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

mojo/edk/test/scoped_ipc_support.h

Index: mojo/edk/test/scoped_ipc_support.h
diff --git a/mojo/edk/test/scoped_ipc_support.h b/mojo/edk/test/scoped_ipc_support.h
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+++ b/mojo/edk/test/scoped_ipc_support.h
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+// Copyright 2015 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_TEST_SCOPED_IPC_SUPPORT_H_
+#define MOJO_EDK_TEST_SCOPED_IPC_SUPPORT_H_
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "base/synchronization/waitable_event.h"
+#include "base/task_runner.h"
+#include "mojo/edk/embedder/process_delegate.h"
+#include "mojo/edk/embedder/scoped_platform_handle.h"
+#include "mojo/public/cpp/system/macros.h"
+
+namespace mojo {
+namespace edk {
+namespace test {
+
+namespace internal {
+
+class ScopedIPCSupportHelper {
+ public:
+  ScopedIPCSupportHelper();
+  ~ScopedIPCSupportHelper();
+
+  void Init(ProcessDelegate* process_delegate,
+            scoped_refptr<base::TaskRunner> io_thread_task_runner);
+
+  void OnShutdownCompleteImpl();
+
+ private:
+  scoped_refptr<base::TaskRunner> io_thread_task_runner_;
+
+  // Set after shut down.
+  base::WaitableEvent event_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(ScopedIPCSupportHelper);
+};
+
+}  // namespace internal
+
+// A simple class that calls |InitIPCSupport()| on construction and
+// |ShutdownIPCSupport()| on destruction (or |ShutdownIPCSupportOnIOThread()|
+// if destroyed on the I/O thread).
+class ScopedIPCSupport : public ProcessDelegate {
+ public:
+  explicit ScopedIPCSupport(
+      scoped_refptr<base::TaskRunner> io_thread_task_runner);
+  ~ScopedIPCSupport() override;
+
+ private:
+  // |ProcessDelegate| implementation:
+  // Note: Executed on the I/O thread.
+  void OnShutdownComplete() override;
+
+  internal::ScopedIPCSupportHelper helper_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(ScopedIPCSupport);
+};
+
+}  // namespace test
+}  // namespace edk
+}  // namespace mojo
+
+#endif  // MOJO_EDK_TEST_SCOPED_IPC_SUPPORT_H_