Implement scale*() methods in DOMMatrix.

Source/core/dom/DOMMatrix.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 DOMMatrix_h
 #define DOMMatrix_h
 
 #include "core/dom/DOMMatrixReadOnly.h"
 
 namespace blink {
@@ skipping 20 matching lines @@
     void setM24(double value) { m_matrix[1][3] = value; setIs2D(!value); }
     void setM31(double value) { m_matrix[2][0] = value; setIs2D(!value); }
     void setM32(double value) { m_matrix[2][1] = value; setIs2D(!value); }
     void setM33(double value) { m_matrix[2][2] = value; setIs2D(value != 1); }
     void setM34(double value) { m_matrix[2][3] = value; setIs2D(!value); }
     void setM41(double value) { m_matrix[3][0] = value; }
     void setM42(double value) { m_matrix[3][1] = value; }
     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,
         double m31, double m32, double m33, double m34,
         double m41, double m42, double m43, double m44,
         bool is2D = true);
 
     void setIs2D(bool value);
 };
 
 } // namespace blink
 
 #endif