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..46e2ff55fd632e064d7216c18a7703ec1ee4164e 100644
--- a/third_party/WebKit/Source/core/animation/EffectInput.cpp
+++ b/third_party/WebKit/Source/core/animation/EffectInput.cpp
@@ -226,7 +226,10 @@ EffectModel* EffectInput::convertArrayForm(
     }
 
     Vector<String> keyframeProperties;
-    keyframeDictionary.getPropertyNames(keyframeProperties);
+    if (!keyframeDictionary.getPropertyNames(keyframeProperties,
+                                             exceptionState)) {
+      return nullptr;
+    }
     for (const auto& property : keyframeProperties) {
       if (property == "offset" || property == "composite" ||
           property == "easing") {
@@ -324,7 +327,8 @@ EffectModel* EffectInput::convertObjectForm(
   DictionaryHelper::get(keyframeDictionary, "composite", compositeString);
 
   Vector<String> keyframeProperties;
-  keyframeDictionary.getPropertyNames(keyframeProperties);
+  if (!keyframeDictionary.getPropertyNames(keyframeProperties, exceptionState))
+    return nullptr;
   for (const auto& property : keyframeProperties) {
     if (property == "offset" || property == "composite" ||
         property == "easing") {