Implement scale*() methods in DOMMatrix.

Source/core/dom/DOMMatrix.cpp

Index: Source/core/dom/DOMMatrix.cpp
diff --git a/Source/core/dom/DOMMatrix.cpp b/Source/core/dom/DOMMatrix.cpp
index 38e20ac40d0582b01f05ec5f3edcdcdaca1adf4d..75cefcb63fe9bf945653424bb609bba356e300b0 100644
--- a/Source/core/dom/DOMMatrix.cpp
+++ b/Source/core/dom/DOMMatrix.cpp
@@ -45,4 +45,39 @@ DOMMatrix* DOMMatrix::translateSelf(double tx, double ty, double 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