Make DOMWrapperWorlds easier to use

Source/bindings/v8/DOMWrapperWorld.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 25 matching lines @@
 #include "V8PerContextData.h"
 #include <v8.h>
 #include <wtf/PassRefPtr.h>
 #include <wtf/RefCounted.h>
 #include <wtf/RefPtr.h>
 #include <wtf/text/WTFString.h>
 
 namespace WebCore {
 
 class DOMDataStore;
+class ScriptExecutionContext;
 
 // This class represent a collection of DOM wrappers for a specific world.
 class DOMWrapperWorld : public RefCounted<DOMWrapperWorld> {
 public:
     static const int mainWorldId = 0;
     static const int mainWorldExtensionGroup = 0;
     static PassRefPtr<DOMWrapperWorld> ensureIsolatedWorld(int worldId, int extensionGroup);
     ~DOMWrapperWorld();
 
     static bool isolatedWorldsExist() { return isolatedWorldCount; }
     static bool isIsolatedWorldId(int worldId) { return worldId > mainWorldId; }
     static void getAllWorlds(Vector<RefPtr<DOMWrapperWorld> >& worlds);
 
     void makeContextWeak(v8::Handle<v8::Context>);
     void setIsolatedWorldField(v8::Handle<v8::Context>);
 
     static DOMWrapperWorld* isolatedWorld(v8::Handle<v8::Context> context)
     {
         ASSERT(contextHasCorrectPrototype(context));
         return static_cast<DOMWrapperWorld*>(context->GetAlignedPointerFromEmbedderData(v8ContextIsolatedWorld));
     }
 
+    // Will return null if there is no DOMWrapperWorld representing the given ScriptExecutionContext.
+    static DOMWrapperWorld* current(ScriptExecutionContext*);
+
     // Associates an isolated world (see above for description) with a security
     // origin. XMLHttpRequest instances used in that world will be considered
     // to come from that origin, not the frame's.
     static void setIsolatedWorldSecurityOrigin(int worldID, PassRefPtr<SecurityOrigin>);
     static void clearIsolatedWorldSecurityOrigin(int worldID);
     SecurityOrigin* isolatedWorldSecurityOrigin();
 
     // Associated an isolated world with a Content Security Policy. Resources
     // embedded into the main world's DOM from script executed in an isolated
     // world should be restricted based on the isolated world's DOM, not the
@@ skipping 41 matching lines @@
 
 DOMWrapperWorld* mainThreadNormalWorld();
 
 // FIXME: this is a workaround for a problem in ScriptController
 // Do not use this anywhere else!!
 DOMWrapperWorld* existingWindowShellWorkaroundWorld();
 
 } // namespace WebCore
 
 #endif // DOMWrapperWorld_h