[WIP] bindings: Introduce PropertyBag

Source/bindings/core/v8/PropertyBagTraits.h

Index: Source/bindings/core/v8/PropertyBagTraits.h
diff --git a/Source/core/frame/NavigatorCPU.h b/Source/bindings/core/v8/PropertyBagTraits.h
similarity index 59%
copy from Source/core/frame/NavigatorCPU.h
copy to Source/bindings/core/v8/PropertyBagTraits.h
index 84d4f58244d3d832e20d703fd8a9d09cf344b303..9d3aa5e1f5b1db3070d6185b50bcbc8425dc3f65 100644
--- a/Source/core/frame/NavigatorCPU.h
+++ b/Source/bindings/core/v8/PropertyBagTraits.h
@@ -2,16 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef NavigatorCPU_h
-#define NavigatorCPU_h
+#ifndef PropertyBagTraits_h
+#define PropertyBagTraits_h
 
 namespace blink {
 
-class NavigatorCPU {
-public:
-    unsigned hardwareConcurrency() const;
-};
+template <typename T> struct PropertyBagTraits;
 
 } // namespace blink
 
-#endif // NavigatorCPU_h
+#endif // PropertyBagTraits_h