dromaeo.jslibstylejquery failing on 4 builders



Builders failed on: 
- Android Nexus5X Perf (2): 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus5X%20Perf%20%282%29
- Android Nexus6 Perf (2): 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus6%20Perf%20%282%29
- Android Nexus6 WebView Perf (1): 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus6%20WebView%20Perf%20%281%29
- Android Nexus7v2 Perf (2): 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus7v2%20Perf%20%282%29


Log: https://luci-logdog.appspot.com/v/?s=chrome%2Fbb%2Fchromium.perf%2FAndroid_Nexus5X_Perf__2_%2F3232%2F%2B%2Frecipes%2Fsteps%2Fdromaeo.jslibstylejquery%2F0%2Fstdout

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Traceback (most recent call last):
  RunBenchmark at /b/c/b/Android_Nexus5X_Perf__2_/src/third_party/catapult/telemetry/telemetry/internal/story_runner.py:364
    benchmark.ShouldTearDownStateAfterEachStorySetRun())
  Run at /b/c/b/Android_Nexus5X_Perf__2_/src/third_party/catapult/telemetry/telemetry/internal/story_runner.py:243
    _RunStoryAndProcessErrorIfNeeded(story, results, state, test)
  _RunStoryAndProcessErrorIfNeeded at /b/c/b/Android_Nexus5X_Perf__2_/src/third_party/catapult/telemetry/telemetry/internal/story_runner.py:88
    state.RunStory(results)
  traced_function at /b/c/b/Android_Nexus5X_Perf__2_/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py:52
    return func(*args, **kwargs)
  RunStory at /b/c/b/Android_Nexus5X_Perf__2_/src/third_party/catapult/telemetry/telemetry/page/shared_page_state.py:301
    self._current_page, self._current_tab, results)
  traced_function at /b/c/b/Android_Nexus5X_Perf__2_/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py:52
    return func(*args, **kwargs)
  ValidateAndMeasurePage at /b/c/b/Android_Nexus5X_Perf__2_/src/tools/perf/benchmarks/dromaeo.py:62
    self._power_metric.Stop(page, tab)
  Stop at /b/c/b/Android_Nexus5X_Perf__2_/src/tools/perf/metrics/power.py:100
    self._StopInternal()
  _StopInternal at /b/c/b/Android_Nexus5X_Perf__2_/src/tools/perf/metrics/power.py:52
    self._results = self._platform.StopMonitoringPower()
  StopMonitoringPower at /b/c/b/Android_Nexus5X_Perf__2_/src/third_party/catapult/telemetry/telemetry/core/platform.py:311
    ret_val = self._platform_backend.StopMonitoringPower()
  StopMonitoringPower at /b/c/b/Android_Nexus5X_Perf__2_/src/third_party/catapult/telemetry/telemetry/internal/platform/android_platform_backend.py:433
    return self._power_monitor.StopMonitoringPower()
  StopMonitoringPower at /b/c/b/Android_Nexus5X_Perf__2_/src/third_party/catapult/telemetry/telemetry/internal/platform/power_monitor/android_power_monitor_controller.py:79
    self._MergePowerResults(results, monitor.StopMonitoringPower())
  StopMonitoringPower at /b/c/b/Android_Nexus5X_Perf__2_/src/third_party/catapult/telemetry/telemetry/internal/platform/power_monitor/sysfs_power_monitor.py:76
    self._platform.ParseCStateSample(self._initial_cstate),
  ParseCStateSample at /b/c/b/Android_Nexus5X_Perf__2_/src/third_party/catapult/telemetry/telemetry/internal/platform/android_platform_backend.py:497
    cstates[state] = int(times[i])
ValueError: invalid literal for int() with base 10: ''
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