Revert r189385 "Remove LifecycleContext" and r189391, r189530, r189456 that block it

Source/core/dom/DocumentLifecycleNotifier.h

 /*
  * Copyright (C) 2013 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DocumentLifecycleNotifier_h
 #define DocumentLifecycleNotifier_h
 
-#include "platform/LifecycleNotifier.h"
-#include "wtf/HashSet.h"
+#include "core/dom/Document.h"
+#include "core/dom/DocumentLifecycleObserver.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/TemporaryChange.h"
 
 namespace blink {
 
-class Document;
-class DocumentLifecycleObserver;
-
 class DocumentLifecycleNotifier : public LifecycleNotifier<Document> {
 public:
+    static PassOwnPtr<DocumentLifecycleNotifier> create(Document*);
+
     void notifyDocumentWasDetached();
 #if !ENABLE(OILPAN)
     void notifyDocumentWasDisposed();
 #endif
 
     virtual void addObserver(Observer*) override final;
     virtual void removeObserver(Observer*) override final;
 
-protected:
+private:
     explicit DocumentLifecycleNotifier(Document*);
 
-private:
     using DocumentObserverSet = HashSet<DocumentLifecycleObserver*>;
     DocumentObserverSet m_documentObservers;
 };
 
+inline PassOwnPtr<DocumentLifecycleNotifier> DocumentLifecycleNotifier::create(Document* document)
+{
+    return adoptPtr(new DocumentLifecycleNotifier(document));
+}
+
+inline void DocumentLifecycleNotifier::notifyDocumentWasDetached()
+{
+    TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverDocumentObservers);
+    for (DocumentLifecycleObserver* observer : m_documentObservers)
+        observer->documentWasDetached();
+}
+
+#if !ENABLE(OILPAN)
+inline void DocumentLifecycleNotifier::notifyDocumentWasDisposed()
+{
+    TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverDocumentObservers);
+    for (DocumentLifecycleObserver* observer : m_documentObservers)
+        observer->documentWasDisposed();
+}
+#endif
+
 } // namespace blink
 
 #endif // DocumentLifecycleNotifier_h