Add CSS Animations performance tests

tools/perf/page_sets/tough_animation_cases.py

Index: tools/perf/page_sets/tough_animation_cases.py
diff --git a/tools/perf/page_sets/tough_animation_cases.py b/tools/perf/page_sets/tough_animation_cases.py
index 86ac0e8cb7293da47b2504e51a23b3778eb3a261..b848909067ee8c3a217f7dce9525599a93bd5492 100644
--- a/tools/perf/page_sets/tough_animation_cases.py
+++ b/tools/perf/page_sets/tough_animation_cases.py
@@ -55,10 +55,11 @@ class ToughAnimationCasesPageSet(page_set_module.PageSet):
       'file://tough_animation_cases/balls_css_transition_all_properties.html',
       # pylint: disable=C0301
       'file://tough_animation_cases/overlay_background_color_css_transitions.html',
+
       # Why: Tests many CSS Transitions all starting at the same time triggered
       # by inserting new elements.
       # pylint: disable=C0301
-      'file://tough_animation_cases/css_transitions_simultaneous_by_inserting_new_elements.html?N=0316',
+      'file://tough_animation_cases/css_transitions_simultaneous_by_inserting_new_element.html?N=0316',
       # Why: Tests many CSS Transitions all starting at the same time triggered
       # by inserting style sheets.
       # pylint: disable=C0301
@@ -94,7 +95,7 @@ class ToughAnimationCasesPageSet(page_set_module.PageSet):
       # Why: Tests many CSS Transitions starting at different times triggered by
       # inserting style sheets.
       # pylint: disable=C0301
-      'file://tough_animation_cases/css_transitions_staggered_triggering_by_inserting_style.html?N=0316',
+      'file://tough_animation_cases/css_transitions_staggered_triggering_by_inserting_style_element.html?N=0316',
       # Why: Tests many CSS Transitions starting at different times triggered by
       # updating class.
       # pylint: disable=C0301
@@ -104,6 +105,62 @@ class ToughAnimationCasesPageSet(page_set_module.PageSet):
       # pylint: disable=C0301
       'file://tough_animation_cases/css_transitions_staggered_triggering_by_updating_inline_style.html?N=0316',
 
+      # Why: Tests many CSS Animations all starting at the same time with 500
+      # keyframes each.
+      'file://tough_animation_cases/css_animations_many_keyframes.html?N=0316',
+      # Why: Tests many CSS Animations all starting at the same time triggered
+      # by inserting new elements.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/css_animations_simultaneous_by_inserting_new_element.html?N=0316',
+      # Why: Tests many CSS Animations all starting at the same time triggered
+      # by inserting style sheets.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/css_animations_simultaneous_by_inserting_style_element.html?N=0316',
+      # Why: Tests many CSS Animations all starting at the same time triggered
+      # by updating class.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/css_animations_simultaneous_by_updating_class.html?N=0316',
+      # Why: Tests many CSS Animations all starting at the same time triggered
+      # by updating inline style.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/css_animations_simultaneous_by_updating_inline_style.html?N=0316',
+      # Why: Tests many CSS Animations chained together using events at
+      # different times triggered by inserting new elements.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/css_animations_staggered_chaining_by_inserting_new_element.html?N=0316',
+      # Why: Tests many CSS Animations chained together using events at
+      # different times triggered by inserting style sheets.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/css_animations_staggered_chaining_by_inserting_style_element.html?N=0316',
+      # Why: Tests many CSS Animations chained together using events at
+      # different times triggered by updating class.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/css_animations_staggered_chaining_by_updating_class.html?N=0316',
+      # Why: Tests many CSS Animations chained together using events at
+      # different times triggered by updating inline style.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/css_animations_staggered_chaining_by_updating_inline_style.html?N=0316',
+      # Why: Tests many CSS Animations starting at different times triggered by
+      # inserting new elements.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/css_animations_staggered_triggering_by_inserting_new_element.html?N=0316',
+      # Why: Tests many CSS Animations all starting at the same time with
+      # staggered animation offsets.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/css_animations_staggered_infinite_iterations.html?N=0316',
+      # Why: Tests many CSS Animations starting at different times triggered by
+      # inserting style sheets.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/css_animations_staggered_triggering_by_inserting_style_element.html?N=0316',
+      # Why: Tests many CSS Animations starting at different times triggered by
+      # updating class.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/css_animations_staggered_triggering_by_updating_class.html?N=0316',
+      # Why: Tests many CSS Animations starting at different times triggered by
+      # updating inline style.
+      # pylint: disable=C0301
+      'file://tough_animation_cases/css_animations_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',