Implement scale*() methods 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 27 matching lines @@
         m_is2D = false;
 
     if (m_is2D)
         m_matrix.translate(tx, ty);
     else
         m_matrix.translate3d(tx, ty, tz);
 
     return this;
 }
 
+DOMMatrix* DOMMatrix::scaleSelf(double scale, double ox, double oy)
+{
+    return scaleNonUniformSelf(scale, scale, 1, ox, oy);
+}
+
+DOMMatrix* DOMMatrix::scale3dSelf(double scale, double ox, double oy, double oz)
+{
+    return scaleNonUniformSelf(scale, scale, scale, ox, oy, oz);
+}
+
+DOMMatrix* DOMMatrix::scaleNonUniformSelf(double sx, double sy, double sz,
+    double ox, double oy, double oz)
+{
+    if (sz != 1 || oz)
+        m_is2D = false;
+
+    if (sx == 1 && sy == 1 && sz == 1)
+        return this;
+
+    bool hasTranslation = (ox || oy || oz);
+
+    if (hasTranslation)
+        translateSelf(ox, oy, oz);
+
+    if (m_is2D)
+        m_matrix.scaleNonUniform(sx, sy);
+    else
+        m_matrix.scale3d(sx, sy, sz);
+
+    if (hasTranslation)
+        translateSelf(-ox, -oy, -oz);
+
+    return this;
+}
+
 } // namespace blink