[WIP] bindings: Introduce PropertyBag

Source/bindings/tests/results/V8SVGTestInterface.h

Index: Source/bindings/tests/results/V8SVGTestInterface.h
diff --git a/Source/bindings/tests/results/V8SVGTestInterface.h b/Source/bindings/tests/results/V8SVGTestInterface.h
index 072e16bdc72e882e16ad5ac81655d4cae8f8a206..2757845ad932d6c89d70f7989e9bea6842067400 100644
--- a/Source/bindings/tests/results/V8SVGTestInterface.h
+++ b/Source/bindings/tests/results/V8SVGTestInterface.h
@@ -7,6 +7,7 @@
 #ifndef V8SVGTestInterface_h
 #define V8SVGTestInterface_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"
@@ -125,5 +126,10 @@ inline void v8SetReturnValueFast(const CallbackInfo& callbackInfo, PassRefPtr<SV
     v8SetReturnValueFast(callbackInfo, impl.get(), wrappable);
 }
 
+template <>
+struct PropertyBagTraits<SVGTestInterface> {
+    typedef V8SVGTestInterface type;
+};
+
 } // namespace blink
 #endif // V8SVGTestInterface_h