Move asserts for tracking global object detachment to WindowProxy.

third_party/WebKit/Source/bindings/core/v8/WindowProxy.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 150 matching lines @@
 
   virtual void initialize() = 0;
 
   enum GlobalDetachmentBehavior { DoNotDetachGlobal, DetachGlobal };
   virtual void disposeContext(GlobalDetachmentBehavior) = 0;
 
   v8::Isolate* isolate() const { return m_isolate; }
   Frame* frame() const { return m_frame.get(); }
   ScriptState* getScriptState() const { return m_scriptState.get(); }
 
+#if DCHECK_IS_ON()
+  void didAttachGlobalObject() { m_isGlobalObjectAttached = true; }
+  void didDetachGlobalObject() { m_isGlobalObjectAttached = false; }
+#endif
+
  private:
   v8::Isolate* const m_isolate;
   const Member<Frame> m_frame;
+#if DCHECK_IS_ON()
+  bool m_isGlobalObjectAttached = false;
+#endif
 
  protected:
   // TODO(dcheng): Move this to LocalWindowProxy once RemoteWindowProxy uses
   // remote contexts.
   RefPtr<ScriptState> m_scriptState;
   // TODO(dcheng): Consider making these private and using getters.
   const RefPtr<DOMWrapperWorld> m_world;
   ScopedPersistent<v8::Object> m_globalProxy;
   Lifecycle m_lifecycle;
 };
 
 }  // namespace blink
 
 #endif  // WindowProxy_h