Implement IPC::ChannelFactory, a class that accept()s on a UNIX socket.

ipc/ipc_channel_factory.h

Index: ipc/ipc_channel_factory.h
diff --git a/ipc/ipc_channel_factory.h b/ipc/ipc_channel_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..5db520c0d16bd5e39cf2533558c4cd91fa4fae39
--- /dev/null
+++ b/ipc/ipc_channel_factory.h
@@ -0,0 +1,40 @@
+// 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 IPC_IPC_CHANNEL_FACTORY_H_
+#define IPC_IPC_CHANNEL_FACTORY_H_
+
+#include "base/files/file_path.h"
+#include "base/message_loop.h"
+#include "ipc/ipc_channel_handle.h"
+
+namespace IPC {
+
+class ChannelFactory : public MessageLoopForIO::Watcher {
+ public:
+  class Delegate {
+   public:
+    // Called when a client connects to the factory.
+    virtual void OnClientConnected(const ChannelHandle& handle) = 0;
+  };
+
+  ChannelFactory(const std::string& path, Delegate* delegate);
+
+  bool Listen();
+ private:
+  bool CreatePipe();
+  virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
+  virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE {}
+
+  MessageLoopForIO::FileDescriptorWatcher server_listen_connection_watcher_;
+  base::FilePath path_;
+  Delegate* delegate_;
+  int listen_pipe_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChannelFactory);
+};
+
+}
+
+#endif  // IPC_IPC_CHANNEL_FACTORY_H_