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

Source/core/html/HTMLMetaElement.h

Index: Source/core/html/HTMLMetaElement.h
diff --git a/Source/core/html/HTMLMetaElement.h b/Source/core/html/HTMLMetaElement.h
index f9255b11430cac2535f655c5e1e3b0e4b759ba33..52708d57615e8d6bb6af2dfc41b6c9121ec082e7 100644
--- a/Source/core/html/HTMLMetaElement.h
+++ b/Source/core/html/HTMLMetaElement.h
@@ -23,6 +23,7 @@
 #ifndef HTMLMetaElement_h
 #define HTMLMetaElement_h
 
+#include "core/css/StyleRule.h"
 #include "core/html/HTMLElement.h"
 
 namespace WebCore {
@@ -31,18 +32,52 @@ 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 void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     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;
+    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