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

Source/core/html/HTMLMetaElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2010 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef HTMLMetaElement_h
 #define HTMLMetaElement_h
 
+#include "core/css/StyleRule.h"
 #include "core/html/HTMLElement.h"
 
 namespace WebCore {
 
 class HTMLMetaElement FINAL : public HTMLElement {
 public:
     static PassRefPtr<HTMLMetaElement> create(Document*);
     static PassRefPtr<HTMLMetaElement> create(const QualifiedName&, Document*);
+    ~HTMLMetaElement();
 
     String content() const;
     String httpEquiv() const;
     String name() const;
 
+    CSSStyleSheet* sheet() const { return m_sheet.get(); }
+
 private:
     HTMLMetaElement(const QualifiedName&, Document*);
 
+    virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
+    virtual void removedFrom(ContainerNode*) OVERRIDE;
+
+    enum ErrorType {
+        NoError,
+        InvalidPropertySeparatorError,
+        InvalidPropertyError,
+        InvalidValueError,
+        OutOfBoundsValueError,
+        TruncatedValueError,
+    };
+
+    void reportError(ErrorType, const String& property, const String& value);
+
+    typedef void (*PropertyCollector)(HTMLMetaElement*, MutableStylePropertySet*, const String& property, const String& value);
+    static void viewportPropertyCollector(HTMLMetaElement*, MutableStylePropertySet*, const String& property, const String& value);
+
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
-    virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
+    void parseContentAttribute(MutableStylePropertySet*, const String&, PropertyCollector);
+
+    float parsePositiveNumber(const String& property, const String& value, float minValue, float maxValue);
+    CSSValueID parseViewportValueAsUserZoom(const String& property, const String& value);
+    PassRefPtr<CSSValue> parseViewportValueAsLength(const String& property, const String& value);
+    PassRefPtr<CSSValue> parseViewportValueAsZoom(const String& property, const String& value);
+    PassRefPtr<CSSValue> parseViewportValueAsDPI(const String& property, const String& value);
+
+    PassRefPtr<StyleRuleBase> parseViewportContent(const String&);
+    PassRefPtr<StyleRuleBase> parseHandheldFriendlyContent(const String&);
+    PassRefPtr<StyleRuleBase> parseMobileOptimizedContent(const String&);
 
     void process();
+    void addStyleSheetForRule(PassRefPtr<StyleRuleBase>);
+    void removeStyleSheet();
+
+    RefPtr<CSSStyleSheet> m_sheet;
 };
 
 } //namespace
 
 #endif