Add additional Schedule heartbeat calls.

sdk/lib/_internal/pub/lib/src/hosted_source.dart

 // Copyright (c) 2012, 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 hosted_source;
 
 import 'dart:async';
 import 'dart:io' as io;
 import 'dart:json' as json;
 import 'dart:uri';
@@ skipping 18 matching lines @@
   final shouldCache = true;
 
   /// Downloads a list of all versions of a package that are available from the
   /// site.
   Future<List<Version>> getVersions(String name, description) {
     var url = _makeUrl(description,
         (server, package) => "$server/packages/$package.json");
 
     log.io("Get versions from $url.");
     return httpClient.read(url).then((body) {
-      log.io("Versions JSON from $url: $body.");
       var doc = json.parse(body);
-      var versions = doc['versions']
+      return doc['versions']
           .map((version) => new Version.parse(version))
           .toList();
-      log.io("Versions from $url: $versions.");
-      return versions;
     }).catchError((ex) {
       var parsed = _parseDescription(description);
       _throwFriendlyError(ex, parsed.first, parsed.last);
     });
   }
 
   /// Downloads and parses the pubspec for a specific version of a package that
   /// is available from the site.
   Future<Pubspec> describe(PackageId id) {
     // Request it from the server.
@@ skipping 197 matching lines @@
   }
 
   var name = description["name"];
   if (name is! String) {
     throw new FormatException("The 'name' key must have a string value.");
   }
 
   var url = description.containsKey("url") ? description["url"] : _defaultUrl;
   return new Pair<String, String>(name, url);
 }