Translate viewport related meta tags into @viewport descriptors as suggested by the CSS Device Adap…

Source/core/dom/StyleSheetCollection.cpp

 /*
  * 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 22 matching lines @@
 #include "core/css/StyleInvalidationAnalysis.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Document.h"
 #include "core/dom/DocumentStyleSheetCollection.h"
 #include "core/dom/Element.h"
 #include "core/dom/ProcessingInstruction.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "core/html/HTMLLinkElement.h"
+#include "core/html/HTMLMetaElement.h"
 #include "core/html/HTMLStyleElement.h"
 #include "core/page/Settings.h"
 #include "core/svg/SVGStyleElement.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 StyleSheetCollection::StyleSheetCollection(TreeScope* treeScope)
     : m_treeScope(treeScope)
@@ skipping 157 matching lines @@
             // Don't apply XSL transforms to already transformed documents -- <rdar://problem/4132806>
             if (pi->isXSL() && !document()->transformSourceDocument()) {
                 // Don't apply XSL transforms until loading is finished.
                 if (!document()->parsing() && !pi->isLoading())
                     document()->applyXSLTransform(pi);
                 return;
             }
             sheet = pi->sheet();
             if (sheet && !sheet->disabled() && sheet->isCSSStyleSheet())
                 activeSheet = static_cast<CSSStyleSheet*>(sheet);
-        } else if ((n->isHTMLElement() && (n->hasTagName(linkTag) || n->hasTagName(styleTag))) || (n->isSVGElement() && n->hasTagName(SVGNames::styleTag))) {
+        } else if ((n->isHTMLElement() && (n->hasTagName(linkTag) || n->hasTagName(styleTag) || n->hasTagName(metaTag))) || (n->isSVGElement() && n->hasTagName(SVGNames::styleTag))) {
             Element* e = toElement(n);
             AtomicString title = e->getAttribute(titleAttr);
             bool enabledViaScript = false;
             if (e->hasLocalName(linkTag)) {
                 // <LINK> element
                 HTMLLinkElement* linkElement = toHTMLLinkElement(n);
                 enabledViaScript = linkElement->isEnabledViaScript();
                 if (!linkElement->isDisabled() && linkElement->styleSheetIsLoading()) {
                     // it is loading but we should still decide which style sheet set to use
                     if (!enabledViaScript && !title.isEmpty() && collections->preferredStylesheetSetName().isEmpty()) {
                         const AtomicString& rel = e->getAttribute(relAttr);
                         if (!rel.contains("alternate")) {
                             collections->setPreferredStylesheetSetName(title);
                             collections->setSelectedStylesheetSetName(title);
                         }
                     }
 
                     continue;
                 }
                 sheet = linkElement->sheet();
                 if (!sheet)
                     title = nullAtom;
             } else if (n->isSVGElement() && n->hasTagName(SVGNames::styleTag)) {
                 sheet = static_cast<SVGStyleElement*>(n)->sheet();
+            } else if (n->hasTagName(styleTag)) {
+                sheet = static_cast<HTMLStyleElement*>(n)->sheet();
             } else {
-                sheet = static_cast<HTMLStyleElement*>(n)->sheet();
+                sheet = static_cast<HTMLMetaElement*>(n)->sheet();
             }
 
             if (sheet && !sheet->disabled() && sheet->isCSSStyleSheet())
                 activeSheet = static_cast<CSSStyleSheet*>(sheet);
 
             // Check to see if this sheet belongs to a styleset
             // (thus making it PREFERRED or ALTERNATE rather than
             // PERSISTENT).
             AtomicString rel = e->getAttribute(relAttr);
             if (!enabledViaScript && sheet && !title.isEmpty()) {
@@ skipping 61 matching lines @@
     }
     m_scopingNodesForStyleScoped.didRemoveScopingNodes();
     m_activeAuthorStyleSheets.swap(activeCSSStyleSheets);
     m_styleSheetsForStyleSheetList.swap(styleSheets);
     updateUsesRemUnits();
 
     return requiresFullStyleRecalc;
 }
 
 }