tools: Add tough_fast_scrolling_cases page set.

tools/perf/page_sets/tough_scrolling_cases.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 ToughScrollingCasesPage(page_module.Page):
 
   def __init__(self, url, page_set):
     super(ToughScrollingCasesPage, self).__init__(url=url, page_set=page_set)
 
   def RunSmoothness(self, action_runner):
     interaction = action_runner.BeginGestureInteraction(
         'ScrollAction', is_smooth=True)
     action_runner.ScrollPage()
     interaction.End()
 
+class ToughFastScrollingCasesPage(page_module.Page):
+
+  def __init__(self, url, page_set):
+    super(ToughFastScrollingCasesPage, self).__init__(
+      url=url,
+      page_set=page_set,
+      labels=['fastscrolling'])
+
+  def RunSmoothness(self, action_runner):
+    interaction = action_runner.BeginGestureInteraction(
+        'ScrollAction', is_smooth=True)
+    action_runner.ScrollPage(direction='down', speed_in_pixels_per_second=16000)
+    interaction.End()
 
 class ToughScrollingCasesPageSet(page_set_module.PageSet):
 
   """
   Description: A collection of difficult scrolling tests
   """
 
   def __init__(self):
     super(ToughScrollingCasesPageSet, self).__init__()
 
     urls_list = [
       'file://tough_scrolling_cases/background_fixed.html',
       'file://tough_scrolling_cases/cust_scrollbar.html',
       'file://tough_scrolling_cases/div_scrolls.html',
       'file://tough_scrolling_cases/fixed_nonstacking.html',
       'file://tough_scrolling_cases/fixed_stacking.html',
       'file://tough_scrolling_cases/iframe_scrolls.html',
       'file://tough_scrolling_cases/simple.html',
       'file://tough_scrolling_cases/wheel_body_prevdefault.html',
       'file://tough_scrolling_cases/wheel_div_prevdefault.html'
     ]
 
     for url in urls_list:
       self.AddPage(ToughScrollingCasesPage(url, self))
 
+    fast_scrolling_urls_list = [
+      'file://tough_scrolling_cases/lorem_ipsum.html',
+      'file://tough_scrolling_cases/canvas.html',
+    ]
+
+    for url in fast_scrolling_urls_list:
+      self.AddPage(ToughFastScrollingCasesPage(url, self))