Running to timeout issue on oobe_exists on various CFM devices (guado, panther, rikku, zako). Stack trace below:

08/08 04:57:43.253 WARNI|              test:0606| Autotest caught exception when running test:
Traceback (most recent call last):
  File "/usr/local/autotest/client/common_lib/test.py", line 600, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 804, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 461, in execute
    dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 347, in _call_run_once_with_retry
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/client/common_lib/test.py", line 376, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/server/site_tests/enterprise_CFM_VolumeChange/enterprise_CFM_VolumeChange.py", line 119, in run_once
    raise error.TestFail(str(e))
TestFail: RPC error: cfm.enroll_device
Traceback (most recent call last):
  File "./multimedia_xmlrpc_server.py", line 70, in _dispatch
    return func(*params)
  File "/usr/local/autotest/cros/multimedia/cfm_facade_native.py", line 39, in enroll_device
    self._resource.start_custom_chrome({"auto_login": False})
  File "/usr/local/autotest/cros/multimedia/facade_resource.py", line 57, in start_custom_chrome
    self._chrome = chrome.Chrome(**kwargs)
  File "/usr/local/autotest/common_lib/cros/chrome.py", line 189, in __init__
    self._browser = browser_to_create.Create(finder_options)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_finder.py", line 50, in Create
    self._credentials_path)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_with_oobe.py", line 14, in __init__
    backend, platform_backend, credentials_path)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/browser/browser.py", line 55, in __init__
    self._browser_backend.Start()
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/internal/backends/chrome/cros_browser_backend.py", line 126, in Start
    util.WaitFor(lambda: self.oobe_exists, 10)
  File "/usr/local/telemetry/src/third_party/catapult/telemetry/telemetry/core/util.py", line 94, in WaitFor
    (timeout, GetConditionString()))
TimeoutException: Timed out while waiting 10s for util.WaitFor(lambda: self.oobe_exists, 10).



Change oobe_exists timeout value in cros_browser_backend.py to 30 seconds.