[system health] Add media browsing stories.

tools/perf/page_sets/login_helpers/facebook_login.py

 # Copyright 2015 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 LoginWithMobileSite(
     action_runner, credential,
     credentials_path=login_utils.DEFAULT_CREDENTIAL_PATH):
   """Logs in into mobile Facebook account.
@@ skipping 15 matching lines @@
       credential, credentials_path=credentials_path)
 
   action_runner.Navigate(
        'https://m.facebook.com/login?continue=https%3A%2F%2Fm.facebook.com')
   login_utils.InputWithSelector(action_runner, account_name, '[name=email]')
   login_utils.InputWithSelector(action_runner, password, '[name=pass]')
   action_runner.ClickElement(selector='[name=login]')
   action_runner.WaitForElement(text='OK')
   action_runner.ClickElement(text='OK')
   action_runner.WaitForNavigate()
+
+
+def LoginWithDesktopSite(
+    action_runner, credential,
+    credentials_path=login_utils.DEFAULT_CREDENTIAL_PATH):
+  """Logs in into mobile Facebook account.

[nednguyen, 2016/07/26 18:33:43]

s/mobile/desktop

[Hannes Payer (out of office), 2016/07/27 09:04:33]

Done.

+
+  This function navigates the tab into Facebook'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
+        (type string).
+    credentials_path: The string that specifies the path to credential file.
+
+  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://m.facebook.com/login?continue=https%3A%2F%2Fm.facebook.com')

[nednguyen, 2016/07/26 18:33:43]

nits: change this url to the desktop one

[Hannes Payer (out of office), 2016/07/27 09:04:33]

The desktop login page gets stuck most of the time because facebook login wants
cookies enabled and rejects login. I do not run into this login problem using
the mobile site, which after login transitions to non-mobile facebook. Can I use
the mobile login procedure? WDYT?

[nednguyen, 2016/07/27 13:58:43]

ok, but can you add some documentation explaining the reason here.

[Hannes Payer (out of office), 2016/07/28 14:03:44]

Done.

+  login_utils.InputWithSelector(action_runner, account_name, '[name=email]')
+  login_utils.InputWithSelector(action_runner, password, '[name=pass]')
+  action_runner.ClickElement(selector='[name=login]')
+  action_runner.WaitForElement(text='OK')
+  action_runner.ClickElement(text='OK')
+  action_runner.WaitForNavigate()