Add Web Animations performance tests

tools/perf/page_sets/tough_animation_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 ToughAnimationCasesPage(page_module.Page):
 
   def __init__(self, url, page_set, need_measurement_ready):
@@ skipping 85 matching lines @@
       # pylint: disable=C0301
       'file://tough_animation_cases/css_transitions_staggered_triggering_by_inserting_style.html?N=0316',
       # Why: Tests many CSS Transitions starting at different times triggered by
       # updating class.
       # pylint: disable=C0301
       'file://tough_animation_cases/css_transitions_staggered_triggering_by_updating_class.html?N=0316',
       # Why: Tests many CSS Transitions starting at different times triggered by
       # updating inline style.
       # pylint: disable=C0301
       'file://tough_animation_cases/css_transitions_staggered_triggering_by_updating_inline_style.html?N=0316',
+
+      # Why: Tests many Web Animations all starting at the same time with 500
+      # keyframes each.
+      'file://tough_animation_cases/web_animations_many_keyframes.html?N=0316',
+      # Why: Tests many paused Web Animations having their currentTimes updated
+      # in every requestAnimationFrame.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/web_animations_set_current_time_in_raf.html?N=0316',
+      # Why: Tests many Web Animations all starting at the same time.
+      'file://tough_animation_cases/web_animations_simultaneous.html?N=0316',
+      # Why: Tests many Web Animations all starting at different times then
+      # chained together using events.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/web_animations_staggered_chaining.html?N=0316',
+      # Why: Tests many Web Animations all starting at different times with
+      # infinite iterations.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/web_animations_staggered_infinite_iterations.html?N=0316',
+      # Why: Tests many Web Animations all starting at different times.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/web_animations_staggered_triggering.html?N=0316',
     ]
 
     for url in urls_list_one:
       self.AddPage(ToughAnimationCasesPage(url, self,
                                            need_measurement_ready=True))
 
     urls_list_two = [
       # Why: Tests various keyframed animations.
       'file://tough_animation_cases/keyframed_animations.html',
       # Why: Tests various transitions.
       'file://tough_animation_cases/transform_transitions.html',
       # Why: JS execution blocks CSS transition unless initial transform is set.
       'file://tough_animation_cases/transform_transition_js_block.html'
 
       # Disabled: crbug.com/350692
       # Why: Login page is slow because of ineffecient transform operations.
       # 'http://ie.microsoft.com/testdrive/performance/robohornetpro/',
     ]
 
     for url in urls_list_two:
       self.AddPage(ToughAnimationCasesPage(url, self,
                                            need_measurement_ready=False))