Add callbacks to ScriptCustomElementDefinition

third_party/WebKit/Source/bindings/core/v8/V8Binding.h

Index: third_party/WebKit/Source/bindings/core/v8/V8Binding.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8Binding.h b/third_party/WebKit/Source/bindings/core/v8/V8Binding.h
index 775169767355d1d4723ef39e694b5d40de8bb3d4..ca221f4eeb16016c698808cae9c26e2ad3454cdb 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8Binding.h
+++ b/third_party/WebKit/Source/bindings/core/v8/V8Binding.h
@@ -775,6 +775,17 @@ struct NativeValueTraits<String> {
 };
 
 template<>
+struct NativeValueTraits<AtomicString> {
+    static inline String nativeValue(v8::Isolate* isolate, v8::Local<v8::Value> value, ExceptionState& exceptionState)

[haraken, 2016/06/06 01:39:15]

Why do you want to return a String for NativeValueTraits<AtomicString>?
Shouldn't this return an AtomicString?

[kojii, 2016/06/06 11:12:35]

Done, that was typo, thank you for catching.

+    {
+        V8StringResource<> stringValue(value);
+        if (!stringValue.prepare(exceptionState))
+            return String();
+        return stringValue;
+    }
+};
+
+template<>
 struct NativeValueTraits<int> {
     static inline int nativeValue(v8::Isolate* isolate, v8::Local<v8::Value> value, ExceptionState& exceptionState)
     {