Fix build. Fix tests.

runtime/bin/vmservice/loader.dart

Index: runtime/bin/vmservice/loader.dart
diff --git a/runtime/bin/vmservice/loader.dart b/runtime/bin/vmservice/loader.dart
index 389c665f979d2fbb28c0cf4ac0b2c98bf20bbc3c..bf5af113a0e248312e8766eafcb65c1661afa1d7 100644
--- a/runtime/bin/vmservice/loader.dart
+++ b/runtime/bin/vmservice/loader.dart
@@ -346,7 +346,7 @@ void _sendExtensionImportResponse(SendPort sp,
                                   Uri uri,
                                   String libraryUrl,
                                   String resolvedUri) {
-  var msg = new List(4);
+  var msg = new List(5);
   int tag = _Dart_kImportExtension;
   if (resolvedUri == null) {
     // We could not resolve the dart-ext: uri.
@@ -355,8 +355,9 @@ void _sendExtensionImportResponse(SendPort sp,
   }
   msg[0] = tag;
   msg[1] = uri.toString();
-  msg[2] = libraryUrl;
-  msg[3] = resolvedUri;
+  msg[2] = resolvedUri;
+  msg[3] = libraryUrl;
+  msg[4] = resolvedUri;
   sp.send(msg);
 }