Allow Platform.executable for JIT app snapshots.

tests/standalone/http_launch_test.dart

 // Copyright (c) 2013, 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.
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
+// OtherResources=http_launch_data/http_isolate_main.dart
+// OtherResources=http_launch_data/http_launch_main.dart
+// OtherResources=http_launch_data/http_spawn_main.dart
+// OtherResources=http_launch_data/packages/simple/simple.dart
 //
 // Test:
 //   *) Launching a script fetched over HTTP.
 //   *) Importing a library fetched over HTTP.
 //   *) Automatically resolving package_root when script is fetched over HTTP.
 //   *) Spawning a URI over HTTP.
 
 library http_launch_test;
 
 import 'dart:async';
@@ skipping 71 matching lines @@
   Expect.isTrue(stdout.startsWith('hello'));
   // Same output from all three process runs.
   for (int i = 0; i < results.length; i++) {
     Expect.equals(stdout, results[i].stdout);
   }
 }
 
 main() {
   HttpServer.bind(InternetAddress.LOOPBACK_IP_V4, 0).then(serverRunning);
 }