Transitively include outlines of all public members of Class(es).

pkg/front_end/testcases/shaker/transitive_class_lib.dart

 // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
 class A1 {}
 
 class A2 {}
 
 class A3 {}
 
@@ skipping 13 matching lines @@
   A1 publicField;
   A2 _privateField;
 }
 
 class C {
   A3 publicField;
   A4 _privateField;
   B b;
 
   C();
-  C.named();
+  C.namedConstructor();
 
   void publicMethod(A5 a) {}
   void _privateMethod(A6 a) {}
 }