[WIP] Add DCHECK for mojo::edk::Init().

services/service_manager/public/cpp/test/run_all_service_tests.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/test/launcher/unit_test_launcher.h"
+#include "base/test/test_io_thread.h"
 #include "base/test/test_suite.h"
 #include "mojo/edk/embedder/embedder.h"
+#include "mojo/edk/test/scoped_ipc_support.h"
 #include "services/service_manager/background/background_service_manager_main.h"
 
 int MasterProcessMain(int argc, char** argv) {
   base::TestSuite test_suite(argc, argv);
+
   mojo::edk::Init();
+  base::TestIOThread test_io_thread(base::TestIOThread::kAutoStart);
+  mojo::edk::test::ScopedIPCSupport ipc_support(test_io_thread.task_runner());
+
   return base::LaunchUnitTests(
       argc, argv,
       base::Bind(&base::TestSuite::Run, base::Unretained(&test_suite)));
 }