binding: Lets Dictionary::getPropertyNames, etc. rethrow an exception.

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 2da614f5f0e7a4f763d7b93dc052ebdfc05962a9..de94a0e09c52e69baf446e2e00bf9ee089a1c62b 100644
--- a/third_party/WebKit/Source/core/animation/EffectInput.cpp
+++ b/third_party/WebKit/Source/core/animation/EffectInput.cpp
@@ -225,8 +225,10 @@ EffectModel* EffectInput::convertArrayForm(
       keyframe->setEasing(timingFunction);
     }
 
-    Vector<String> keyframeProperties;
-    keyframeDictionary.getPropertyNames(keyframeProperties);
+    const Vector<String>& keyframeProperties =
+        keyframeDictionary.getPropertyNames(exceptionState);
+    if (exceptionState.hadException())
+      return nullptr;
     for (const auto& property : keyframeProperties) {
       if (property == "offset" || property == "composite" ||
           property == "easing") {
@@ -323,8 +325,10 @@ EffectModel* EffectInput::convertObjectForm(
   String compositeString;
   DictionaryHelper::get(keyframeDictionary, "composite", compositeString);
 
-  Vector<String> keyframeProperties;
-  keyframeDictionary.getPropertyNames(keyframeProperties);
+  const Vector<String>& keyframeProperties =
+      keyframeDictionary.getPropertyNames(exceptionState);
+  if (exceptionState.hadException())
+    return nullptr;
   for (const auto& property : keyframeProperties) {
     if (property == "offset" || property == "composite" ||
         property == "easing") {