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

Source/core/css/CSSStyleSheet.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2012 Apple Inc. All rights reserved.
  *
  * 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,
@@ skipping 46 matching lines @@
 
 #if !ASSERT_DISABLED
 static bool isAcceptableCSSStyleSheetParent(Node* parentNode)
 {
     // Only these nodes can be parents of StyleSheets, and they need to call clearOwnerNode() when moved out of document.
     return !parentNode
         || parentNode->isDocumentNode()
         || parentNode->hasTagName(HTMLNames::linkTag)
         || parentNode->hasTagName(HTMLNames::styleTag)
         || parentNode->hasTagName(SVGNames::styleTag)
+        || parentNode->hasTagName(HTMLNames::metaTag)
         || parentNode->nodeType() == Node::PROCESSING_INSTRUCTION_NODE;
 }
 #endif
 
 PassRefPtr<CSSStyleSheet> CSSStyleSheet::create(PassRefPtr<StyleSheetContents> sheet, CSSImportRule* ownerRule)
 {
     return adoptRef(new CSSStyleSheet(sheet, ownerRule));
 }
 
 PassRefPtr<CSSStyleSheet> CSSStyleSheet::create(PassRefPtr<StyleSheetContents> sheet, Node* ownerNode)
@@ skipping 282 matching lines @@
         root = root->parentStyleSheet();
     return root->ownerNode() ? root->ownerNode()->document() : 0;
 }
 
 void CSSStyleSheet::clearChildRuleCSSOMWrappers()
 {
     m_childRuleCSSOMWrappers.clear();
 }
 
 }