Add more (incomplete) diagnostic support to the status pages

pkg/analyzer/lib/src/generated/source.dart

 // Copyright (c) 2014, 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 engine.source;
 
 import 'dart:collection';
 import "dart:math" as math;
 
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 650 matching lines @@
       return packageMap;
     }
 
     // Default to the PackageMapUriResolver.
     PackageMapUriResolver resolver = _resolvers
         .firstWhere((r) => r is PackageMapUriResolver, orElse: () => null);
     return resolver != null ? resolver.packageMap : null;
   }
 
   /**
+   * Return a source factory that will resolve URI's in the same way that this
+   * source factory does.
+   */
+  SourceFactory clone() {
+    SourceFactory factory =
+        new SourceFactory(_resolvers, _packages, _resourceProvider);
+    factory.localSourcePredicate = _localSourcePredicate;
+    return factory;
+  }
+
+  /**
    * Return a source object representing the given absolute URI, or `null` if the URI is not a
    * valid URI or if it is not an absolute URI.
    *
    * @param absoluteUri the absolute URI to be resolved
    * @return a source object representing the absolute URI
    */
   Source forUri(String absoluteUri) {
     try {
       Uri uri = parseUriWithException(absoluteUri);
       if (uri.isAbsolute) {
@@ skipping 407 matching lines @@
   Source resolveAbsolute(Uri uri, [Uri actualUri]);
 
   /**
    * Return an absolute URI that represents the given [source], or `null` if a
    * valid URI cannot be computed.
    *
    * The computation should be based solely on [source.fullName].
    */
   Uri restoreAbsolute(Source source) => null;
 }