[System Health] Add browsing user stories for pinterest and tumblr.

tools/perf/page_sets/login_helpers/pinterest_login.py

 # Copyright 2016 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 page_sets.login_helpers import login_utils
 
 
-def LoginAccount(action_runner, credential,
+def LoginDesktopAccount(action_runner, credential,
                  credentials_path=login_utils.DEFAULT_CREDENTIAL_PATH):
   """Logs in into a Dropbox account.
 
   This function navigates the tab into Dropbox's login page and logs in a user
   using credentials in |credential| part of the |credentials_path| file.
 
   Args:
     action_runner: Action runner responsible for running actions on the page.
     credential: The credential to retrieve from the credentials file (string).
     credentials_path: The path to credential file (string).
 
   Raises:
     exceptions.Error: See ExecuteJavaScript()
     for a detailed list of possible exceptions.
   """
   account_name, password = login_utils.GetAccountNameAndPassword(
       credential, credentials_path=credentials_path)
 
-  action_runner.Navigate('https://www.pandora.com/account/sign-in')
+  action_runner.Navigate('https://www.pinterest.com/login/')
+  action_runner.Wait(1) # Error page happens if this wait is not here.
   login_utils.InputWithSelector(
-      action_runner, account_name, 'input[id=login_username]')
+      action_runner, '%s@gmail.com' % account_name, 'input[type=email]')
   login_utils.InputWithSelector(
-      action_runner, password, 'input[id=login_password]')
+      action_runner, password, 'input[type=password]')
 
-  login_button_function = ('document.getElementsByClassName('
-                           '"onboarding__form__button onboarding__b1 '
-                           'onboarding__form__button--blue loginButton")[0]')
+  login_button_function = (
+      'document.getElementsByClassName("Button Module btn hasText large '
+      'primary continueButton rounded")[0]')
+  action_runner.WaitForElement(element_function=login_button_function)
   action_runner.ClickElement(element_function=login_button_function)
+
+  search_bar_function = (
+      'document.getElementsByClassName("Input Module field")[0]')
+  action_runner.WaitForElement(element_function=search_bar_function)