Add mobile version of v8.infinite_scroll benchmark.

tools/perf/page_sets/login_helpers/login_utils.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.
 
 import json
 import os
 
 
 DEFAULT_CREDENTIAL_PATH = os.path.join(
     os.path.dirname(__file__), os.path.pardir, 'data', 'credentials.json')
 
 
 def GetAccountNameAndPassword(credential,
                               credentials_path=DEFAULT_CREDENTIAL_PATH):
   """Returns username and password for |credential| in credentials_path file.
 
   Args:
     credential: The credential to retrieve from the file (type string).
     credentials_path: The string that specifies the path to credential file.
 
   Returns:
     A tuple (username, password) in which both are username and password
     strings.
   """
   with open(credentials_path, 'r') as f:
     credentials = json.load(f)
   c = credentials.get(credential)
   return c['username'], c['password']
 
+def InputWithSelector(action_runner, input_text, input_selector):
+  """Sets the text value of an input field in a form on the page.
+
+  Waits until the input element exists on the page. Then executes JS to populate
+  the value property of the element with |input_text|.
+
+  Args:
+    action_runner: ActionRunner instance to execute JS to populate form fields.
+    input_text: Text string to populate the input field with.
+    input_selector: The selector of the input element.
+
+
+  Raises:
+    exceptions.TimeoutException: If waiting to find the element times out.
+    exceptions.Error: See ExecuteJavaScript() for a detailed list of
+      possible exceptions.
+  """
+  action_runner.WaitForElement(selector=input_selector)
+  action_runner.ExecuteJavaScript(
+      'document.querySelector("%s").value = "%s";' %
+      (input_selector, input_text))
 
 def InputForm(action_runner, input_text, input_id, form_id=None):
   """Sets the text value of an input field in a form on the page.
 
   Waits until the input element exists on the page. Then executes JS to populate
   the value property of the element with |input_text|.
 
   Args:
     action_runner: ActionRunner instance to execute JS to populate form fields.
     input_text: Text string to populate the input field with.
     input_id: Id of the input field to populate. (type string).
     form_id: Optional form id string to identify |input_id| in querySelector.
 
   Raises:
     exceptions.TimeoutException: If waiting to find the element times out.
     exceptions.Error: See ExecuteJavaScript() for a detailed list of
       possible exceptions.
   """
   if form_id and input_id:
     element_selector = '#%s #%s' % (form_id, input_id)
   elif input_id:
     element_selector = '#%s' % (input_id)
   else:
     raise ValueError("Input ID can not be None or empty.")
-  action_runner.WaitForElement(selector=element_selector)
-  action_runner.ExecuteJavaScript(
-      'document.querySelector("%s").value = "%s";' %
-      (element_selector, input_text))
+  InputWithSelector(action_runner, input_text, element_selector)
+