Fix and re-enable v8.top_25_smooth

tools/perf/page_sets/top_25_smooth.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
 
 from page_sets import top_pages
 
 
 def _IssueMarkerAndScroll(action_runner):
@@ skipping 145 matching lines @@
 
   def __init__(self):
     super(Top25SmoothPageSet, self).__init__(
         user_agent_type='desktop',
         archive_data_file='data/top_25_smooth.json',
         bucket=page_set_module.PARTNER_BUCKET)
 
     self.AddUserStory(_CreatePageClassWithSmoothInteractions(
         top_pages.GoogleWebSearchPage)(self))
     self.AddUserStory(GmailSmoothPage(self))
-    # crbug.com/465446
-    # self.AddUserStory(GmailMouseScrollPage(self))
+    self.AddUserStory(GmailMouseScrollPage(self))
     self.AddUserStory(GoogleCalendarSmoothPage(self))
     self.AddUserStory(_CreatePageClassWithSmoothInteractions(
         top_pages.GoogleImageSearchPage)(self))
     self.AddUserStory(GoogleDocSmoothPage(self))
     self.AddUserStory(_CreatePageClassWithSmoothInteractions(
         top_pages.GooglePlusPage)(self))
     self.AddUserStory(_CreatePageClassWithSmoothInteractions(
         top_pages.YoutubePage)(self))
     self.AddUserStory(_CreatePageClassWithSmoothInteractions(
         top_pages.BlogspotPage)(self))
@@ skipping 31 matching lines @@
         # Why: #1 Alexa reference
         'http://answers.yahoo.com',
         # Why: #1 Alexa sports
         'http://sports.yahoo.com/',
         # Why: top tech blog
         'http://techcrunch.com'
     ]
 
     for url in other_urls:
       self.AddUserStory(TopSmoothPage(url, self))