CSS Length calculation with MediaValues

Source/core/css/CSSLengthData.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CSSLengthData_h
+#define CSSLengthData_h
+
+namespace WebCore {
+class CSSLengthData {
+public:
+    virtual ~CSSLengthData() { }
+    virtual float zoom() const = 0;
+    virtual bool computingFontSize() const = 0;
+    virtual double fontSpecifiedSize() const = 0;
+    virtual double fontComputedSize() const = 0;
+    virtual double rootFontSpecifiedSize() const = 0;
+    virtual double rootFontComputedSize() const = 0;
+    virtual bool hasXHeight() const = 0;
+    virtual double xHeight() const = 0;
+    virtual double zeroWidth() const = 0;
+    virtual bool hasRoot() const = 0;
+
+    virtual double viewportWidthPercent() const = 0;
+    virtual double viewportHeightPercent() const = 0;
+    virtual double viewportMinPercent() const = 0;
+    virtual double viewportMaxPercent() const = 0;
+};
+
+} // namespace
+
+#endif // CSSLengthData_h
+