Fix summary resynthesis in the event of a self-import.

pkg/analyzer/test/src/summary/prelinker_test.dart

 // Copyright (c) 2016, 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.
 
 library analyzer.test.src.summary.prelinker_test;
 
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:analyzer/src/summary/idl.dart';
@@ skipping 41 matching lines @@
         context.sourceFactory.resolveUri(library.source, relativeUri);
     if (resolvedSource == null) {
       fail('Failed to resolve relative uri "$relativeUri"');
     }
     return resolvedSource.uri.toString();
   }
 
   @override
   void serializeLibraryElement(LibraryElement library) {
     super.serializeLibraryElement(library);
+    uriToPublicNamespace[library.source.uri.toString()] =
+        unlinkedUnits[0].publicNamespace;
     Map<String, UnlinkedUnit> uriToUnit = <String, UnlinkedUnit>{};
     expect(unlinkedUnits.length, unitUris.length);
     for (int i = 1; i < unlinkedUnits.length; i++) {
       uriToUnit[unitUris[i]] = unlinkedUnits[i];
     }
     UnlinkedUnit getPart(String relativeUri) {
       String absoluteUri = resolveToAbsoluteUri(library, relativeUri);
       UnlinkedUnit unit = uriToUnit[absoluteUri];
       if (unit == null) {
         fail('Prelinker unexpectedly requested unit for "$relativeUri"'
@@ skipping 13 matching lines @@
             ' (resolves to "$absoluteUri").'
             '  Namespaces available: ${uriToPublicNamespace.keys}');
       }
       return namespace;
     }
     linked = new LinkedLibrary.fromBuffer(
         prelink(unlinkedUnits[0], getPart, getImport).toBuffer());
     validateLinkedLibrary(linked);
   }
 }