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

mojo/edk/system/message_pipe_test_utils.h

Index: mojo/edk/system/message_pipe_test_utils.h
diff --git a/mojo/edk/system/message_pipe_test_utils.h b/mojo/edk/system/message_pipe_test_utils.h
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index 0000000000000000000000000000000000000000..e067329d12b2e00f308da52efe621561e014d540
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+++ b/mojo/edk/system/message_pipe_test_utils.h
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+// 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.
+
+#ifndef MOJO_EDK_SYSTEM_MESSAGE_PIPE_TEST_UTILS_H_
+#define MOJO_EDK_SYSTEM_MESSAGE_PIPE_TEST_UTILS_H_
+
+#include "base/message_loop/message_loop.h"
+#include "base/test/test_io_thread.h"
+#include "mojo/edk/embedder/simple_platform_support.h"
+#include "mojo/edk/system/test_utils.h"
+#include "mojo/edk/test/multiprocess_test_helper.h"
+#include "mojo/edk/test/scoped_ipc_support.h"
+#include "mojo/public/cpp/system/macros.h"
+
+namespace mojo {
+namespace edk {
+
+class ChannelEndpoint;
+class MessagePipe;
+
+namespace test {
+
+#if !defined(OS_IOS)
+class MultiprocessMessagePipeTestBase : public testing::Test {
+ public:
+  MultiprocessMessagePipeTestBase();
+  MultiprocessMessagePipeTestBase(
+      base::MessageLoop::Type main_message_loop_type);
+  ~MultiprocessMessagePipeTestBase() override;
+
+ protected:
+  PlatformSupport* platform_support() { return &platform_support_; }
+  test::MultiprocessTestHelper* helper() { return &helper_; }
+
+ private:
+  SimplePlatformSupport platform_support_;
+  base::MessageLoop message_loop_;
+  base::TestIOThread test_io_thread_;
+  test::ScopedIPCSupport ipc_support_;
+  test::MultiprocessTestHelper helper_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(MultiprocessMessagePipeTestBase);
+};
+#endif
+
+}  // namespace test
+}  // namespace edk
+}  // namespace mojo
+
+#endif  // MOJO_EDK_SYSTEM_MESSAGE_PIPE_TEST_UTILS_H_