Transitively keep track of an isolated world's children scripts and worlds.

third_party/WebKit/Source/core/dom/ScriptLoader.h

Index: third_party/WebKit/Source/core/dom/ScriptLoader.h
diff --git a/third_party/WebKit/Source/core/dom/ScriptLoader.h b/third_party/WebKit/Source/core/dom/ScriptLoader.h
index 6b53a6656812d0dddcb6820ace7ca86db20bc008..32830142676073686c5f15ef2d376332c3b2bd6e 100644
--- a/third_party/WebKit/Source/core/dom/ScriptLoader.h
+++ b/third_party/WebKit/Source/core/dom/ScriptLoader.h
@@ -21,6 +21,7 @@
 #ifndef ScriptLoader_h
 #define ScriptLoader_h
 
+#include "bindings/core/v8/DOMWrapperWorld.h"
 #include "core/CoreExport.h"
 #include "core/dom/PendingScript.h"
 #include "core/fetch/FetchRequest.h"
@@ -104,6 +105,7 @@ private:
 
     RawPtrWillBeMember<Element> m_element;
     ResourcePtr<ScriptResource> m_resource;
+    RefPtr<DOMWrapperWorld> m_originWorld;
     WTF::OrdinalNumber m_startLineNumber;
     String m_characterEncoding;
     String m_fallbackCharacterEncoding;