I have a patch (https://chromium-review.googlesource.com/c/603614) and one tryrun failed with it:

https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Ftryserver.chromium.linux%2Flinux_chromium_rel_ng%2F519029%2F%2B%2Frecipes%2Fsteps%2Ftelemetry_perf_unittests__with_patch_%2F0%2Fstdout

Like this:

***************** END OF BROWSER LOG ******************
  No path to crashpad_database_util found
  No minidump found via crashpad_database_util
  No path to crashpad_database_util found
  No minidump found via crashpad_database_util
  Exception when trying to capture screenshot: DevtoolsTargetCrashException('Devtools target crashed',)
  Closing browser (pid=2380) ...
  rmtree is invoked with arguments: ('/b/s/w/it31Haao/tmpQ1W98h',) {'ignore_errors': True}
  Call site info:   File "/b/s/w/ir/third_party/catapult/telemetry/telemetry/internal/browser/browser.py", line 278, in Close
    File "/b/s/w/ir/third_party/catapult/common/py_trace_event/py_trace_event/trace_event_impl/decorators.py", line 52, in traced_function
    File "/b/s/w/ir/third_party/catapult/telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.py", line 657, in Close
  
  Try printing formatted exception: None None None
  
  Traceback (most recent call last):
    RunBenchmark at /b/s/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py:340
      None
    Run at /b/s/w/ir/third_party/catapult/telemetry/telemetry/internal/story_runner.py:238
      None
    PopulateHistogramSet at /b/s/w/ir/third_party/catapult/telemetry/telemetry/internal/results/page_test_results.py:194
      None
    ConvertChartJson at /b/s/w/ir/third_party/catapult/tracing/tracing/value/convert_chart_json.py:24
      None
    RunFile at /b/s/w/ir/third_party/catapult/third_party/vinn/vinn/_vinn.py:164
      None
  AssertionError
  
  Locals:
    file_path    : '/b/s/w/ir/third_party/catapult/tracing/tracing/value/convert_chart_json_cmdline.html'
    js_args      : ['/b/s/w/it31Haao/tmpRE_VKp']
    source_paths : ['/b/s/w/ir/third_party/catapult/tracing', '/b/s/w/ir/third_party/catapult/third_party/polymer', '/b/s/w/ir/third_party/catapult/tracing/third_party', '/b/s/w/ir/third_party/catapult/tracing/tracing/mre', '/b/s/w/ir/third_party/catapult/tracing/third_party/jszip', '/b/s/w/ir/third_party/catapult/tracing/third_party/gl-matrix/dist', '/b/s/w/ir/third_party/catapult/tracing/third_party/mannwhitneyu', '/b/s/w/ir/third_party/catapult/tracing/third_party/d3', '/b/s/w/ir/third_party/catapult/tracing/third_party/chai', '/b/s/w/ir/third_party/catapult/tracing/third_party/mocha', '/b/s/w/ir/third_party/catapult/tracing/third_party/oboe']
    stdin        : -1
    stdout       : -1
    v8_args      : None
  
  Traceback (most recent call last):
    File "/b/s/w/ir/tools/perf/benchmarks/benchmark_smoke_unittest.py", line 85, in BenchmarkSmokeTest
  AssertionError: Failed: <class 'benchmarks.tab_switching.TabSwitchingTypical25'>
20 tests passed in 943.7s, 8 skipped, 1 failure.
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/usr/lib/python2.7/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/b/s/w/ir/third_party/catapult/telemetry/telemetry/internal/util/atexit_with_log.py", line 11, in _wrapped_function
  File "/b/s/w/ir/third_party/catapult/telemetry/telemetry/internal/util/webpagereplay_go_server.py", line 240, in StopServer
  File "/b/s/w/ir/third_party/catapult/telemetry/telemetry/internal/util/webpagereplay_go_server.py", line 294, in _CleanUpTempLogFilePath
OSError: [Errno 2] No such file or directory: '/b/s/w/it31Haao/tmpDw56fa'
Error in sys.exitfunc:
(INFO) 2017-08-07 11:24:15,140 pid=16162  exception_formatter.PrintFormattedException:19  Try printing formatted exception: <type 'exceptions.OSError'> [Errno 2] No such file or directory: '/b/s/w/it31Haao/tmpDw56fa' <traceback object at 0x7fadfe6388c0>
Traceback (most recent call last):
  _run_exitfuncs at /usr/lib/python2.7/atexit.py:24
    func(*targs, **kargs)
  _wrapped_function at /b/s/w/ir/third_party/catapult/telemetry/telemetry/internal/util/atexit_with_log.py:11
    None
  StopServer at /b/s/w/ir/third_party/catapult/telemetry/telemetry/internal/util/webpagereplay_go_server.py:240
    None
  _CleanUpTempLogFilePath at /b/s/w/ir/third_party/catapult/telemetry/telemetry/internal/util/webpagereplay_go_server.py:294
    None
OSError: [Errno 2] No such file or directory: '/b/s/w/it31Haao/tmpDw56fa'


====================================

could be an issue with the new Go server integration?

Hope this helps. I think it is not blocking me, feel free to close