CSS Length calculation with MediaValues

Source/core/css/CSSToLengthConversionData.h

Index: Source/core/css/CSSToLengthConversionData.h
diff --git a/Source/core/css/CSSToLengthConversionData.h b/Source/core/css/CSSToLengthConversionData.h
index 6b81ce993b90d3a58beb9a423fd9005b184c4e37..204304693bd11c6c70450d21f3c0e7db0964e673 100644
--- a/Source/core/css/CSSToLengthConversionData.h
+++ b/Source/core/css/CSSToLengthConversionData.h
@@ -31,6 +31,7 @@
 #ifndef CSSToLengthConversionData_h
 #define CSSToLengthConversionData_h
 
+#include "core/css/CSSLengthData.h"
 #include "wtf/Assertions.h"
 #include "wtf/Noncopyable.h"
 
@@ -39,7 +40,7 @@ namespace WebCore {
 class RenderStyle;
 class RenderView;
 
-class CSSToLengthConversionData {
+class CSSToLengthConversionData: public CSSLengthData {
 public:
     CSSToLengthConversionData(const RenderStyle* currStyle, const RenderStyle* rootStyle, const RenderView*, float zoom, bool computingFontSize = false);
     CSSToLengthConversionData(const RenderStyle* currStyle, const RenderStyle* rootStyle, const RenderView*, bool computingFontSize = false);
@@ -47,14 +48,22 @@ public:
 
     const RenderStyle& style() const { return *m_style; }
     const RenderStyle* rootStyle() const { return m_rootStyle; }
-    float zoom() const;
-    bool computingFontSize() const { return m_computingFontSize; }
+    virtual float zoom() const;
+    virtual bool computingFontSize() const;
+    virtual double fontSpecifiedSize() const;
+    virtual double fontComputedSize() const;
+    virtual double rootFontSpecifiedSize() const;
+    virtual double rootFontComputedSize() const;
+    virtual bool hasXHeight() const;
+    virtual double xHeight() const;
+    virtual double zeroWidth() const;
+    virtual bool hasRoot() const { return !!m_rootStyle; }
 
     // Accessing these marks the style as having viewport units
-    double viewportWidthPercent() const;
-    double viewportHeightPercent() const;
-    double viewportMinPercent() const;
-    double viewportMaxPercent() const;
+    virtual double viewportWidthPercent() const;
+    virtual double viewportHeightPercent() const;
+    virtual double viewportMinPercent() const;
+    virtual double viewportMaxPercent() const;
 
     void setStyle(const RenderStyle* style) { m_style = style; }
     void setRootStyle(const RenderStyle* rootStyle) { m_rootStyle = rootStyle; }