Stories failing:

- browse:social:facebook
- browse:media:imgur

On at least the following bots:

- Android Nexus5 Perf (2)
- Android Nexus5X Perf (2)
- Android Nexus5X WebView Perf (2)
- Android Nexus6 WebView Perf (1)
- Android Nexus7v2 Perf (2)

Sample Python traceback:

Traceback (most recent call last):
  File "/b/rr/tmpLlosmu/w/src/third_party/catapult/telemetry/telemetry/internal/story_runner.py", line 87, in _RunStoryAndProcessErrorIfNeeded
    state.RunStory(results)
  File "/b/rr/tmpLlosmu/w/src/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/rr/tmpLlosmu/w/src/third_party/catapult/telemetry/telemetry/page/shared_page_state.py", line 299, in RunStory
    self._current_page.Run(self)
  File "/b/rr/tmpLlosmu/w/src/third_party/catapult/telemetry/telemetry/page/__init__.py", line 109, in Run
    self.RunPageInteractions(action_runner)
  File "/b/rr/tmpLlosmu/w/src/tools/perf/page_sets/system_health/system_health_story.py", line 112, in RunPageInteractions
    self._DidLoadDocument(action_runner)
  File "/b/rr/tmpLlosmu/w/src/tools/perf/page_sets/system_health/browsing_stories.py", line 247, in _DidLoadDocument
    self._NavigateToItem(action_runner, index)
  File "/b/rr/tmpLlosmu/w/src/tools/perf/page_sets/system_health/browsing_stories.py", line 33, in _NavigateToItem
    action_runner.ScrollPageToElement(element_function=item_selector)
  File "/b/rr/tmpLlosmu/w/src/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/rr/tmpLlosmu/w/src/third_party/catapult/telemetry/telemetry/internal/actions/action_runner.py", line 429, in ScrollPageToElement
    speed_in_pixels_per_second=speed_in_pixels_per_second))
  File "/b/rr/tmpLlosmu/w/src/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/rr/tmpLlosmu/w/src/third_party/catapult/telemetry/telemetry/internal/actions/action_runner.py", line 54, in _RunAction
    action.WillRunAction(self._tab)
  File "/b/rr/tmpLlosmu/w/src/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/rr/tmpLlosmu/w/src/third_party/catapult/telemetry/telemetry/internal/actions/scroll_to_element.py", line 54, in WillRunAction
    self._distance = tab.EvaluateJavaScript(get_distance_js)
  File "/b/rr/tmpLlosmu/w/src/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/rr/tmpLlosmu/w/src/third_party/catapult/telemetry/telemetry/internal/browser/web_contents.py", line 193, in EvaluateJavaScript
    expr, context_id=None, timeout=timeout)
  File "/b/rr/tmpLlosmu/w/src/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/rr/tmpLlosmu/w/src/third_party/catapult/telemetry/telemetry/internal/browser/web_contents.py", line 221, in EvaluateJavaScriptInContext
    expr, context_id=context_id, timeout=timeout)
  File "/b/rr/tmpLlosmu/w/src/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/rr/tmpLlosmu/w/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py", line 36, in inner
    return func(inspector_backend, *args, **kwargs)
  File "/b/rr/tmpLlosmu/w/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py", line 211, in EvaluateJavaScript
    return self._runtime.Evaluate(expr, context_id, timeout)
  File "/b/rr/tmpLlosmu/w/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_runtime.py", line 53, in Evaluate
    raise exceptions.EvaluateException(text)
EvaluateException: Uncaught
https://uberchromegw.corp.google.com/i/chromium.perf/builders/Android%20Nexus5%20Perf%20%282%29/builds/4296/steps/system_health.common_mobile/logs/stdio