Implement scale*() methods in DOMMatrix.

Source/core/dom/DOMMatrixReadOnly.h

Index: Source/core/dom/DOMMatrixReadOnly.h
diff --git a/Source/core/dom/DOMMatrixReadOnly.h b/Source/core/dom/DOMMatrixReadOnly.h
index 92b60f4d92e36b94015b94a4a619f110988910e3..e0460f384fefbeb39f016c3c7c7e6d5bffde74a4 100644
--- a/Source/core/dom/DOMMatrixReadOnly.h
+++ b/Source/core/dom/DOMMatrixReadOnly.h
@@ -43,6 +43,10 @@ public:
     bool isIdentity() const;
 
     DOMMatrix* translate(double tx, double ty, double tz = 0);
+    DOMMatrix* scale(double scale, double ox = 0, double oy = 0);
+    DOMMatrix* scale3d(double scale, double ox = 0, double oy = 0, double oz = 0);
+    DOMMatrix* scaleNonUniform(double sx, double sy = 1, double sz = 1,
+        double ox = 0, double oy = 0, double oz = 0);
 
     const TransformationMatrix& matrix() const { return m_matrix; }