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

content/common/mojo/channel_init.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 CONTENT_COMMON_MOJO_CHANNEL_INIT_H_
 #define CONTENT_COMMON_MOJO_CHANNEL_INIT_H_
 
 #include "base/files/file.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "content/common/content_export.h"
 #include "ipc/mojo/scoped_ipc_support.h"
+#include "third_party/mojo/src/mojo/public/cpp/system/message_pipe.h"
+
+#if !defined(USE_CHROME_EDK)
 #include "third_party/mojo/src/mojo/edk/embedder/channel_info_forward.h"
-#include "third_party/mojo/src/mojo/public/cpp/system/message_pipe.h"
+#endif
 
 namespace base {
 class TaskRunner;
 }
 
 namespace content {
 
 // ChannelInit handles creation and destruction of the Mojo channel. It is not
 // thread-safe, but may be used on any single thread with a MessageLoop.
 class CONTENT_EXPORT ChannelInit {
  public:
   ChannelInit();
   ~ChannelInit();
 
   // Initializes the channel. This takes ownership of |file|. Returns the
   // primordial MessagePipe for the channel.
   mojo::ScopedMessagePipeHandle Init(
       base::PlatformFile file,
       scoped_refptr<base::TaskRunner> io_thread_task_runner);
 
   // Notifies the channel that we (hence it) will soon be destroyed.
   void WillDestroySoon();
 
   // Shuts down the channel. Must be called from the IO thread.
   void ShutdownOnIOThread();
 
  private:
+#if !defined(USE_CHROME_EDK)
   // Invoked on the thread on which this object lives once the channel has been
   // established. This is a static method that takes a weak pointer to self,
   // since we want to destroy the channel if we were destroyed first.
   static void OnCreatedChannel(
       base::WeakPtr<ChannelInit> self,
       scoped_ptr<IPC::ScopedIPCSupport> ipc_support,
       mojo::embedder::ChannelInfo* channel);
 
   // If non-null the channel has been established.
   mojo::embedder::ChannelInfo* channel_info_;
+#endif
 
   scoped_ptr<IPC::ScopedIPCSupport> ipc_support_;
   base::WeakPtrFactory<ChannelInit> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChannelInit);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_MOJO_CHANNEL_INIT_H_