Store actual Reference(s) for additional exports.

pkg/kernel/lib/text/ast_to_text.dart

Index: pkg/kernel/lib/text/ast_to_text.dart
diff --git a/pkg/kernel/lib/text/ast_to_text.dart b/pkg/kernel/lib/text/ast_to_text.dart
index 12d012a1e07dd49b5862c54c99ac148c4f049dbd..1c5b71b4a885157c058dee83823e5ec3c403f5fd 100644
--- a/pkg/kernel/lib/text/ast_to_text.dart
+++ b/pkg/kernel/lib/text/ast_to_text.dart
@@ -283,7 +283,35 @@ class Printer extends Visitor<Null> {
         endLine('import "$importPath" as $prefix;');
       }
     }
+
     // TODO(scheglov): Do we want to print dependencies? dartbug.com/30224
+    if (library.additionalExports.isNotEmpty) {
+      write('additionalExports = (');
+      for (var reference in library.additionalExports) {
+        var node = reference.node;
+        if (node is Class) {
+          Library nodeLibrary = node.enclosingLibrary;
+          String prefix = syntheticNames.nameLibraryPrefix(nodeLibrary);
+          write(prefix + '::' + node.name);
+        } else if (node is Field) {
+          Library nodeLibrary = node.enclosingLibrary;
+          String prefix = syntheticNames.nameLibraryPrefix(nodeLibrary);
+          write(prefix + '::' + node.name.name);
+        } else if (node is Procedure) {
+          Library nodeLibrary = node.enclosingLibrary;
+          String prefix = syntheticNames.nameLibraryPrefix(nodeLibrary);
+          write(prefix + '::' + node.name.name);
+        } else if (node is Typedef) {
+          Library nodeLibrary = node.enclosingLibrary;
+          String prefix = syntheticNames.nameLibraryPrefix(nodeLibrary);
+          write(prefix + '::' + node.name);
+        } else {
+          throw new UnimplementedError('${node.runtimeType}');
+        }
+      }
+      endLine(')');
+    }
+
     endLine();
     var inner = new Printer._inner(this, imports);
     library.typedefs.forEach(inner.writeNode);