Use css-device-adapt constraining for legacy viewport tags.

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 271 matching lines @@
     DEFINE_ATTRIBUTE_EVENT_LISTENER(touchmove);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(touchend);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(touchcancel);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(webkitfullscreenchange);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(webkitfullscreenerror);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(webkitpointerlockchange);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(webkitpointerlockerror);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(webkitvisibilitychange);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(securitypolicyviolation);
 
-    void setViewportArguments(const ViewportArguments& viewportArguments) { m_viewportArguments = viewportArguments; }
+    void setViewportArguments(const ViewportArguments&);
     const ViewportArguments& viewportArguments() const { return m_viewportArguments; }
 #ifndef NDEBUG
     bool didDispatchViewportPropertiesChanged() const { return m_didDispatchViewportPropertiesChanged; }
 #endif
+    bool hasLegacyViewportTag() const { return m_legacyViewportArguments.isLegacyViewportType(); }
 
     void setReferrerPolicy(ReferrerPolicy referrerPolicy) { m_referrerPolicy = referrerPolicy; }
     ReferrerPolicy referrerPolicy() const { return m_referrerPolicy; }
 
     void setDoctype(PassRefPtr<DocumentType>);
     DocumentType* doctype() const { return m_docType.get(); }
 
     DOMImplementation* implementation();
 
     Element* documentElement() const
@@ skipping 103 matching lines @@
     bool isImageDocument() const { return m_documentClasses & ImageDocumentClass; }
     bool isSVGDocument() const { return m_documentClasses & SVGDocumentClass; }
     bool isPluginDocument() const { return m_documentClasses & PluginDocumentClass; }
     bool isMediaDocument() const { return m_documentClasses & MediaDocumentClass; }
 
     bool hasSVGRootNode() const;
 
     bool isFrameSet() const;
 
     bool isSrcdocDocument() const { return m_isSrcdocDocument; }
+    bool isMobileDocument() const { return m_isMobileDocument; }
 
     StyleResolver* styleResolverIfExists() const { return m_styleResolver.get(); }
 
     bool isViewSource() const { return m_isViewSource; }
     void setIsViewSource(bool);
 
     bool sawElementsInKnownNamespaces() const { return m_sawElementsInKnownNamespaces; }
 
     StyleResolver* styleResolver()
     {
@@ skipping 873 matching lines @@
 
     OwnPtr<SelectorQueryCache> m_selectorQueryCache;
 
     bool m_useSecureKeyboardEntryWhenActive;
 
     DocumentClassFlags m_documentClasses;
 
     bool m_isViewSource;
     bool m_sawElementsInKnownNamespaces;
     bool m_isSrcdocDocument;
+    bool m_isMobileDocument;
 
     RenderObject* m_renderer;
     RefPtr<DocumentEventQueue> m_eventQueue;
 
     WeakPtrFactory<Document> m_weakFactory;
 
     QualifiedName m_idAttributeName;
 
     bool m_hasFullscreenElementStack; // For early return in FullscreenElementStack::fromIfExists()
 
     Vector<RefPtr<Element> > m_topLayerElements;
 
     int m_loadEventDelayCount;
     Timer<Document> m_loadEventDelayTimer;
 
     ViewportArguments m_viewportArguments;
+    ViewportArguments m_legacyViewportArguments;
 
     ReferrerPolicy m_referrerPolicy;
 
     bool m_directionSetOnDocumentElement;
     bool m_writingModeSetOnDocumentElement;
 
     bool m_didAllowNavigationViaBeforeUnloadConfirmationPanel;
 
     DocumentTiming m_documentTiming;
     RefPtr<MediaQueryMatcher> m_mediaQueryMatcher;
@@ skipping 53 matching lines @@
 
 inline const Document* Document::templateDocument() const
 {
     // If DOCUMENT does not have a browsing context, Let TEMPLATE CONTENTS OWNER be DOCUMENT and abort these steps.
     if (!m_frame)
         return this;
 
     return m_templateDocument.get();
 }
 
+inline void Document::setViewportArguments(const ViewportArguments& viewportArguments)
+{
+    // If the legacy viewport tag has higher priority than the cascaded @viewport
+    // descriptors, use the values from the legacy tag.
+    if (viewportArguments.type < m_legacyViewportArguments.type)
+        m_viewportArguments = m_legacyViewportArguments;
+    else
+        m_viewportArguments = viewportArguments;
+    updateViewportArguments();
+}
+
 inline Document* toDocument(ScriptExecutionContext* scriptExecutionContext)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!scriptExecutionContext || scriptExecutionContext->isDocument());
     return static_cast<Document*>(scriptExecutionContext);
 }
 
 inline const Document* toDocument(const ScriptExecutionContext* scriptExecutionContext)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!scriptExecutionContext || scriptExecutionContext->isDocument());
     return static_cast<const Document*>(scriptExecutionContext);
@@ skipping 19 matching lines @@
 inline bool Node::isDocumentNode() const
 {
     return this == documentInternal();
 }
 
 Node* eventTargetNodeForDocument(Document*);
 
 } // namespace WebCore
 
 #endif // Document_h