Migrate blink_perf.animation mix-blend-mode-* to smoothness.tough_animation_cases

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 223 matching lines @@
     for url in urls_list_one:
       self.AddUserStory(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'
+      'file://tough_animation_cases/transform_transition_js_block.html',
+      # Why: Tests animating elements having mix-blend-mode: difference (a
+      # separable popular blend mode).
+      'file://tough_animation_cases/mix_blend_mode_animation_difference.html',
+      # Why: Tests animating elements having mix-blend-mode: hue (a
+      # non-separable blend mode).
+      'file://tough_animation_cases/mix_blend_mode_animation_hue.html',
+      # Why: Tests animating elements having mix-blend-mode: screen.
+      'file://tough_animation_cases/mix_blend_mode_animation_screen.html',
+      # Why: Tests software-animating a deep DOM subtree having one blending
+      # leaf.
+      'file://tough_animation_cases/mix_blend_mode_propagating_isolation.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.AddUserStory(ToughAnimationCasesPage(url, self,
                                            need_measurement_ready=False))