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

ipc/mojo/ipc_channel_mojo.h

 // 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 IPC_IPC_CHANNEL_MOJO_H_
 #define IPC_IPC_CHANNEL_MOJO_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/lock.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_channel_factory.h"
 #include "ipc/ipc_export.h"
 #include "ipc/mojo/ipc_message_pipe_reader.h"
 #include "ipc/mojo/ipc_mojo_bootstrap.h"
 #include "ipc/mojo/scoped_ipc_support.h"
+#include "third_party/mojo/src/mojo/public/cpp/system/core.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/core.h"
+#endif
 
 namespace IPC {
 
 // Mojo-based IPC::Channel implementation over a platform handle.
 //
 // ChannelMojo builds Mojo MessagePipe using underlying pipe given by
 // "bootstrap" IPC::Channel which creates and owns platform pipe like
 // named socket. The bootstrap Channel is used only for establishing
 // the underlying connection. ChannelMojo takes its handle over once
 // the it is made and puts MessagePipe on it.
@@ skipping 14 matching lines @@
 // TODO(morrita): Add APIs to create extra MessagePipes to let
 //                Mojo-based objects talk over this Channel.
 //
 class IPC_MOJO_EXPORT ChannelMojo
     : public Channel,
       public MojoBootstrap::Delegate,
       public NON_EXPORTED_BASE(internal::MessagePipeReader::Delegate) {
  public:
   using CreateMessagingPipeCallback =
       base::Callback<void(mojo::ScopedMessagePipeHandle)>;
+#if !defined(USE_CHROME_EDK)
   using CreateMessagingPipeOnIOThreadCallback =
       base::Callback<void(mojo::ScopedMessagePipeHandle,
                           mojo::embedder::ChannelInfo*)>;
+#endif
 
   // True if ChannelMojo should be used regardless of the flag.
   static bool ShouldBeUsed();
 
   // Create ChannelMojo. A bootstrap channel is created as well.
   // |broker| must outlive the newly created channel.
   static scoped_ptr<ChannelMojo> Create(
       scoped_refptr<base::TaskRunner> io_runner,
       const ChannelHandle& channel_handle,
       Mode mode,
@@ skipping 52 matching lines @@
   void OnMessageReceived(Message& message) override;
   void OnPipeClosed(internal::MessagePipeReader* reader) override;
   void OnPipeError(internal::MessagePipeReader* reader) override;
 
  protected:
   ChannelMojo(scoped_refptr<base::TaskRunner> io_runner,
               const ChannelHandle& channel_handle,
               Mode mode,
               Listener* listener,
               AttachmentBroker* broker);
-
+#if defined(USE_CHROME_EDK)
+  void CreateMessagingPipe(mojo::edk::ScopedPlatformHandle handle,
+                           const CreateMessagingPipeCallback& callback);
+#else
   void CreateMessagingPipe(mojo::embedder::ScopedPlatformHandle handle,
                            const CreateMessagingPipeCallback& callback);
+#endif
   void InitMessageReader(mojo::ScopedMessagePipeHandle pipe, int32_t peer_pid);
 
   Listener* listener() const { return listener_; }
   void set_peer_pid(base::ProcessId pid) { peer_pid_ = pid; }
 
  private:
+#if !defined(USE_CHROME_EDK)
   struct ChannelInfoDeleter {
     explicit ChannelInfoDeleter(scoped_refptr<base::TaskRunner> io_runner);
     ~ChannelInfoDeleter();
 
     void operator()(mojo::embedder::ChannelInfo* ptr) const;
 
     scoped_refptr<base::TaskRunner> io_runner;
   };
+#endif
 
   // ChannelMojo needs to kill its MessagePipeReader in delayed manner
   // because the channel wants to kill these readers during the
   // notifications invoked by them.
   typedef internal::MessagePipeReader::DelayedDeleter ReaderDeleter;
 
   void InitOnIOThread();
 
+#if !defined(USE_CHROME_EDK)
   static void CreateMessagingPipeOnIOThread(
       mojo::embedder::ScopedPlatformHandle handle,
       scoped_refptr<base::TaskRunner> callback_runner,
       const CreateMessagingPipeOnIOThreadCallback& callback);
   void OnMessagingPipeCreated(const CreateMessagingPipeCallback& callback,
                               mojo::ScopedMessagePipeHandle handle,
                               mojo::embedder::ChannelInfo* channel_info);
+#endif
 
   scoped_ptr<MojoBootstrap> bootstrap_;
   Listener* listener_;
   base::ProcessId peer_pid_;
   scoped_refptr<base::TaskRunner> io_runner_;
+#if !defined(USE_CHROME_EDK)
   scoped_ptr<mojo::embedder::ChannelInfo,
              ChannelInfoDeleter> channel_info_;
+#endif
 
   // Guards |message_reader_|, |waiting_connect_| and |pending_messages_|
   //
   // * The contents of |pending_messages_| can be modified from any thread.
   // * |message_reader_| is modified only from the IO thread,
   //   but they can be referenced from other threads.
   base::Lock lock_;
   scoped_ptr<internal::MessagePipeReader, ReaderDeleter> message_reader_;
   ScopedVector<Message> pending_messages_;
   bool waiting_connect_;
 
   scoped_ptr<ScopedIPCSupport> ipc_support_;
 
   base::WeakPtrFactory<ChannelMojo> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChannelMojo);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_MOJO_H_