Implement rotate*() methods in DOMMatrix.

Source/core/dom/DOMMatrixReadOnly.h

Index: Source/core/dom/DOMMatrixReadOnly.h
diff --git a/Source/core/dom/DOMMatrixReadOnly.h b/Source/core/dom/DOMMatrixReadOnly.h
index 5933420f1c6e262678afd65f94691efb44fa6981..bca7fc080579b41311d1a6f00fb3fcf46ad2dfef 100644
--- a/Source/core/dom/DOMMatrixReadOnly.h
+++ b/Source/core/dom/DOMMatrixReadOnly.h
@@ -50,6 +50,9 @@ public:
     DOMMatrix* scale3d(double scale, double ox = 0, double oy = 0, double oz = 0);
     DOMMatrix* scaleNonUniform(double sx, double sy = 1, double sz = 1,
         double ox = 0, double oy = 0, double oz = 0);
+    DOMMatrix* rotate(double angle, double ox = 0, double oy = 0);
+    DOMMatrix* rotateFromVector(double x, double y);
+    DOMMatrix* rotateAxisAngle(double x, double y, double z, double angle);
 
     PassRefPtr<Float32Array> toFloat32Array() const;
     PassRefPtr<Float64Array> toFloat64Array() const;