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

mojo/edk/system/master_impl.h

+// 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_SYSTEM_MASTER_IMPL_H_
+#define MOJO_EDK_SYSTEM_MASTER_IMPL_H_
+
+#include "base/process/process.h"
+#include "mojo/edk/system/master.mojom.h"
+#include "mojo/edk/system/system_impl_export.h"
+#include "mojo/public/cpp/system/macros.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
+
+namespace mojo {
+namespace edk {
+
+// An instance of this class exists in the maste process for each slave process.
+class MOJO_SYSTEM_IMPL_EXPORT MasterImpl : public Master {
+ public:
+  explicit MasterImpl(base::ProcessId slave_pid);
+  ~MasterImpl() override;
+
+  // Master implementation:
+  void HandleToToken(ScopedHandle platform_handle,
+                     const HandleToTokenCallback& callback) override;
+  void TokenToHandle(uint64_t token,
+                     const TokenToHandleCallback& callback) override;
+
+ private:
+#if defined(OS_WIN)
+  base::Process slave_process_;
+#endif
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(MasterImpl);
+};
+
+}  // namespace edk
+}  // namespace mojo
+
+#endif  // MOJO_EDK_SYSTEM_MASTER_IMPL_H_