Track event handlers on windows

Source/core/frame/EventHandlerRegistry.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EventHandlerRegistry_h
 #define EventHandlerRegistry_h
 
 #include "core/events/Event.h"
+#include "core/frame/DOMWindowLifecycleObserver.h"
 #include "core/frame/FrameHost.h"
 #include "wtf/HashCountedSet.h"
+#include "wtf/HashMap.h"
 
 namespace WebCore {
 
 typedef HashCountedSet<EventTarget*> EventTargetSet;
 
 // Registry for keeping track of event handlers. Note that only handlers on
 // documents that can be rendered or can receive input (i.e., are attached to a
 // FrameHost) are registered here.
 class EventHandlerRegistry FINAL : public NoBaseWillBeGarbageCollectedFinalized<EventHandlerRegistry> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(EventHandlerRegistry);
@@ skipping 59 matching lines @@
     // Record a change operation to a given event handler class and notify any
     // parent registry and other clients accordingly.
     void updateEventHandlerOfType(ChangeOperation, const AtomicString& eventType, EventTarget*);
 
     void updateEventHandlerInternal(ChangeOperation, EventHandlerClass, EventTarget*);
 
     void updateAllEventHandlers(ChangeOperation, EventTarget&);
 
     void checkConsistency() const;
 
+    class WindowObserver: public DOMWindowLifecycleObserver {
+    public:
+        WindowObserver(EventHandlerRegistry&, DOMWindow&);
+        virtual ~WindowObserver();
+
+        // Inherited from DOMWindowLifecycleObserver
+        virtual void didAddEventListener(DOMWindow*, const AtomicString&) OVERRIDE;
+        virtual void didRemoveEventListener(DOMWindow*, const AtomicString&) OVERRIDE;
+        virtual void didRemoveAllEventListeners(DOMWindow*) OVERRIDE;
+
+    private:
+        EventHandlerRegistry& m_registry;
+    };
+
     FrameHost& m_frameHost;
     EventTargetSet m_targets[EventHandlerClassCount];
+
+    HashMap<DOMWindow*, OwnPtr<WindowObserver> > m_windowObservers;
 };
 
 } // namespace WebCore
 
 #endif // EventHandlerRegistry_h