Fix to enable the cached credentials login test

chrome/test/pyautolib/pyauto.py

Index: chrome/test/pyautolib/pyauto.py
diff --git a/chrome/test/pyautolib/pyauto.py b/chrome/test/pyautolib/pyauto.py
index 010595d947d2262b8b5cb2b2390e0e81f5fa72d1..8d644f32a8c4b600e990092f7370cd61a8e2ec92 100755
--- a/chrome/test/pyautolib/pyauto.py
+++ b/chrome/test/pyautolib/pyauto.py
@@ -4602,7 +4602,7 @@ class PyUITest(pyautolib.PyUITestBase, unittest.TestCase):
         'Chrome did not reopen the testing channel after login as guest.'
     self.SetUp()
 
-  def Login(self, username, password):
+  def Login(self, username, password, use_cached_credentials=False):
     """Login to chromeos.
 
     Waits until logged in and browser is ready.
@@ -4612,6 +4612,11 @@ class PyUITest(pyautolib.PyUITestBase, unittest.TestCase):
     will not be noticed here, because the browser has no knowledge of it. In
     this case the GetNextEvent automation command will always time out.
 
+    Args:
+      username, password: User credentials for login.
+      use_cached_credentials: Should we login with cached credentials or
+      resubmit credentials and wait for validation?
+
     Returns:
       An error string if an error occured.
       None otherwise.
@@ -4625,12 +4630,11 @@ class PyUITest(pyautolib.PyUITestBase, unittest.TestCase):
         'command': 'SubmitLoginForm',
         'username': username,
         'password': password,
+        'use_cached_credentials': use_cached_credentials,
     }
     self._GetResultFromJSONRequest(cmd_dict, windex=None)
     self.AddDomEventObserver('loginfail', automation_id=4444)
     try:
-      # TODO(craigdh): Add login failure events once PyAuto switches to mocked
-      # GAIA authentication.
       if self.GetNextEvent().get('name') == 'loginfail':
         raise JSONInterfaceError('Login denied by auth server.')
     except JSONInterfaceError as e: