Implement basic interfaces and attributes for DOMMatrix.

Source/core/dom/DOMMatrixReadOnly.cpp

Index: Source/core/dom/DOMMatrixReadOnly.cpp
diff --git a/Source/core/dom/DOMMatrixReadOnly.cpp b/Source/core/dom/DOMMatrixReadOnly.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..887e75fa11d33f6e28a95ce6cd9b86bc1ddceb4e
--- /dev/null
+++ b/Source/core/dom/DOMMatrixReadOnly.cpp
@@ -0,0 +1,23 @@
+// 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/DOMMatrixReadOnly.h"
+
+namespace blink {
+
+bool DOMMatrixReadOnly::is2D() const
+{
+    return m_is2D;
+}
+
+bool DOMMatrixReadOnly::isIdentity() const
+{
+    return m11() == 1 && m21() == 0 && m31() == 0 && m41() == 0
+        && m12() == 0 && m22() == 1 && m32() == 0 && m42() == 0
+        && m13() == 0 && m23() == 0 && m33() == 1 && m43() == 0
+        && m14() == 0 && m24() == 0 && m34() == 0 && m44() == 1;
+}
+
+} // namespace blink