Add NavigateToPage API for action_runner.

tools/perf/page_sets/gmail_compose_discard.py

 # Copyright 2014 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.
 # pylint: disable=W0401,W0614
 from telemetry.page.actions.all_page_actions import *
 from telemetry.page import page as page_module
 from telemetry.page import page_set as page_set_module
 
 
 class GmailComposeDiscardPage(page_module.Page):
 
   """ Why: Compose and discard a new email """
 
   def __init__(self, page_set):
     super(GmailComposeDiscardPage, self).__init__(
       url='https://mail.google.com/mail/',
       page_set=page_set)
     self.credentials_path = 'data/credentials.json'
     self.credentials = 'google'
     self.user_agent_type = 'desktop'
 
   def RunNavigateSteps(self, action_runner):
-    action_runner.RunAction(NavigateAction())
+    action_runner.NavigateToPage(self)
     action_runner.RunAction(WaitAction(
       {
         'javascript': (
           'window.gmonkey !== undefined &&'
           'document.getElementById("gb") !== null')
       }))
 
   def ComposeClick(self, action_runner):
     action_runner.RunAction(JavascriptAction({
       'expression': '''
@@ skipping 34 matching lines @@
   Description: Gmail endure test: compose and discard an email.
   """
 
   def __init__(self):
     super(GmailComposeDiscardPageSet, self).__init__(
       credentials_path='data/credentials.json',
       user_agent_type='desktop',
       archive_data_file='data/gmail_compose_discard.json')
 
     self.AddPage(GmailComposeDiscardPage(self))