[Telemetry] fix google_credentials_backend_unittest.py and facebook_credentials_backend_unittest.py.

tools/telemetry/telemetry/form_based_credentials_backend.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.
 
 import logging
 
 import telemetry
 from telemetry import util
 
 
@@ skipping 44 matching lines @@
     raise NotImplementedError()
 
   @property
   def already_logged_in_element_id(self):
     raise NotImplementedError()
 
   @property
   def password_input_id(self):
     raise NotImplementedError()
 
+  def IsLoggedIn(self):
+    return self._logged_in
+
+  def _ResetLoggedInState(self):
+    """Makes the backend think we're not logged in even though we are.
+    Should only be used in unit tests to simulate --dont-override-profile.
+    """
+    self._logged_in = False
+
   def LoginNeeded(self, tab, config):
     """Logs in to a test account.
 
     Raises:
       RuntimeError: if could not get credential information.
     """
     if self._logged_in:
       return True
 
     if 'username' not in config or 'password' not in config:
@@ skipping 27 matching lines @@
       _SubmitFormAndWait(self.login_form_id, tab)
 
       self._logged_in = True
       return True
     except telemetry.TimeoutException:
       logging.warning('Timed out while loading: %s', self.url)
       return False
 
   def LoginNoLongerNeeded(self, tab): # pylint: disable=W0613
     assert self._logged_in