Implement scale*() methods in DOMMatrix.

Source/core/dom/DOMMatrix.h

Index: Source/core/dom/DOMMatrix.h
diff --git a/Source/core/dom/DOMMatrix.h b/Source/core/dom/DOMMatrix.h
index 2413bec0c51c236204628b06780d3ab345809f61..87d04360e28218cf4334525468ad1bdbb0ad9de5 100644
--- a/Source/core/dom/DOMMatrix.h
+++ b/Source/core/dom/DOMMatrix.h
@@ -38,6 +38,11 @@ public:
     void setM43(double value) { m_matrix[3][2] = value; setIs2D(!value); }
     void setM44(double value) { m_matrix[3][3] = value; setIs2D(value != 1); }
 
+    DOMMatrix* scaleSelf(double scale, double ox = 0, double oy = 0);
+    DOMMatrix* scale3dSelf(double scale, double ox = 0, double oy = 0, double oz = 0);
+    DOMMatrix* scaleNonUniformSelf(double sx, double sy = 1, double sz = 1,
+        double ox = 0, double oy = 0, double oz = 0);
+
 private:
     DOMMatrix(double m11, double m12, double m13, double m14,
         double m21, double m22, double m23, double m24,