[Telemetry] Add labels attribute to page as the new way to set label

tools/perf/page_sets/key_mobile_sites.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.
 from telemetry.page import page as page_module
 from telemetry.page import page_set as page_set_module
 
 
 class KeyMobileSitesPage(page_module.Page):
 
-  def __init__(self, url, page_set, name=''):
+  def __init__(self, url, page_set, name='', labels=None):
     super(KeyMobileSitesPage, self).__init__(
         url=url, page_set=page_set, name=name,
-        credentials_path='data/credentials.json')
+        credentials_path='data/credentials.json', labels=labels)
     self.user_agent_type = 'mobile'
     self.archive_data_file = 'data/key_mobile_sites.json'
 
   def RunSmoothness(self, action_runner):
     interaction = action_runner.BeginGestureInteraction(
         'ScrollAction', is_smooth=True)
     action_runner.ScrollPage()
     interaction.End()
 
   def RunRepaint(self, action_runner):
     action_runner.RepaintContinuously(seconds=5)
 
 
 class Page1(KeyMobileSitesPage):
 
   """ Why: Top news site """
 
   def __init__(self, page_set):
     super(Page1, self).__init__(
-      url='http://nytimes.com/',
-      page_set=page_set)
-
-    self.fastpath = True
+      url='http://nytimes.com/', page_set=page_set, labels=['fastpath'])
 
 
 class Page2(KeyMobileSitesPage):
 
   """ Why: Typical mobile business site """
 
   def __init__(self, page_set):
     super(Page2, self).__init__(
       url=('http://iphone.capitolvolkswagen.com/index.htm'
            '#new-inventory_p_2Fsb-new_p_2Ehtm_p_3Freset_p_3DInventoryListing'),
       page_set=page_set)
 
   def RunNavigateSteps(self, action_runner):
     action_runner.NavigateToPage(self)
     action_runner.WaitForElement(text='Next 35')
     action_runner.WaitForJavaScriptCondition(
         'document.body.scrollHeight > 2560')
 
 
 class Page3(KeyMobileSitesPage):
 
   """ Why: Image-heavy site """
 
   def __init__(self, page_set):
     super(Page3, self).__init__(
-      url='http://cuteoverload.com',
-      page_set=page_set)
-
-    self.fastpath = True
+      url='http://cuteoverload.com', page_set=page_set, labels=['fastpath'])
 
 
 class Page4(KeyMobileSitesPage):
 
   """ Why: Top tech blog """
 
   def __init__(self, page_set):
     super(Page4, self).__init__(
       # pylint: disable=C0301
       url='http://www.theverge.com/2012/10/28/3568746/amazon-7-inch-fire-hd-ipad-mini-ad-ballsy',
@@ skipping 205 matching lines @@
     interaction.End()
 
 
 class Page18(KeyMobileSitesPage):
 
   """ Why: crbug.com/169827 """
 
   def __init__(self, page_set):
     super(Page18, self).__init__(
       url='http://slashdot.org/',
-      page_set=page_set)
-
-    self.fastpath = True
+      page_set=page_set, labels=['fastpath'])
 
 
 class Page19(KeyMobileSitesPage):
 
   """ Why: #5 Alexa news """
 
   def __init__(self, page_set):
     super(Page19, self).__init__(
       url='http://www.reddit.com/r/programming/comments/1g96ve',
-      page_set=page_set)
-
-    self.fastpath = True
+      page_set=page_set, labels=['fastpath'])
 
 
 class Page20(KeyMobileSitesPage):
 
   """ Why: Problematic use of fixed position elements """
 
   def __init__(self, page_set):
     super(Page20, self).__init__(
-      url='http://www.boingboing.net',
-      page_set=page_set)
-
-    self.fastpath = True
+      url='http://www.boingboing.net', page_set=page_set, labels=['fastpath'])
 
 
 class Page21(KeyMobileSitesPage):
 
   """ Why: crbug.com/172906 """
 
   def __init__(self, page_set):
     super(Page21, self).__init__(
       url='http://groupcloned.com',
       page_set=page_set)
@@ skipping 210 matching lines @@
       ('http://www.baidu.com/s?wd=barack+obama&rsv_bp=0&rsv_spt=3&rsv_sug3=9&'
        'rsv_sug=0&rsv_sug4=3824&rsv_sug1=3&inputT=4920'),
       # Why: Top search engine
       'http://www.bing.com/search?q=sloths',
       # Why: Good example of poor initial scrolling
       'http://ftw.usatoday.com/2014/05/spelling-bee-rules-shenanigans'
     ]
 
     for url in urls_list:
       self.AddPage(KeyMobileSitesPage(url, self))