chromium.chrome': ['4092', '4162']})