Devtools Animations: Add cubic bezier easing editor for animations

Source/core/inspector/InspectorAnimationAgent.cpp

Index: Source/core/inspector/InspectorAnimationAgent.cpp
diff --git a/Source/core/inspector/InspectorAnimationAgent.cpp b/Source/core/inspector/InspectorAnimationAgent.cpp
index 04e20c6640ab6649fd95445f158d532025763a93..e4c68874b2baa4eef4d20ab1201a393bfc6b59c4 100644
--- a/Source/core/inspector/InspectorAnimationAgent.cpp
+++ b/Source/core/inspector/InspectorAnimationAgent.cpp
@@ -9,6 +9,7 @@
 #include "core/animation/Animation.h"
 #include "core/animation/AnimationEffect.h"
 #include "core/animation/AnimationEffectTiming.h"
+#include "core/animation/AnimationInputHelpers.h"
 #include "core/animation/ComputedTimingProperties.h"
 #include "core/animation/EffectModel.h"
 #include "core/animation/ElementAnimation.h"
@@ -225,6 +226,18 @@ void InspectorAnimationAgent::setCurrentTime(ErrorString*, double currentTime)
     }
 }
 
+static KeyframeVector cloneTransitionFrames(KeyframeEffectModelBase* model)
+{
+    const AnimatableValueKeyframeEffectModel* oldModel = toAnimatableValueKeyframeEffectModel(model);
+    // Refer to CSSAnimations::calculateTransitionUpdateForProperty() for the structure of transitions.
+    const KeyframeVector& frames = oldModel->getFrames();
+    ASSERT(frames.size() == 3);
+    KeyframeVector newFrames;
+    for (int i = 0; i < 3; i++)
+        newFrames.append(toAnimatableValueKeyframe(frames[i]->clone().get()));
+    return newFrames;
+}
+
 void InspectorAnimationAgent::setTiming(ErrorString* errorString, const String& playerId, double duration, double delay)
 {
     Animation* animation = assertAnimation(errorString, playerId);
@@ -235,13 +248,7 @@ void InspectorAnimationAgent::setTiming(ErrorString* errorString, const String&
     if (type == AnimationType::CSSTransition) {
         KeyframeEffect* effect = toKeyframeEffect(animation->source());
         KeyframeEffectModelBase* model = toKeyframeEffectModelBase(effect->model());
-        const AnimatableValueKeyframeEffectModel* oldModel = toAnimatableValueKeyframeEffectModel(model);
-        // Refer to CSSAnimations::calculateTransitionUpdateForProperty() for the structure of transitions.
-        const KeyframeVector& frames = oldModel->getFrames();
-        ASSERT(frames.size() == 3);
-        KeyframeVector newFrames;
-        for (int i = 0; i < 3; i++)
-            newFrames.append(toAnimatableValueKeyframe(frames[i]->clone().get()));
+        KeyframeVector newFrames = cloneTransitionFrames(model);
         // Update delay, represented by the distance between the first two keyframes.
         newFrames[1]->setOffset(delay / (delay + duration));
         model->setFrames(newFrames);
@@ -256,6 +263,35 @@ void InspectorAnimationAgent::setTiming(ErrorString* errorString, const String&
         unrestrictedDuration.setUnrestrictedDouble(duration);
         timing->setDuration(unrestrictedDuration);
         timing->setDelay(delay);
+    } else {
+        *errorString = "Given animation is not a transition or web animation.";
+    }
+}
+
+void InspectorAnimationAgent::setEasing(ErrorString* errorString, const String& playerId, const String& easing)
+{
+    Animation* animation = assertAnimation(errorString, playerId);
+    if (!animation)
+        return;
+
+    AnimationType type = m_idToAnimationType.get(playerId);
+    if (type == AnimationType::CSSTransition) {
+        KeyframeEffect* effect = toKeyframeEffect(animation->source());
+        KeyframeEffectModelBase* model = toKeyframeEffectModelBase(effect->model());
+        KeyframeVector newFrames = cloneTransitionFrames(model);
+        // Update easing of the transition, represented by the second keyframe.
+        if (RefPtr<TimingFunction> timingFunction = AnimationInputHelpers::parseTimingFunction(easing)) {
+            newFrames[1]->setEasing(timingFunction);
+        } else {
+            *errorString = "Could not parse timing function.";
+            return;
+        }
+        model->setFrames(newFrames);
+    } else if (type == AnimationType::WebAnimation) {
+        RefPtrWillBeRawPtr<AnimationEffectTiming> timing = animation->source()->timing();
+        timing->setEasing(easing);
+    } else {
+        *errorString = "Given animation is not a transition or web animation.";
     }
 }