Add multiplexing of message pipes in the new EDK.

mojo/edk/system/run_all_unittests.cc

 // Copyright 2014 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/bind.h"
 #include "base/command_line.h"
 #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/multiprocess_test_helper.h"
+#include "mojo/edk/test/scoped_ipc_support.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 int main(int argc, char** argv) {
 // Silence death test thread warnings on Linux. We can afford to run our death
 // tests a little more slowly (< 10 ms per death test on a Z620).
 // On android, we need to run in the default mode, as the threadsafe mode
 // relies on execve which is not available.
 #if !defined(OS_ANDROID)
   testing::GTEST_FLAG(death_test_style) = "threadsafe";
 #endif
   base::TestSuite test_suite(argc, argv);
 
   // Must be run before mojo::edk::Init.
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           mojo::edk::test::kBrokerHandleSwitch)) {
     mojo::edk::PreInitializeChildProcess();
   }
 
   // TODO(use_chrome_edk): temporary to force new EDK.
   base::CommandLine::ForCurrentProcess()->AppendSwitch("--use-new-edk");
 
   mojo::edk::Init();
 
+  base::TestIOThread test_io_thread(base::TestIOThread::kAutoStart);
+  // Leak this because its destructor calls mojo::edk::ShutdownIPCSupport which
+  // really does nothing in the new EDK but does depend on the current message
+  // loop, which is destructed inside base::LaunchUnitTests.
+  new mojo::edk::test::ScopedIPCSupport(test_io_thread.task_runner());
+
   return base::LaunchUnitTests(
       argc, argv,
       base::Bind(&base::TestSuite::Run, base::Unretained(&test_suite)));
 }