Fix assertion failure when exception is thrown during keyframe iteration

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 121 matching lines @@
 bool exhaustDictionaryIterator(DictionaryIterator& iterator, ExecutionContext* executionContext, ExceptionState& exceptionState, Vector<Dictionary>& result)
 {
     while (iterator.next(executionContext, exceptionState)) {
         Dictionary dictionary;
         if (!iterator.valueAsDictionary(dictionary, exceptionState)) {
             exceptionState.throwTypeError("Keyframes must be objects.");
             return false;
         }
         result.append(dictionary);
     }
-    return true;
+    return !exceptionState.hadException();
 }
 
 } // namespace
 
 // Spec: http://w3c.github.io/web-animations/#processing-a-frames-argument
 EffectModel* EffectInput::convert(Element* element, const EffectModelOrDictionarySequenceOrDictionary& effectInput, ExecutionContext* executionContext, ExceptionState& exceptionState)
 {
     if (effectInput.isEffectModel())
         return effectInput.getAsEffectModel();
 
@@ skipping 141 matching lines @@
     }
 
     std::sort(keyframes.begin(), keyframes.end(), compareKeyframes);
 
     ASSERT(!exceptionState.hadException());
 
     return createEffectModelFromKeyframes(element, keyframes, encounteredCompositableProperty, exceptionState);
 }
 
 } // namespace blink