[System Health] Create first System Health media user stories.

tools/perf/page_sets/login_helpers/pandora_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,
                  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.dropbox.com/login')
+  action_runner.Navigate('https://www.pandora.com/account/sign-in')
   login_utils.InputWithSelector(
-      action_runner, account_name, 'input[name=login_email]')
+      action_runner, account_name, 'input[id=login_username]')
   login_utils.InputWithSelector(
-      action_runner, password, 'input[name=login_password]')
+      action_runner, password, 'input[id=login_password]')
 
-  # Wait until the "Sign in" button is enabled and then click it.
-  login_button_selector = '.login-form .login-button'
-  action_runner.WaitForJavaScriptCondition('''
-      (function() {
-        var loginButton = document.querySelector("%s");
-        if (!loginButton)
-          return false;
-        return !loginButton.disabled;
-      })();''' % login_button_selector)
-  action_runner.ClickElement(selector=login_button_selector)
-  action_runner.WaitForNavigate()
+  login_button_function = ('document.getElementsByClassName('

[petrcermak, 2016/09/14 16:42:56]

I would personally just inline this into the action_runner.ClickElement call
(feel free to ignore this comment).

[rnephew (Reviews Here), 2016/09/20 21:09:54]

I like naming it. It makes it easier to understand what is going on than trying
to parse meaning from the function itself.

+                           '"onboarding__form__button onboarding__b1 onboarding'
+                           '__form__button--blue loginButton")[0]')

[petrcermak, 2016/09/14 16:42:56]

nit: could you put the last "onboarding" on this line so that the Python line
break happens at the space in the JS string?

[rnephew (Reviews Here), 2016/09/20 21:09:54]

Done.

[rnephew (Reviews Here), 2016/09/20 21:09:54]

Done.

+  action_runner.ClickElement(element_function=login_button_function)