Add a lifecycle state machine for Document

Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 15 matching lines @@
  */
 
 #ifndef Document_h
 #define Document_h
 
 #include "bindings/v8/ScriptValue.h"
 #include "core/dom/ContainerNode.h"
 #include "core/dom/CustomElement.h"
 #include "core/dom/DOMTimeStamp.h"
 #include "core/dom/DocumentInit.h"
+#include "core/dom/DocumentLifecycle.h"
 #include "core/dom/DocumentTiming.h"
 #include "core/dom/IconURL.h"
 #include "core/dom/MutationObserver.h"
 #include "core/dom/QualifiedName.h"
 #include "core/dom/ScriptExecutionContext.h"
 #include "core/dom/TextLinkColors.h"
 #include "core/dom/TreeScope.h"
 #include "core/dom/UserActionElementSet.h"
 #include "core/dom/ViewportArguments.h"
+#include "core/events/DocumentEventQueue.h"
 #include "core/html/CollectionType.h"
 #include "core/page/FocusDirection.h"
 #include "core/page/PageVisibilityState.h"
-#include "weborigin/ReferrerPolicy.h"
 #include "core/platform/Timer.h"
 #include "core/rendering/HitTestRequest.h"
+#include "weborigin/ReferrerPolicy.h"
 #include "wtf/HashSet.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/WeakPtr.h"
 
 namespace WebCore {
 
 class AXObjectCache;
 class Attr;
@@ skipping 989 matching lines @@
 
     void didAssociateFormControl(Element*);
 
     void addConsoleMessageWithRequestIdentifier(MessageSource, MessageLevel, const String& message, unsigned long requestIdentifier);
 
     virtual DOMWindow* executingWindow() OVERRIDE { return domWindow(); }
     virtual void userEventWasHandled() OVERRIDE { resetLastHandledUserGestureTimestamp(); }
 
     PassRefPtr<FontFaceSet> fonts();
     DocumentLifecycleNotifier* lifecycleNotifier();
+    bool isActive() const { return m_lifecyle.state() == DocumentLifecycle::Active; }
 
     enum HttpRefreshType {
         HttpRefreshFromHeader,
         HttpRefreshFromMetaTag
     };
     void maybeHandleHttpRefresh(const String&, HttpRefreshType);
 
 protected:
     Document(const DocumentInit&, DocumentClassFlags = DefaultDocumentClass);
 
@@ skipping 74 matching lines @@
 
     void didAssociateFormControlsTimerFired(Timer<Document>*);
     void styleResolverThrowawayTimerFired(Timer<Document>*);
 
     void processHttpEquivDefaultStyle(const String& content);
     void processHttpEquivRefresh(const String& content);
     void processHttpEquivSetCookie(const String& content);
     void processHttpEquivXFrameOptions(const String& content);
     void processHttpEquivContentSecurityPolicy(const String& equiv, const String& content);
 
+    DocumentLifecycle m_lifecyle;
+
     // FIXME: This should probably be handled inside the style resolver itself.
     Timer<Document> m_styleResolverThrowawayTimer;
     unsigned m_styleResolverAccessCount;
     unsigned m_lastStyleResolverAccessCount;
 
     OwnPtr<StyleResolver> m_styleResolver;
     bool m_didCalculateStyleResolver;
     bool m_hasNodesWithPlaceholderStyle;
     bool m_needsNotifyRemoveAllPendingStylesheet;
     // But sometimes you need to ignore pending stylesheet count to
@@ skipping 276 matching lines @@
 inline bool Node::isDocumentNode() const
 {
     return this == documentInternal();
 }
 
 Node* eventTargetNodeForDocument(Document*);
 
 } // namespace WebCore
 
 #endif // Document_h