N CTS bot is showing a bunch of test failures. Seems to be a shard timeout causing these failures.

Link to first failure: https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.android%2FAndroid_WebView_N__dbg_%2F1339%2F%2B%2Frecipes%2Fsteps%2FRun_CTS%2F0%2Fstdout

Traceback (most recent call last):
  File "/b/c/b/Android_WebView_N__dbg_/src/build/android/pylib/local/device/local_device_environment.py", line 55, in wrapper
    return f(dev, *args, **kwargs)
  File "/b/c/b/Android_WebView_N__dbg_/src/build/android/pylib/local/device/local_device_test_run.py", line 79, in run_tests_on_device
    result, rerun = self._RunTest(dev, test)
  File "/b/c/b/Android_WebView_N__dbg_/src/build/android/pylib/local/device/local_device_instrumentation_test_run.py", line 259, in _RunTest
    target, raw=True, extras=extras, timeout=timeout, retries=0)
  File "/b/c/b/Android_WebView_N__dbg_/src/third_party/catapult/devil/devil/android/decorators.py", line 57, in timeout_retry_wrapper
    retry_if_func=retry_if_func)
  File "/b/c/b/Android_WebView_N__dbg_/src/third_party/catapult/devil/devil/utils/timeout_retry.py", line 159, in Run
    error_log_func=error_log_func)
  File "/b/c/b/Android_WebView_N__dbg_/src/third_party/catapult/devil/devil/utils/reraiser_thread.py", line 186, in JoinAll
    self._JoinAll(watcher, timeout)
  File "/b/c/b/Android_WebView_N__dbg_/src/third_party/catapult/devil/devil/utils/reraiser_thread.py", line 151, in _JoinAll
    (len(alive_threads), len(self._threads)))