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

Source/core/page/Page.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef Page_h
 #define Page_h
 
 #include "core/dom/ViewportDescription.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/SettingsDelegate.h"
 #include "core/frame/UseCounter.h"
 #include "core/page/PageAnimator.h"
-#include "core/page/PageLifecycleNotifier.h"
 #include "core/page/PageVisibilityState.h"
+#include "platform/LifecycleContext.h"
 #include "platform/Supplementable.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/geometry/Region.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 #include "wtf/HashSet.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class AutoscrollController;
 class Chrome;
 class ChromeClient;
 class ClientRectList;
 class ContextMenuClient;
 class ContextMenuController;
 class Document;
 class DragCaretController;
 class DragClient;
 class DragController;
 class EditorClient;
 class FocusController;
 class Frame;
 class FrameHost;
 class InspectorClient;
 class InspectorController;
+class PageLifecycleNotifier;
 class PluginData;
 class PointerLockController;
 class ScrollingCoordinator;
 class Settings;
 class SpellCheckerClient;
 class UndoStack;
 class ValidationMessageClient;
 
 typedef uint64_t LinkHash;
 
 float deviceScaleFactor(LocalFrame*);
 
-class Page final : public NoBaseWillBeGarbageCollectedFinalized<Page>, public WillBeHeapSupplementable<Page>, public PageLifecycleNotifier, public SettingsDelegate {
+class Page final : public NoBaseWillBeGarbageCollectedFinalized<Page>, public WillBeHeapSupplementable<Page>, public LifecycleContext<Page>, public SettingsDelegate {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(Page);
     WTF_MAKE_NONCOPYABLE(Page);
     friend class Settings;
 public:
     static void platformColorsChanged();
 
     // It is up to the platform to ensure that non-null clients are provided where required.
     struct PageClients {
         WTF_MAKE_NONCOPYABLE(PageClients); WTF_MAKE_FAST_ALLOCATED;
     public:
@@ skipping 109 matching lines @@
     };
 
     void addMultisamplingChangedObserver(MultisamplingChangedObserver*);
     void removeMultisamplingChangedObserver(MultisamplingChangedObserver*);
 
     void didCommitLoad(LocalFrame*);
 
     void acceptLanguagesChanged();
 
     static void networkStateChanged(bool online);
+    PassOwnPtr<LifecycleNotifier<Page>> createLifecycleNotifier();
 
     void trace(Visitor*);
     void willBeDestroyed();
 
+protected:
+    PageLifecycleNotifier& lifecycleNotifier();
+
 private:
     void initGroup();
 
     void setTimerAlignmentInterval(double);
 
     void setNeedsLayoutInAllFrames();
 
     // SettingsDelegate overrides.
     virtual void settingsChanged(SettingsDelegate::ChangeType) override;
 
@@ skipping 51 matching lines @@
     WillBeHeapHashSet<RawPtrWillBeWeakMember<MultisamplingChangedObserver>> m_multisamplingChangedObservers;
 
     // A pointer to all the interfaces provided to in-process Frames for this Page.
     // FIXME: Most of the members of Page should move onto FrameHost.
     OwnPtrWillBeMember<FrameHost> m_frameHost;
 };
 
 } // namespace blink
 
 #endif // Page_h