Mojo: Add the beginnings of a proper embedder API.

mojo/system/embedder.h

Index: mojo/system/embedder.h
diff --git a/mojo/system/embedder.h b/mojo/system/embedder.h
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index 0000000000000000000000000000000000000000..2b67e81db1cccc13fecc3777032b8c37966c66da
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+++ b/mojo/system/embedder.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_SYSTEM_EMBEDDER_H_
+#define MOJO_SYSTEM_EMBEDDER_H_
+
+#include "mojo/system/system_impl_export.h"
+
+namespace mojo {
+namespace embedder {
+
+MOJO_SYSTEM_IMPL_EXPORT void Init();
+
+}  // namespace embedder
+}  // namespace mojo
+
+#endif  // MOJO_SYSTEM_EMBEDDER_H_