Devtools Animations: Add cubic bezier easing editor for animations

Source/core/animation/AnimationEffect.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 74 matching lines @@
     const double result = m_timing.playbackRate
         ? repeatedDuration() / std::abs(m_timing.playbackRate)
         : std::numeric_limits<double>::infinity();
     ASSERT(result >= 0);
     return result;
 }
 
 void AnimationEffect::updateSpecifiedTiming(const Timing& timing)
 {
     // FIXME: Test whether the timing is actually different?
-    if (m_timing == timing)
-        return;
     m_timing = timing;
     invalidate();
     if (m_animation)
         m_animation->setOutdated();
     specifiedTimingChanged();
     if (m_animation)
         InspectorInstrumentation::animationTimingUpdated(m_animation->timeline()->document(), m_animation);
 }
 
 void AnimationEffect::computedTiming(ComputedTimingProperties& computedTiming)
@@ skipping 126 matching lines @@
 }
 
 DEFINE_TRACE(AnimationEffect)
 {
     visitor->trace(m_parent);
     visitor->trace(m_animation);
     visitor->trace(m_eventDelegate);
 }
 
 } // namespace blink