[WIP] bindings: Introduce PropertyBag

Source/bindings/tests/results/V8TestInterfaceWillBeGarbageCollected.h

Index: Source/bindings/tests/results/V8TestInterfaceWillBeGarbageCollected.h
diff --git a/Source/bindings/tests/results/V8TestInterfaceWillBeGarbageCollected.h b/Source/bindings/tests/results/V8TestInterfaceWillBeGarbageCollected.h
index 7070e8eb9ac141f85b8d02b955c9c19e3837e770..a7a36899719dfaaa64c4a795d4e9fa95a21d37f0 100644
--- a/Source/bindings/tests/results/V8TestInterfaceWillBeGarbageCollected.h
+++ b/Source/bindings/tests/results/V8TestInterfaceWillBeGarbageCollected.h
@@ -7,6 +7,7 @@
 #ifndef V8TestInterfaceWillBeGarbageCollected_h
 #define V8TestInterfaceWillBeGarbageCollected_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"
@@ -140,5 +141,10 @@ inline void v8SetReturnValueFast(const CallbackInfo& callbackInfo, PassRefPtrWil
     v8SetReturnValueFast(callbackInfo, impl.get(), wrappable);
 }
 
+template <>
+struct PropertyBagTraits<TestInterfaceWillBeGarbageCollected> {
+    typedef V8TestInterfaceWillBeGarbageCollected type;
+};
+
 } // namespace blink
 #endif // V8TestInterfaceWillBeGarbageCollected_h