Move temporary MathUtil wrappers to permanent home in gfx::Transform

ui/gfx/vector3d_f.h

Index: ui/gfx/vector3d_f.h
diff --git a/ui/gfx/vector3d_f.h b/ui/gfx/vector3d_f.h
index bb93abdeaffb8d1e325123e65df121c27b1ea31f..6ede95fb5e80e3be524af5f6f9446c7b67d232ba 100644
--- a/ui/gfx/vector3d_f.h
+++ b/ui/gfx/vector3d_f.h
@@ -24,6 +24,10 @@ class UI_EXPORT Vector3dF {
 
   explicit Vector3dF(const Vector2dF& other);
 
+  static Vector3dF XAxis() { return Vector3dF(1, 0, 0); }
+  static Vector3dF YAxis() { return Vector3dF(0, 1, 0); }
+  static Vector3dF ZAxis() { return Vector3dF(0, 0, 1); }
+
   float x() const { return x_; }
   void set_x(float x) { x_ = x; }