page_cycler_v2.typical_25 fails to run on canaries.

python /var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/tools/perf/run_benchmark --browser=cros-chrome --remote=chromeos2-row9-rack8-host19.cros --output-dir="/tmp/test_that_results_8SqmFQ/results-1-telemetry_Crosperf/telemetry_Crosperf/results" --output-format=chartjson  page_cycler_v2.typical_25
17:59:47 INFO | autoserv| Telemetry completed with exit code: 255.
17:59:47 INFO | autoserv| stdout:[ RUN      ] http://www.nick.com/games@{'cache_temperature': 'pcv1-cold'}

17:59:47 INFO | autoserv| Traceback (most recent call last):
17:59:47 INFO | autoserv| File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/third_party/catapult/telemetry/telemetry/internal/story_runner.py", line 98, in _RunStoryAndProcessErrorIfNeeded
17:59:47 INFO | autoserv| state.WillRunStory(story)
17:59:47 INFO | autoserv| File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 75, in traced_function
17:59:47 INFO | autoserv| return func(*args, **kwargs)
17:59:47 INFO | autoserv| File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/third_party/catapult/telemetry/telemetry/page/shared_page_state.py", line 230, in WillRunStory
17:59:47 INFO | autoserv| self._StartBrowser(page)
17:59:47 INFO | autoserv| File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 75, in traced_function
17:59:47 INFO | autoserv| return func(*args, **kwargs)
17:59:47 INFO | autoserv| File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/third_party/catapult/telemetry/telemetry/page/shared_page_state.py", line 189, in _StartBrowser
17:59:47 INFO | autoserv| self._browser = self._possible_browser.Create(self._finder_options)
17:59:47 INFO | autoserv| File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_finder.py", line 50, in Create
17:59:47 INFO | autoserv| self._credentials_path)
17:59:47 INFO | autoserv| File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/third_party/catapult/telemetry/telemetry/internal/browser/browser.py", line 59, in __init__
17:59:47 INFO | autoserv| self._browser_backend.Start()
17:59:47 INFO | autoserv| File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 75, in traced_function
17:59:47 INFO | autoserv| return func(*args, **kwargs)
17:59:47 INFO | autoserv| File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py", line 143, in Start
17:59:47 INFO | autoserv| self._WaitForBrowserToComeUp()
17:59:47 INFO | autoserv| File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 75, in traced_function
17:59:47 INFO | autoserv| return func(*args, **kwargs)
17:59:47 INFO | autoserv| File "/var/cache/chromeos-cache/distfiles/target/chrome-src-internal/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/chrome_browser_backend.py", line 160, in _WaitForBrowserToComeUp
17:59:47 INFO | autoserv| raise exceptions.BrowserConnectionGoneException(self.browser, e)
17:59:47 INFO | autoserv| BrowserConnectionGoneException: Timed out while waiting 240s for HasBrowserFinishedLaunching