From health-plan-webview-phone.
https://uberchromegw.corp.google.com/i/internal.client.clank/builders/health-plan-webview-phone/builds/1216/steps/memory.top_10_mobile/logs/stdio

Traceback (most recent call last):
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/android_platform/development/scripts/stack", line 233, in <module>
    sys.exit(main(sys.argv[1:]))
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/android_platform/development/scripts/stack", line 224, in main
    stack_core.ConvertTrace(lines, load_vaddrs, more_info)
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/android_platform/development/scripts/stack_core.py", line 159, in ConvertTrace
    ResolveCrashSymbol(list(useful_log), more_info)
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/android_platform/development/scripts/stack_core.py", line 276, in ResolveCrashSymbol
    symbol.TranslateLibPath(lib), code_addresses[lib], more_info)
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/android_platform/development/scripts/symbol.py", line 408, in SymbolInformationForSet
    addr_to_line = CallAddr2LineForSet(lib, unique_addrs)
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/android_platform/development/scripts/symbol.py", line 447, in __call__
    result = self.fn(lib, no_cache)
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/android_platform/development/scripts/symbol.py", line 495, in CallAddr2LineForSet
    (label, platform, target) = FindToolchain()
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/android_platform/development/scripts/symbol.py", line 155, in FindToolchain
    raise Exception("Could not find tool chain")
Exception: Could not find tool chain
(ERROR) 2016-06-13 17:30:36,934 exceptions.__init__:71  Problem when trying to gather standard output: 'NoneType' object has no attribute 'splitlines'
(WARNING) 2016-06-13 17:30:36,934 action_runner.__exit__:709  Exception was raised in the with statement block, the end of interaction record is not marked.
(INFO) 2016-06-13 17:30:36,935 cmd_helper._ValidateAndLogCommand:153  [host]> /b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/devil/bin/deps/linux2/x86_64/bin/adb -s 06ab36ab003b6b23 shell '( /system/bin/screencap -p /data/local/tmp/temp_file-6a8f470735651.png );echo %$?'
(INFO) 2016-06-13 17:30:37,965 cmd_helper._ValidateAndLogCommand:153  [host]> /b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/devil/bin/deps/linux2/x86_64/bin/adb -s 06ab36ab003b6b23 pull /data/local/tmp/temp_file-6a8f470735651.png /tmp/tmpQ7QpDd.png
(INFO) 2016-06-13 17:30:38,148 cmd_helper._ValidateAndLogCommand:153  [host]> /b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/devil/bin/deps/linux2/x86_64/bin/adb -s 06ab36ab003b6b23 shell 'rm -f /data/local/tmp/temp_file-6a8f470735651.png'
Traceback (most recent call last):
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/telemetry/internal/story_runner.py", line 84, in _RunStoryAndProcessErrorIfNeeded
    state.RunStory(results)
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/telemetry/page/shared_page_state.py", line 306, in RunStory
    self._current_page.Run(self)
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/telemetry/page/__init__.py", line 99, in Run
    self.RunPageInteractions(action_runner)
  File "/b/build/slave/health-plan-webview-phone/build/src/tools/perf/page_sets/memory_top_10_mobile.py", line 79, in RunPageInteractions
    self._TakeMemoryMeasurement(action_runner)
  File "/b/build/slave/health-plan-webview-phone/build/src/tools/perf/page_sets/memory_top_10_mobile.py", line 40, in _TakeMemoryMeasurement
    action_runner.ForceGarbageCollection()
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/telemetry/internal/actions/action_runner.py", line 658, in ForceGarbageCollection
    self._tab.CollectGarbage()
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/telemetry/internal/browser/tab.py", line 238, in CollectGarbage
    self._inspector_backend.CollectGarbage()
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py", line 35, in inner
    inspector_backend._ConvertExceptionFromInspectorWebsocket(e)
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py", line 32, in inner
    return func(inspector_backend, *args, **kwargs)
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_backend.py", line 346, in CollectGarbage
    self._page.CollectGarbage()
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_page.py", line 155, in CollectGarbage
    res = self._inspector_websocket.SyncRequest(request, timeout)
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_websocket.py", line 110, in SyncRequest
    res = self._Receive(timeout)
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome_inspector/inspector_websocket.py", line 149, in _Receive
    data = self._socket.recv()
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/third_party/websocket-client/websocket.py", line 596, in recv
    opcode, data = self.recv_data()
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/third_party/websocket-client/websocket.py", line 606, in recv_data
    frame = self.recv_frame()
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/third_party/websocket-client/websocket.py", line 637, in recv_frame
    self._frame_header = self._recv_strict(2)
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/third_party/websocket-client/websocket.py", line 746, in _recv_strict
    bytes = self._recv(shortage)
  File "/b/build/slave/health-plan-webview-phone/build/src/third_party/catapult/telemetry/third_party/websocket-client/websocket.py", line 739, in _recv
    raise WebSocketConnectionClosedException()
DevtoolsTargetCrashException: Devtools target crashed