As a follow-up to stripping annotations from type mirrors returned by methods in Types (JDK-8042981), it would be helpful to provide methods to add annotations. Sketch of a proposal:

<T extends TypeMirror> T withAnnotations(T typeMirror, List<? extends
AnnotationMirror> annotations)

<T extends TypeMirror> T withAnnotations(T typeMirror,
AnnotatedConstruct annotationHost)

http://mail.openjdk.java.net/pipermail/compiler-dev/2014-May/008782.html