Implement an infrastructure of Blink-in-JS

Source/bindings/v8/DOMWrapperWorld.cpp

Index: Source/bindings/v8/DOMWrapperWorld.cpp
diff --git a/Source/bindings/v8/DOMWrapperWorld.cpp b/Source/bindings/v8/DOMWrapperWorld.cpp
index 59cb45057160775643fe75f51d4c11de065e7de5..4633cb5a92ae43ce4708c314ac676689ddebe9e0 100644
--- a/Source/bindings/v8/DOMWrapperWorld.cpp
+++ b/Source/bindings/v8/DOMWrapperWorld.cpp
@@ -67,6 +67,19 @@ DOMWrapperWorld& DOMWrapperWorld::mainWorld()
     return *cachedMainWorld;
 }
 
+DOMWrapperWorld& DOMWrapperWorld::privateScriptWorld()
+{
+    ASSERT(isMainThread());
+    DEFINE_STATIC_LOCAL(RefPtr<DOMWrapperWorld>, cachedPrivateScriptWorld, ());
+    DEFINE_STATIC_LOCAL(bool, isInitialized, (false));
+    if (!isInitialized) {
+        isInitialized = true;
+        cachedPrivateScriptWorld = DOMWrapperWorld::create(PrivateScriptIsolatedWorldId, privateScriptIsolatedWorldExtensionGroup);
+        isolatedWorldCount++;
+    }
+    return *cachedPrivateScriptWorld;
+}
+
 typedef HashMap<int, DOMWrapperWorld*> WorldMap;
 static WorldMap& isolatedWorldMap()
 {