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

mojo/edk/embedder/embedder_internal.h

Index: mojo/edk/embedder/embedder_internal.h
diff --git a/mojo/edk/embedder/embedder_internal.h b/mojo/edk/embedder/embedder_internal.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.
+
+// This header contains internal details for the *implementation* of the
+// embedder API. It should not be included by any public header (nor by users of
+// the embedder API).
+
+#ifndef MOJO_EDK_EMBEDDER_EMBEDDER_INTERNAL_H_
+#define MOJO_EDK_EMBEDDER_EMBEDDER_INTERNAL_H_
+
+#include <stdint.h>
+
+namespace base {
+class TaskRunner;
+}
+
+namespace mojo {
+
+namespace edk {
+
+class Core;
+class PlatformSupport;
+class ProcessDelegate;
+
+namespace internal {
+
+// Instance of |PlatformSupport| to use.
+extern PlatformSupport* g_platform_support;
+
+// Instance of |Core| used by the system functions (|Mojo...()|).
+extern Core* g_core;
+extern base::TaskRunner* g_delegate_thread_task_runner;
+extern ProcessDelegate* g_process_delegate;
+extern base::TaskRunner* g_io_thread_task_runner;
+
+// Called on the IO thread.
+void ChannelStarted();
+void ChannelShutdown();
+}  // namespace internal
+
+}  // namepace edk
+
+}  // namespace mojo
+
+#endif  // MOJO_EDK_EMBEDDER_EMBEDDER_INTERNAL_H_