Avoid clobbering state in viewport tag initialization.

third_party/WebKit/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 246 matching lines @@
     DEFINE_ATTRIBUTE_EVENT_LISTENER(paste);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(pointerlockchange);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(pointerlockerror);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(readystatechange);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(search);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(securitypolicyviolation);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(selectionchange);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(selectstart);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(wheel);
 
-    bool shouldMergeWithLegacyDescription(ViewportDescription::Type);
-    bool shouldOverrideLegacyDescription(ViewportDescription::Type);
+    bool shouldMergeWithLegacyDescription(ViewportDescription::Type) const;
+    bool shouldOverrideLegacyDescription(ViewportDescription::Type) const;
     void setViewportDescription(const ViewportDescription&);
-    const ViewportDescription& viewportDescription() const { return m_viewportDescription; }
+    ViewportDescription viewportDescription() const;
     Length viewportDefaultMinWidth() const { return m_viewportDefaultMinWidth; }
 
     String outgoingReferrer() const override;
 
     void setDoctype(DocumentType*);
     DocumentType* doctype() const { return m_docType.get(); }
 
     DOMImplementation& implementation();
 
     Element* documentElement() const
@@ skipping 1126 matching lines @@
     Member<IntersectionObserverController> m_intersectionObserverController;
     Member<NodeIntersectionObserverData> m_intersectionObserverData;
 
     int m_nodeCount;
 
     bool m_mayContainV0Shadow = false;
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT Supplement<Document>;
 
-inline bool Document::shouldOverrideLegacyDescription(ViewportDescription::Type origin)
+inline bool Document::shouldOverrideLegacyDescription(ViewportDescription::Type origin) const
 {
     // The different (legacy) meta tags have different priorities based on the type
     // regardless of which order they appear in the DOM. The priority is given by the
     // ViewportDescription::Type enum.
     return origin >= m_legacyViewportDescription.type;
 }
 
 inline void Document::scheduleLayoutTreeUpdateIfNeeded()
 {
     // Inline early out to avoid the function calls below.
@@ skipping 24 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif // Document_h