service_worker.service_worker failing on chromium.perf/Android One Perf

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


https://chromium-swarm.appspot.com/task?id=36ee1924a7805c10&refresh=10&show_raw=1 is a swarming task.

Screenshot shows what I assume is the page.

This exception is in the log:


Traceback (most recent call last):
  RunBenchmark at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py:398
    expectations=expectations, metadata=benchmark.GetMetadata())
  Run at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py:262
    _RunStoryAndProcessErrorIfNeeded(story, results, state, test)
  _RunStoryAndProcessErrorIfNeeded at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py:99
    state.RunStory(results)
  traced_function at /b/swarming/w/ir/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py:52
    return func(*args, **kwargs)
  RunStory at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/page/shared_page_state.py:298
    self._current_page, self._current_tab, results)
  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)
  ValidateAndMeasurePage at /b/swarming/w/ir/tools/perf/benchmarks/service_worker.py:132
    self._speed_index.Stop(page, tab)
  Stop at /b/swarming/w/ir/tools/perf/metrics/speedindex.py:50
    self._impl.Stop(tab)
  Stop at /b/swarming/w/ir/tools/perf/metrics/speedindex.py:171
    for time, image in video_capture.GetVideoFrameIter()
  GetVideoFrameIter at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/image_processing/video.py:55
    bmp, HIGHLIGHT_ORANGE_FRAME)
  _FindHighlightBoundingBox at /b/swarming/w/ir/third_party/catapult/telemetry/telemetry/internal/image_processing/video.py:91
    raise BoundingBoxNotFoundException('Unexpectedly small tab contents.')
BoundingBoxNotFoundException: Unexpectedly small tab contents.


Disabling the story.