Throw TypeError if easing string is invalid.

third_party/WebKit/Source/core/animation/EffectInput.cpp

Index: third_party/WebKit/Source/core/animation/EffectInput.cpp
diff --git a/third_party/WebKit/Source/core/animation/EffectInput.cpp b/third_party/WebKit/Source/core/animation/EffectInput.cpp
index 49038de6848d2b713f742645c3fc755e63816cea..4d60a9b25c48be9ce4897cba04147fad94b607d6 100644
--- a/third_party/WebKit/Source/core/animation/EffectInput.cpp
+++ b/third_party/WebKit/Source/core/animation/EffectInput.cpp
@@ -125,6 +125,7 @@ EffectModel* createEffectModelFromKeyframes(Element& element, const StringKeyfra
     }
     keyframeEffectModel->forceConversionsToAnimatableValues(element, element.computedStyle());
 
+    ASSERT(!exceptionState.hadException());
     return keyframeEffectModel;
 }
 
@@ -196,8 +197,10 @@ EffectModel* EffectInput::convertArrayForm(Element& element, const Vector<Dictio
 
         String timingFunctionString;
         if (DictionaryHelper::get(keyframeDictionary, "easing", timingFunctionString)) {
-            if (RefPtr<TimingFunction> timingFunction = AnimationInputHelpers::parseTimingFunction(timingFunctionString, &element.document()))
-                keyframe->setEasing(timingFunction);
+            RefPtr<TimingFunction> timingFunction = AnimationInputHelpers::parseTimingFunction(timingFunctionString, &element.document(), exceptionState);
+            if (!timingFunction)
+                return nullptr;
+            keyframe->setEasing(timingFunction);
         }
 
         Vector<String> keyframeProperties;
@@ -223,8 +226,7 @@ EffectModel* EffectInput::convertArrayForm(Element& element, const Vector<Dictio
         keyframes.append(keyframe);
     }
 
-    if (exceptionState.hadException())
-        return nullptr;
+    ASSERT(!exceptionState.hadException());
 
     return createEffectModelFromKeyframes(element, keyframes, encounteredCompositableProperty, exceptionState);
 }
@@ -236,8 +238,11 @@ EffectModel* EffectInput::convertObjectForm(Element& element, const Dictionary&
 
     String timingFunctionString;
     RefPtr<TimingFunction> timingFunction = nullptr;
-    if (DictionaryHelper::get(keyframeDictionary, "easing", timingFunctionString))
-        timingFunction = AnimationInputHelpers::parseTimingFunction(timingFunctionString, &element.document());
+    if (DictionaryHelper::get(keyframeDictionary, "easing", timingFunctionString)) {
+        timingFunction = AnimationInputHelpers::parseTimingFunction(timingFunctionString, &element.document(), exceptionState);
+        if (!timingFunction)
+            return nullptr;
+    }
 
     ScriptValue scriptValue;
     bool frameHasOffset = DictionaryHelper::get(keyframeDictionary, "offset", scriptValue) && !scriptValue.isNull();
@@ -290,6 +295,8 @@ EffectModel* EffectInput::convertObjectForm(Element& element, const Dictionary&
 
     std::sort(keyframes.begin(), keyframes.end(), compareKeyframes);
 
+    ASSERT(!exceptionState.hadException());
+
     return createEffectModelFromKeyframes(element, keyframes, encounteredCompositableProperty, exceptionState);
 }