Fix the generation of URIs for scripts

pkg/analyzer/lib/src/task/html.dart

 // Copyright (c) 2015, 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.src.task.html;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart';
@@ skipping 62 matching lines @@
   @override
   bool get isInSystemLibrary => source.isInSystemLibrary;
 
   @override
   int get modificationStamp => source.modificationStamp;
 
   @override
   String get shortName => source.shortName;
 
   @override
-  Uri get uri =>
-      source.uri.replace(queryParameters: {'offset': fragments[0].offset});
+  Uri get uri => source.uri
+      .replace(queryParameters: {'offset': fragments[0].offset.toString()});
 
   @override
   UriKind get uriKind =>
       throw new StateError('uriKind not supported for scripts');
 
   @override
   bool exists() => source.exists();
 }
 
 /**
@@ skipping 317 matching lines @@
    * The content of the fragment.
    */
   final String content;
 
   /**
    * Initialize a newly created script fragment to have the given [offset] and
    * [content].
    */
   ScriptFragment(this.offset, this.line, this.column, this.content);
 }