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

mojo/edk/system/awakable.h

 // Copyright 2013 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_AWAKABLE_H_
 #define MOJO_EDK_SYSTEM_AWAKABLE_H_
 
 #include <stdint.h>
 
 #include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/c/system/types.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 
 // An interface that may be waited on |AwakableList|.
 class MOJO_SYSTEM_IMPL_EXPORT Awakable {
  public:
   // |Awake()| must satisfy the following contract:
   // * As this is called from any thread, this must be thread-safe.
   // * As this is called inside a lock, this must not call anything that takes
   //   "non-terminal" locks, i.e., those which are always safe to take.
   // This should return false if this must not be called again for the same
   // reason (e.g., for the same call to |AwakableList::Add()|).
   virtual bool Awake(MojoResult result, uintptr_t context) = 0;
 
  protected:
   Awakable() {}
 };
 
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_AWAKABLE_H_