Implement translate() and translateSelf() in DOMMatrix.

Source/core/dom/DOMMatrix.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 {
 
 DOMMatrix* DOMMatrix::create()
@@ skipping 34 matching lines @@
     m_matrix[3][3] = m44;
     m_is2D = is2D;
 }
 
 void DOMMatrix::setIs2D(bool value)
 {
     if (m_is2D)
         m_is2D = value;
 }
 
+DOMMatrix* DOMMatrix::translateSelf(double tx, double ty, double tz)
+{
+    if (!tx && !ty && !tz)
+        return this;
+
+    if (tz)
+        m_is2D = false;
+
+    if (isIdentity()) {

[krit, 2014/08/08 06:24:15]

Why don't you use TransformationMatrix here?

[zino, 2014/08/16 03:23:32]

Done.

+        m_matrix[3][0] = tx;
+        m_matrix[3][1] = ty;
+        m_matrix[3][2] = tz;
+    } else {
+        m_matrix[3][0] += tx * m11() + ty * m21();
+        m_matrix[3][1] += tx * m12() + ty * m22();
+
+        if (!m_is2D) {
+            m_matrix[3][0] += tz * m31();
+            m_matrix[3][1] += tz * m32();
+            m_matrix[3][2] += tx * m13() + ty * m23() + tz * m33();
+            m_matrix[3][3] += tx * m14() + ty * m24() + tz * m34();
+        }
+    }
+
+    return this;
+}
+
 } // namespace blink