Implement translate() and translateSelf() 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 59b27ccf9fcece18644f4a4e4be5a3b4d25115a4..e1fe9ae0ba05ee0838cccfd49e1ce0319bafdd8b 100644
--- a/Source/core/dom/DOMMatrix.cpp
+++ b/Source/core/dom/DOMMatrix.cpp
@@ -52,4 +52,31 @@ void DOMMatrix::setIs2D(bool value)
         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