Provide a way to get a Type back from a ClassMirror.

runtime/lib/mirrors.cc

Index: runtime/lib/mirrors.cc
diff --git a/runtime/lib/mirrors.cc b/runtime/lib/mirrors.cc
index 7ab68b6a0c650a8e397e785e62f31e4daa7eccca..e0c8b2327c4e75efe5ff64fc4e49c3e10a4ee74f 100644
--- a/runtime/lib/mirrors.cc
+++ b/runtime/lib/mirrors.cc
@@ -305,9 +305,16 @@ DEFINE_NATIVE_ENTRY(Mirrors_makeLocalClassMirror, 1) {
   GET_NON_NULL_NATIVE_ARGUMENT(Type, type, arguments->NativeArgAt(0));
   const Class& cls = Class::Handle(type.type_class());
   ASSERT(!cls.IsNull());
-  return CreateClassMirror(cls,
-                           AbstractType::Handle(),
-                           Instance::null_instance());
+  // Strip the type for generics only.
+  if (cls.NumTypeParameters() == 0) {
+    return CreateClassMirror(cls,
+                             type,
+                             Object::null_instance());
+  } else {
+    return CreateClassMirror(cls,
+                             AbstractType::Handle(),
+                             Object::null_instance());
+  }
 }