- Implement package map parameter when spawning isolate.

runtime/lib/isolate_patch.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.
 
 import "dart:collection" show HashMap;
 import "dart:_internal";
 
 patch class ReceivePort {
   /* patch */ factory ReceivePort() = _ReceivePortImpl;
 
@@ skipping 316 matching lines @@
       {bool paused: false,
        SendPort onExit,
        SendPort onError,
        bool errorsAreFatal,
        bool checked,
        Map<String, String> environment,
        Uri packageRoot,
        Map<String, Uri> packages}) {
     RawReceivePort readyPort;
     if (environment != null) throw new UnimplementedError("environment");
-    if (packages != null) throw new UnimplementedError("packages");
     try {
       // The VM will invoke [_startIsolate] and not `main`.
-      // TODO: Handle [packages].
       readyPort = new RawReceivePort();
       var packageRootString =
           (packageRoot == null) ? null : packageRoot.toString();
       var packagesList = null;
+      if (packages != null) {
+        packagesList = new List(2 * packages.length);
+        var i = 0;
+        packages.forEach((key, value) {
+          packagesList[i++] = key;
+          packagesList[i++] = Uri.base.resolveUri(value).toString();
+        });
+      }
 
       _spawnUri(readyPort.sendPort, uri.toString(),
                 args, message,
                 paused, onExit, onError,
                 errorsAreFatal, checked,
                 null, /* environment */
                 packageRootString, packagesList);
       Completer completer = new Completer<Isolate>.sync();
       readyPort.handler = (readyMessage) {
         readyPort.close();
@@ skipping 128 matching lines @@
   static Isolate _getCurrentIsolate() {
     List portAndCapabilities = _getPortAndCapabilitiesOfCurrentIsolate();
     return new Isolate(portAndCapabilities[0],
                        pauseCapability: portAndCapabilities[1],
                        terminateCapability: portAndCapabilities[2]);
   }
 
   static List _getPortAndCapabilitiesOfCurrentIsolate()
       native "Isolate_getPortAndCapabilitiesOfCurrentIsolate";
 }