Defer execution of the main isolate's entry point until the message loop.

tests/lib/mirrors/invocation_fuzz_test.dart

 // Copyright (c) 2014, 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.
 
 // This test reflectively enumerates all the methods in the system and tries to
 // invoke them will all nulls. This may result in Dart exceptions or hangs, but
 // should never result in crashes or JavaScript exceptions.
 
 library test.invoke_natives;
 
 import 'dart:mirrors';
 import 'dart:async';
 import 'package:expect/expect.dart';
 
 // Methods to be skipped, by qualified name.
 var blacklist = [
   // Don't recurse on this test.
   'test.invoke_natives',
 
   // Don't exit the test pre-maturely.
   'dart.io.exit',
 
   // Don't run blocking io calls.
   new RegExp(r".*Sync$"),
 
   // These prevent the test from exiting.
   'dart.async._scheduleAsyncCallback',
   'dart.async._setTimerFactoryClosure',
 
+  'dart.isolate._startMainIsolate',
   'dart.isolate._startIsolate',
   'dart.io.sleep',
   'dart.io.HttpServer.HttpServer.listenOn',
 
   // These either cause the VM to segfault or throw uncatchable API errors.
   // TODO(15274): Fix them and remove from blacklist.
   'dart.io._IOService.dispatch',
   new RegExp(r'.*_RandomAccessFile.*'),
   'dart.io._StdIOUtils._socketType',
   'dart.io._StdIOUtils._getStdioOutputStream',
@@ skipping 115 matching lines @@
      0, 0xEFFFFFF, 0xFFFFFFFF, 0xFFFFFFFFFFFFFFFF,
      "foo", 'blåbærgrød', 'Îñţérñåţîöñåļîžåţîờñ'];
   valueObjects.forEach((v) => checkInstance(reflect(v), 'value object'));
 
   uncaughtErrorHandler(self, parent, zone, error, stack) {};
   var zoneSpec =
      new ZoneSpecification(handleUncaughtError: uncaughtErrorHandler);
   testZone = Zone.current.fork(specification: zoneSpec);
   testZone.createTimer(Duration.ZERO, doOneTask);
 }