Implement toString() funtion in DOMMatrixReadOnly.

third_party/WebKit/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 "core/dom/DOMMatrix.h"
 
 namespace blink {
 
 DOMMatrixReadOnly* DOMMatrixReadOnly::create(Vector<double> sequence, ExceptionState& exceptionState)
 {
@@ skipping 100 matching lines @@
     double array[] = {
         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 DOMFloat64Array::create(array, 16);
 }
 
+const String DOMMatrixReadOnly::toString() const
+{
+    std::stringstream stream;
+    if (is2D()) {
+        stream << "matrix("
+        << a() << ", " << b() << ", " << c() << ", "
+        << d() << ", " << e() << ", " << f();
+    } else {
+        stream << "matrix3d("
+        << m11() << ", " << m12() << ", " << m13() << ", " << m14() << ", "
+        << m21() << ", " << m22() << ", " << m23() << ", " << m24() << ", "
+        << m31() << ", " << m32() << ", " << m33() << ", " << m34() << ", "
+        << m41() << ", " << m42() << ", " << m43() << ", " << m44();
+    }
+    stream << ")";
+
+    return String(stream.str().c_str());
+}
+
 } // namespace blink