Implement rotate*() methods in DOMMatrix.

Source/core/dom/DOMMatrixReadOnly.idl

 // 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.
 
 [
     GarbageCollected,
     RuntimeEnabled=GeometryInterfaces,
 ] interface DOMMatrixReadOnly {
     // These attributes are simple aliases for certain elements of the 4x4 matrix
     readonly attribute unrestricted double a;
@@ skipping 35 matching lines @@
     DOMMatrix scale3d(unrestricted double scale,
                       optional unrestricted double ox = 0,
                       optional unrestricted double oy = 0,
                       optional unrestricted double oz = 0);
     DOMMatrix scaleNonUniform(unrestricted double sx,
                               optional unrestricted double sy = 1,
                               optional unrestricted double sz = 1,
                               optional unrestricted double ox = 0,
                               optional unrestricted double oy = 0,
                               optional unrestricted double oz = 0);
+    DOMMatrix rotate(unrestricted double angle,
+                     optional unrestricted double ox = 0,
+                     optional unrestricted double oy = 0);
+    DOMMatrix rotateFromVector(unrestricted double x,
+                               unrestricted double y);
+    DOMMatrix rotateAxisAngle(unrestricted double x,
+                              unrestricted double y,
+                              unrestricted double z,
+                              unrestricted double angle);
+
     Float32Array toFloat32Array();
     Float64Array toFloat64Array();
 };