DOMMatrix should use TransformationMatrix internally.

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 {
 
 class DOMMatrix : public DOMMatrixReadOnly {
 public:
     static DOMMatrix* create();
     static DOMMatrix* create(DOMMatrixReadOnly*);
 
-    void setA(double value) { setM11(value); }
-    void setB(double value) { setM12(value); }
-    void setC(double value) { setM21(value); }
-    void setD(double value) { setM22(value); }
-    void setE(double value) { setM41(value); }
-    void setF(double value) { setM42(value); }
+    void setA(double value) { m_matrix.setM11(value); }
+    void setB(double value) { m_matrix.setM12(value); }
+    void setC(double value) { m_matrix.setM21(value); }
+    void setD(double value) { m_matrix.setM22(value); }
+    void setE(double value) { m_matrix.setM41(value); }
+    void setF(double value) { m_matrix.setM42(value); }
 
-    void setM11(double value) { m_matrix[0][0] = value; }
-    void setM12(double value) { m_matrix[0][1] = value; }
-    void setM13(double value) { m_matrix[0][2] = value; setIs2D(!value); }
-    void setM14(double value) { m_matrix[0][3] = value; setIs2D(!value); }
-    void setM21(double value) { m_matrix[1][0] = value; }
-    void setM22(double value) { m_matrix[1][1] = value; }
-    void setM23(double value) { m_matrix[1][2] = value; setIs2D(!value); }
-    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); }
+    void setM11(double value) { m_matrix.setM11(value); }
+    void setM12(double value) { m_matrix.setM12(value); }
+    void setM13(double value) { m_matrix.setM13(value); setIs2D(!value); }
+    void setM14(double value) { m_matrix.setM14(value); setIs2D(!value); }
+    void setM21(double value) { m_matrix.setM21(value); }
+    void setM22(double value) { m_matrix.setM22(value); }
+    void setM23(double value) { m_matrix.setM23(value); setIs2D(!value); }
+    void setM24(double value) { m_matrix.setM24(value); setIs2D(!value); }
+    void setM31(double value) { m_matrix.setM31(value); setIs2D(!value); }
+    void setM32(double value) { m_matrix.setM32(value); setIs2D(!value); }
+    void setM33(double value) { m_matrix.setM33(value); setIs2D(value != 1); }
+    void setM34(double value) { m_matrix.setM34(value); setIs2D(!value); }
+    void setM41(double value) { m_matrix.setM41(value); }
+    void setM42(double value) { m_matrix.setM42(value); }
+    void setM43(double value) { m_matrix.setM43(value); setIs2D(!value); }
+    void setM44(double value) { m_matrix.setM44(value); setIs2D(value != 1); }
 
 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);
+    DOMMatrix(const TransformationMatrix&, bool is2D = true);
 
     void setIs2D(bool value);
 };
 
 } // namespace blink
 
 #endif