Mac: Give app_shim code a nicer home

apps/app_shim/unix_domain_socket_acceptor.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 APPS_APP_SHIM_UNIX_DOMAIN_SOCKET_ACCEPTOR_H_
-#define APPS_APP_SHIM_UNIX_DOMAIN_SOCKET_ACCEPTOR_H_
-
-#include "base/files/file_path.h"
-#include "base/message_loop/message_loop.h"
-#include "ipc/ipc_channel_handle.h"
-
-namespace apps {
-
-// A UnixDomainSocketAcceptor listens on a UNIX domain socket. When a
-// client connects to the socket, it accept()s the connection and
-// passes the new FD to the delegate. The delegate is then responsible
-// for creating a new IPC::Channel for the FD.
-class UnixDomainSocketAcceptor : public base::MessageLoopForIO::Watcher {
- public:
-  class Delegate {
-   public:
-    // Called when a client connects to the factory. It is the delegate's
-    // responsibility to create an IPC::Channel for the handle, or else close
-    // the file descriptor contained therein.
-    virtual void OnClientConnected(const IPC::ChannelHandle& handle) = 0;
-
-    // Called when an error occurs and the channel is closed.
-    virtual void OnListenError() = 0;
-  };
-
-  UnixDomainSocketAcceptor(const base::FilePath& path, Delegate* delegate);
-
-  virtual ~UnixDomainSocketAcceptor();
-
-  // Call this to start listening on the socket.
-  bool Listen();
-
-  // Close and unlink the socket, and stop accepting connections.
-  void Close();
-
- private:
-  bool CreateSocket();
-  virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
-  virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE;
-
-  base::MessageLoopForIO::FileDescriptorWatcher
-      server_listen_connection_watcher_;
-  base::FilePath path_;
-  Delegate* delegate_;
-  int listen_fd_;
-
-  DISALLOW_COPY_AND_ASSIGN(UnixDomainSocketAcceptor);
-};
-
-}  // namespace apps
-
-#endif  // APPS_APP_SHIM_UNIX_DOMAIN_SOCKET_ACCEPTOR_H_