Make browser tests all run from a server instead of the local filesystem.

samples/swarm/DataSource.dart

 // Copyright (c) 2011, 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.
 
 part of swarmlib;
 
 /** The top-level collection of all sections for a user. */
 // TODO(jimhug): This is known as UserData in the server model.
 class Sections extends Collection<Section> {
   final List<Section> _sections;
@@ skipping 38 matching lines @@
     final decoder = new Decoder(data);
     int nSections = decoder.readInt();
     final sections = new List<Section>();
 
     for (int i=0; i < nSections; i++) {
       sections.add(Section.decode(decoder));
     }
     callback(new Sections(sections));
   }
 
-  static void initializeFromUrl(void callback(Sections sections)) {
-    if (Sections.runningFromFile) {
+  static void initializeFromUrl(bool useCannedData,
+                                void callback(Sections sections)) {
+    if (Sections.runningFromFile || useCannedData) {
       initializeFromData(CannedData.data['user.data'], callback);
     } else {
       // TODO(jmesserly): display an error if we fail here! Silent failure bad.
       new HttpRequest.get('data/user.data',
           EventBatch.wrap((request) {
         // TODO(jimhug): Nice response if get error back from server.
         // TODO(jimhug): Might be more efficient to parse request in sections.
         initializeFromData(request.responseText, callback);
       }));
     }
@@ skipping 163 matching lines @@
     final hasThumbnail = decoder.readBool();
     final author = decoder.readString();
     final dateInSeconds = decoder.readInt();
     final snippet = decoder.readString();
     final date =
         new Date.fromMillisecondsSinceEpoch(dateInSeconds*1000, isUtc: true);
     return new Article(source, id, date, title, author, srcUrl, hasThumbnail,
         snippet);
   }
 }