Fix assertion failure when exception is thrown during keyframe iteration

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 d5226762ec115b23b84e980c7cddc96153edd4c8..fe5944dc6b59fdaea1c53b484870a0dab38d5012 100644
--- a/third_party/WebKit/Source/core/animation/EffectInput.cpp
+++ b/third_party/WebKit/Source/core/animation/EffectInput.cpp
@@ -139,7 +139,7 @@ bool exhaustDictionaryIterator(DictionaryIterator& iterator, ExecutionContext* e
         }
         result.append(dictionary);
     }
-    return true;
+    return !exceptionState.hadException();
 }
 
 } // namespace