bindings: Add validation for enum Sequence or Array

Source/bindings/core/v8/V8Binding.h

Index: Source/bindings/core/v8/V8Binding.h
diff --git a/Source/bindings/core/v8/V8Binding.h b/Source/bindings/core/v8/V8Binding.h
index bd91db5a69109c53e1531e03ef5305a37f005f95..c5abdc3d9fa53cc192360671d54283ce5f8f5875 100644
--- a/Source/bindings/core/v8/V8Binding.h
+++ b/Source/bindings/core/v8/V8Binding.h
@@ -919,6 +919,9 @@ template<class Collection> static void indexedPropertyEnumerator(const v8::Prope
     v8SetReturnValue(info, properties);
 }
 
+bool isValidEnum(const String value, const char** validValues, size_t length, ExceptionState&);
+bool isValidEnum(const Vector<String>& values, const char** validValues, size_t length, ExceptionState&);
+
 // These methods store hidden values into an array that is stored in the internal field of a DOM wrapper.
 void addHiddenValueToArray(v8::Isolate*, v8::Handle<v8::Object>, v8::Local<v8::Value>, int cacheIndex);
 void removeHiddenValueFromArray(v8::Isolate*, v8::Handle<v8::Object>, v8::Local<v8::Value>, int cacheIndex);