Add P2PDatagramSocket and P2PStreamSocket interfaces.

remoting/protocol/p2p_datagram_socket.h

Index: remoting/protocol/p2p_datagram_socket.h
diff --git a/remoting/protocol/p2p_datagram_socket.h b/remoting/protocol/p2p_datagram_socket.h
new file mode 100644
index 0000000000000000000000000000000000000000..13662232c87cef3e8a42649fff402c96928d4f38
--- /dev/null
+++ b/remoting/protocol/p2p_datagram_socket.h
@@ -0,0 +1,49 @@
+// 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 REMOTING_PROTOCOL_P2P_DATAGRAM_SOCKET_H_
+#define REMOTING_PROTOCOL_P2P_DATAGRAM_SOCKET_H_
+
+#include "net/base/completion_callback.h"
+
+namespace net {
+class IOBuffer;
+}  // namespace net
+
+namespace remoting {
+namespace protocol {
+
+// Peer-to-peer socket with datagram semantics.
+class P2PDatagramSocket {
+ public:
+  virtual ~P2PDatagramSocket() {};
+
+  // Receives a packet, up to |buf_len| bytes, from the socket. Size of the
+  // incoming packet is returned in case of success. If the packet is larger
+  // than |buf_len| then it is truncated, i.e. only the first |buf_len| bytes
+  // are stored in the buffer. In case of failure a net error code is returned.
+  // ERR_IO_PENDING is returned if the operation could not be completed
+  // synchronously, in which case the result will be passed to the callback when
+  // available. If the operation is not completed immediately, the socket
+  // acquires a reference to the provided buffer until the callback is invoked
+  // or the socket is closed. If the socket is destroyed before the read
+  // completes, the callback will not be invoked.
+  virtual int Recv(const scoped_refptr<net::IOBuffer>& buf, int buf_len,
+                   const net::CompletionCallback& callback) = 0;
+
+  // Sends a packet. Returns |buf_len| to indicate success, otherwise a net
+  // error code is returned. ERR_IO_PENDING is returned if the operation could
+  // not be completed synchronously, in which case the result will be passed to
+  // the callback when available. If the operation is not completed immediately,
+  // the socket acquires a reference to the provided buffer until the callback
+  // is invoked or the socket is closed. Implementations of this method should
+  // not modify the contents of the actual buffer that is written to the socket.
+  virtual int Send(const scoped_refptr<net::IOBuffer>& buf, int buf_len,
+                   const net::CompletionCallback& callback) = 0;
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_P2P_DATAGRAM_SOCKET_H_