Implement rotate*() 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 62 matching lines @@
         m_matrix.scaleNonUniform(sx, sy);
     else
         m_matrix.scale3d(sx, sy, sz);
 
     if (hasTranslation)
         translateSelf(-ox, -oy, -oz);
 
     return this;
 }
 
+DOMMatrix* DOMMatrix::rotateSelf(double angle, double ox, double oy)
+{
+    bool hasTranslation = (ox || oy);
+
+    if (hasTranslation)
+        translateSelf(ox, oy);
+
+    m_matrix.rotate(angle);
+
+    if (hasTranslation)
+        translateSelf(-ox, -oy);
+
+    return this;
+}
+
+DOMMatrix* DOMMatrix::rotateFromVectorSelf(double x, double y)
+{
+    m_matrix.rotateFromVector(x, y);
+
+    return this;
+}
+
+DOMMatrix* DOMMatrix::rotateAxisAngleSelf(
+    double x, double y, double z, double angle)
+{
+    if (x != 0 || y != 0)

[zino, 2014/08/17 15:32:50]

http://dev.w3.org/fxtf/geometry/#dom-dommatrix-rotateaxisangleself

The spec says that..
"If z is not 0, set is2D of the current matrix to false."

I'm not sure but it seems to be incorrect.
rotateAxisAngle(0, 0, 1, angle) is the same with rotate(angle).
So, I think the spec should be fixed.
"If x is not 0 or y is not 0, set is2D of the current matrix to false."

What do you think?

+        m_is2D = false;
+
+    m_matrix.rotate3d(x, y, z, angle);
+
+    return this;
+}
+
 } // namespace blink