See the latest Falco-chrome-pfq: https://uberchromegw.corp.google.com/i/chromeos/builders/falco-chrome-pfq/builds/5280, which has the long-standing "SSHConnectionError timeout" error (see  Issue 687248 ) and also a new video_ChromeHWDecodeUsed error. 

Selected error message:
video_ChromeHWDecodeUsed                    FAIL: Unhandled unicode: Unhandled TimeoutException: 

System log from debug info of video_ChromeHWDecodeUsed:
(Not implemented)
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(/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py:492 _ConvertExceptionFromInspectorWebsocket) Original exception:
timed out
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(/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py:513 _AddDebuggingInformation) Received a socket error in the browser connection and the tab still exists. The operation probably timed out.
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(/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py:514 _AddDebuggingInformation) Debugger url: ws://127.0.0.1:59282/devtools/page/a350068d-3f5c-4e23-a287-459731281294
Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 804, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/common_lib/test.py", line 461, in execute
    dargs)
  File "/usr/local/autotest/common_lib/test.py", line 347, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/common_lib/test.py", line 376, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/tests/video_ChromeHWDecodeUsed/video_ChromeHWDecodeUsed.py", line 60, in run_once
    tab1.Navigate(video_file)
  File "/usr/local/telemetry/src/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 "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/browser/web_contents.py", line 278, in Navigate
    self._inspector_backend.Navigate(url, script_to_evaluate_on_commit, timeout)
  File "/usr/local/telemetry/src/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 "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py", line 40, in inner
    inspector_backend._ConvertExceptionFromInspectorWebsocket(e)
  File "/usr/local/telemetry/src/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 "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py", line 37, in inner
    return func(inspector_backend, *args, **kwargs)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py", line 176, in Navigate
    self._page.Navigate(url, script_to_evaluate_on_commit, timeout)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_page.py", line 125, in Navigate
    self.WaitForNavigate(timeout)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_page.py", line 94, in WaitForNavigate
    self._inspector_websocket.DispatchNotifications(remaining_time)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_websocket.py", line 134, in DispatchNotifications
    self._Receive(timeout)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_websocket.py", line 149, in _Receive
    data = self._socket.recv()
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/third_party/websocket-client/websocket.py", line 596, in recv
    opcode, data = self.recv_data()
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/third_party/websocket-client/websocket.py", line 606, in recv_data
    frame = self.recv_frame()
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/third_party/websocket-client/websocket.py", line 637, in recv_frame
    self._frame_header = self._recv_strict(2)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/third_party/websocket-client/websocket.py", line 746, in _recv_strict
    bytes = self._recv(shortage)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/third_party/websocket-client/websocket.py", line 732, in _recv
    raise WebSocketTimeoutException(e.message)
TimeoutException: 
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(/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py:487 _ConvertExceptionFromInspectorWebsocket) The app is probably crashed:


I'll try to run remote build bots on cbuildbot to see if it's a flake or real failure.