Taking ownership of this until the test is disabled and the bisect launched.

Exception looks like:

Traceback (most recent call last):
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py", line 123, in _RunStoryAndProcessErrorIfNeeded
    state.RunStory(results)
  File "/b/swarming/w/ir/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 52, in traced_function
    return func(*args, **kwargs)
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/page/shared_page_state.py", line 311, in RunStory
    self._current_page.Run(self)
  File "/b/swarming/w/ir/third_party/catapult/telemetry/telemetry/page/__init__.py", line 95, in Run
    self.RunPageInteractions(action_runner)
  File "/b/swarming/w/ir/tools/perf/page_sets/key_mobile_sites_smooth.py", line 339, in RunPageInteractions
    distance_expr='document.body.scrollHeight - window.innerHeight')
  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/internal/actions/action_runner.py", line 516, in ScrollElement
    use_touch=use_touch, synthetic_gesture_source=synthetic_gesture_source))
  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/internal/actions/action_runner.py", line 62, in _RunAction
    action.RunAction(self._tab)
  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/internal/actions/scroll.py", line 116, in RunAction
    tab.WaitForJavaScriptCondition('window.__scrollActionDone', timeout=60)
  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/internal/browser/web_contents.py", line 239, in WaitForJavaScriptCondition
    return self._inspector_backend.WaitForJavaScriptCondition(*args, **kwargs)
  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/internal/backends/chrome_inspector/inspector_backend.py", line 302, in WaitForJavaScriptCondition
    e.message + '\n' + debug_message)
TimeoutException: Timed out while waiting 60s for IsJavaScriptExpressionTrue.

Failure screenshot here: https://console.developers.google.com/m/cloudstorage/b/chrome-telemetry-output/o/90616172-3f11-11e8-b997-0242ac110006

This doesn't give any obvious indication as to what failed.

Flakiness dashboard definitely seems to suggest that the flakiness of this test increased somewhere between r549088 (good) and r549189 (bad). Before, it was ~10% flaky like the other platforms and now it seems to be more like 40% flaky.

Going to disable on N7v2 and kick off a bisect over that revision range.

Deleted: Screen Shot 2018-04-13 at 2.37.50 PM.png 291 KB

	Screen Shot 2018-04-13 at 2.37.50 PM.png 291 KB View Download

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/11869052c40000

📍 Couldn't reproduce a difference.
https://pinpoint-dot-chromeperf.appspot.com/job/11869052c40000

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/12ccef0ec40000

Kicked off a bisect with a wider range.

📍 Couldn't reproduce a difference.
https://pinpoint-dot-chromeperf.appspot.com/job/12ccef0ec40000