[chromeos] pyauto tests should auto login by default on chromeos

chrome/test/pyautolib/policy_base.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Base class for tests that need to update the policies enforced by Chrome.
 
 Subclasses can call SetUserPolicy (ChromeOS, Linux, Windows) and
 SetDevicePolicy (ChromeOS only) with a dictionary of the policies to install.
 
 The current implementation depends on the platform. The implementations might
@@ skipping 87 matching lines @@
     owner = 'user@example.com'
     # Subclasses may override these credentials to fake enrollment into another
     # mode or use different device and machine IDs.
     mode = 'enterprise'
     device_id = string.upper(str(uuid.uuid4()))
     machine_id = 'CROSTEST'
 
     _auth_server = None
     _dns_server = None
 
+  def ShouldAutoLogin(self):
+    return False
+
   @staticmethod
   def _Call(command, check=False):
     """Invokes a subprocess and optionally asserts the return value is zero."""
     with open(os.devnull, 'w') as devnull:
       if check:
         return subprocess.check_call(command.split(' '), stdout=devnull)
       else:
         return subprocess.call(command.split(' '), stdout=devnull)
 
   def _WriteFile(self, path, content):
@@ skipping 456 matching lines @@
     Args:
       device_policy: The device policy to set. None clears it.
       refresh: If True, Chrome will refresh and apply the new policy.
                Requires Chrome to be alive for it.
     """
     assert self.IsChromeOS()
     self._device_policy = device_policy or {}
     self._WritePolicyOnChromeOS()
     if refresh:
       self.RefreshPolicies()