Port perf.py's _LoginToGoogleAccount to chrome_remote_control

tools/chrome_remote_control/chrome_remote_control/tab.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.
 from chrome_remote_control import inspector_console
 from chrome_remote_control import inspector_page
 from chrome_remote_control import inspector_runtime
 from chrome_remote_control import util
 
 DEFAULT_TAB_TIMEOUT = 60
 
@@ skipping 57 matching lines @@
     util.WaitFor(
         lambda: self._runtime.Evaluate('document.readyState') == 'complete',
         timeout)
 
   def WaitForDocumentReadyStateToBeInteractiveOrBetter(
       self, timeout=DEFAULT_TAB_TIMEOUT):
     def IsReadyStateInteractiveOrBetter():
       rs = self._runtime.Evaluate('document.readyState')
       return rs == 'complete' or rs == 'interactive'
     util.WaitFor(IsReadyStateInteractiveOrBetter, timeout)
+
+  def LoginNeeded(self, credentials_type):
+    self.browser.LoginNeeded(credentials_type, self)
+
+  def LoginNoLongerNeeded(self, credentials_type):
+    self.browser.LoginNoLongerNeeded(credentials_type, self)