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

third_party/WebKit/Source/core/animation/EffectInput.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 207 matching lines @@
     if (DictionaryHelper::get(keyframeDictionary, "easing",
                               timingFunctionString)) {
       RefPtr<TimingFunction> timingFunction =
           AnimationInputHelpers::parseTimingFunction(
               timingFunctionString, &element.document(), exceptionState);
       if (!timingFunction)
         return nullptr;
       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") {
         continue;
       }
 
       Vector<String> values;
       if (DictionaryHelper::get(keyframeDictionary, property, values)) {
         exceptionState.throwTypeError(
             "Lists of values not permitted in array-form list of keyframes");
@@ skipping 76 matching lines @@
   Nullable<double> offset;
   if (DictionaryHelper::get(keyframeDictionary, "offset", offset) &&
       !offset.isNull()) {
     if (!checkOffset(offset.get(), 0.0, exceptionState))
       return nullptr;
   }
 
   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") {
       continue;
     }
 
     Vector<String> values;
     if (!getPropertyIndexedKeyframeValues(keyframeDictionary, property,
                                           executionContext, exceptionState,
                                           values))
@@ skipping 23 matching lines @@
   }
 
   std::sort(keyframes.begin(), keyframes.end(), compareKeyframes);
 
   DCHECK(!exceptionState.hadException());
 
   return createEffectModelFromKeyframes(element, keyframes, exceptionState);
 }
 
 }  // namespace blink