Add a Mojo EDK for Chrome that uses one OS pipe per message pipe.

mojo/edk/system/message_pipe_test_utils.cc

Index: mojo/edk/system/message_pipe_test_utils.cc
diff --git a/mojo/edk/system/message_pipe_test_utils.cc b/mojo/edk/system/message_pipe_test_utils.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9a18f55d084432db642fa186cd97c2c99bcfaca8
--- /dev/null
+++ b/mojo/edk/system/message_pipe_test_utils.cc
@@ -0,0 +1,32 @@
+// 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 "mojo/edk/system/message_pipe_test_utils.h"
+
+#include "mojo/edk/system/test_utils.h"
+
+namespace mojo {
+namespace system {
+namespace test {
+
+#if !defined(OS_IOS)
+MultiprocessMessagePipeTestBase::MultiprocessMessagePipeTestBase()
+    : test_io_thread_(base::TestIOThread::kAutoStart),
+      ipc_support_(test_io_thread_.task_runner()) {
+}
+
+MultiprocessMessagePipeTestBase::MultiprocessMessagePipeTestBase(
+    base::MessageLoop::Type main_message_loop_type)
+    : message_loop_(main_message_loop_type),
+      test_io_thread_(base::TestIOThread::kAutoStart),
+      ipc_support_(test_io_thread_.task_runner()) {
+}
+
+MultiprocessMessagePipeTestBase::~MultiprocessMessagePipeTestBase() {
+}
+#endif
+
+}  // namespace test
+}  // namespace system
+}  // namespace mojo