Issue 3968. Support for redirecting factory constructors

compiler/java/com/google/dart/compiler/ast/DartToSourceVisitor.java

 // Copyright (c) 2012, 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 file.
 
 package com.google.dart.compiler.ast;
 
 import com.google.dart.compiler.util.TextOutput;
 
 import java.util.Iterator;
 import java.util.List;
@@ skipping 278 matching lines @@
       for (int i = 0; i < inits.size(); ++i) {
         accept(inits.get(i));
         if (i < inits.size() - 1) {
           p(", ");
         }
       }
     }
     // body
     if (x.getFunction().getBody() != null) {
       accept(x.getFunction().getBody());
+    } else if (x.getRedirectedTypeName() != null) {
+      p(" = ");
+      accept(x.getRedirectedTypeName());
+      if (x.getRedirectedConstructorName() != null) {
+        p(".");
+        accept(x.getRedirectedConstructorName());
+      }
+      p(";");
+      nl();
     } else {
       p(";");
       nl();
     }
     // done
     return null;
   }
 
   @Override
   public Void visitInitializer(DartInitializer x) {
@@ skipping 685 matching lines @@
   }
 
   private void indent() {
     out.indentIn();
   }
 
   private void outdent() {
     out.indentOut();
   }
 }