[WIP] bindings: Introduce PropertyBag

Source/bindings/tests/results/V8TestInterface3.h

Index: Source/bindings/tests/results/V8TestInterface3.h
diff --git a/Source/bindings/tests/results/V8TestInterface3.h b/Source/bindings/tests/results/V8TestInterface3.h
index 8dd95f3082adf98f40c8236c4c1bb0263e87f257..9f8e0a47ebb0109f48f1ece1f8a2d3d119671b1f 100644
--- a/Source/bindings/tests/results/V8TestInterface3.h
+++ b/Source/bindings/tests/results/V8TestInterface3.h
@@ -7,6 +7,7 @@
 #ifndef V8TestInterface3_h
 #define V8TestInterface3_h
 
+#include "bindings/core/v8/PropertyBagTraits.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8DOMWrapper.h"
@@ -134,5 +135,10 @@ inline void v8SetReturnValueFast(const CallbackInfo& callbackInfo, PassRefPtr<Te
     v8SetReturnValueFast(callbackInfo, impl.get(), wrappable);
 }
 
+template <>
+struct PropertyBagTraits<TestInterface3> {
+    typedef V8TestInterface3 type;
+};
+
 } // namespace blink
 #endif // V8TestInterface3_h