Oilpan: have DocumentInit use transition types throughout.

Source/core/dom/DocumentInit.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) 2013 Google Inc. All rights reserved.
  *
@@ skipping 29 matching lines @@
 
 class CustomElementRegistrationContext;
 class Document;
 class LocalFrame;
 class HTMLImportsController;
 class Settings;
 
 class DocumentInit FINAL {
     STACK_ALLOCATED();
 public:
-    explicit DocumentInit(const KURL& = KURL(), LocalFrame* = 0, WeakPtr<Document> = WeakPtr<Document>(), HTMLImportsController* = 0);
+    explicit DocumentInit(const KURL& = KURL(), LocalFrame* = 0, WeakPtrWillBeRawPtr<Document> = nullptr, HTMLImportsController* = 0);

[tkent, 2014/06/02 07:56:07]

WeakPtr(std::nullptr_t) is necessary because RawPtr needs nullptr initialization
here, right?

[sof, 2014/06/02 08:01:34]

Yes, exactly so. As RawPtr() (for the Oilpan case) represent an uninitialized
pointer, and we do want it that way, reconciled this invocation of a transition
type constructor by extending WeakPtr's range of constructors.

     DocumentInit(const DocumentInit&);
     ~DocumentInit();
 
     const KURL& url() const { return m_url; }
     LocalFrame* frame() const { return m_frame; }
     HTMLImportsController* importsController() const { return m_importsController; }
 
     bool hasSecurityContext() const { return frameForSecurityContext(); }
     bool shouldTreatURLAsSrcdocDocument() const;
     bool shouldSetURL() const;
     bool isSeamlessAllowedFor(Document* child) const;
     SandboxFlags sandboxFlags() const;
 
     Document* parent() const { return m_parent.get(); }
     Document* owner() const { return m_owner.get(); }
     KURL parentBaseURL() const;
     LocalFrame* ownerFrame() const;
     Settings* settings() const;
 
     DocumentInit& withRegistrationContext(CustomElementRegistrationContext*);
     DocumentInit& withNewRegistrationContext();
     PassRefPtrWillBeRawPtr<CustomElementRegistrationContext> registrationContext(Document*) const;
-    WeakPtr<Document> contextDocument() const;
+    WeakPtrWillBeRawPtr<Document> contextDocument() const;
 
-    static DocumentInit fromContext(WeakPtr<Document> contextDocument, const KURL& = KURL());
+    static DocumentInit fromContext(WeakPtrWillBeRawPtr<Document> contextDocument, const KURL& = KURL());
 
 private:
     LocalFrame* frameForSecurityContext() const;
 
     KURL m_url;
     LocalFrame* m_frame;
-    RefPtr<Document> m_parent;
-    RefPtr<Document> m_owner;
-    WeakPtr<Document> m_contextDocument;
+    RefPtrWillBeMember<Document> m_parent;
+    RefPtrWillBeMember<Document> m_owner;
+    WeakPtrWillBeMember<Document> m_contextDocument;
     RawPtrWillBeMember<HTMLImportsController> m_importsController;
     RefPtrWillBeMember<CustomElementRegistrationContext> m_registrationContext;
     bool m_createNewRegistrationContext;
 };
 
 } // namespace WebCore
 
 #endif // DocumentInit_h