Implement *multiply*() methods in DOMMatrix.

Source/core/dom/DOMMatrixReadOnly.cpp

 // 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.
 
 #include "config.h"
 #include "core/dom/DOMMatrix.h"
 
 namespace blink {
 
 bool DOMMatrixReadOnly::is2D() const
 {
     return m_is2D;
 }
 
 bool DOMMatrixReadOnly::isIdentity() const
 {
     return m_matrix.isIdentity();
 }
 
+DOMMatrix* DOMMatrixReadOnly::multiply(DOMMatrix* other)
+{
+    return DOMMatrix::create(this)->multiplySelf(other);
+}
+
 DOMMatrix* DOMMatrixReadOnly::translate(double tx, double ty, double tz)
 {
     return DOMMatrix::create(this)->translateSelf(tx, ty, tz);
 }
 
 DOMMatrix* DOMMatrixReadOnly::scale(double scale, double ox, double oy)
 {
     return DOMMatrix::create(this)->scaleSelf(scale, ox, oy);
 }
 
@@ skipping 26 matching lines @@
         m_matrix.m11(), m_matrix.m12(), m_matrix.m13(), m_matrix.m14(),
         m_matrix.m21(), m_matrix.m22(), m_matrix.m23(), m_matrix.m24(),
         m_matrix.m31(), m_matrix.m32(), m_matrix.m33(), m_matrix.m34(),
         m_matrix.m41(), m_matrix.m42(), m_matrix.m43(), m_matrix.m44()
     };
 
     return Float64Array::create(array, 16);
 }
 
 } // namespace blink