base::Bind: Convert Socket::Read.

net/udp/udp_socket_libevent.h

Index: net/udp/udp_socket_libevent.h
diff --git a/net/udp/udp_socket_libevent.h b/net/udp/udp_socket_libevent.h
index 1b823c76465d4c39f8e1574467fafc5284c8fc7a..6cef1c0273c3890bf2669a22515781e2ac964f5e 100644
--- a/net/udp/udp_socket_libevent.h
+++ b/net/udp/udp_socket_libevent.h
@@ -55,6 +55,7 @@ class UDPSocketLibevent : public base::NonThreadSafe {
   // Only usable from the client-side of a UDP socket, after the socket
   // has been connected.
   int Read(IOBuffer* buf, int buf_len, OldCompletionCallback* callback);
+  int Read(IOBuffer* buf, int buf_len, const CompletionCallback& callback);
 
   // Write to the socket.
   // Only usable from the client-side of a UDP socket, after the socket
@@ -78,6 +79,10 @@ class UDPSocketLibevent : public base::NonThreadSafe {
                int buf_len,
                IPEndPoint* address,
                OldCompletionCallback* callback);
+  int RecvFrom(IOBuffer* buf,
+               int buf_len,
+               IPEndPoint* address,
+               const CompletionCallback& callback);
 
   // Send to a socket with a particular destination.
   // |buf| is the buffer to send
@@ -114,7 +119,7 @@ class UDPSocketLibevent : public base::NonThreadSafe {
     // MessageLoopForIO::Watcher methods
 
     virtual void OnFileCanReadWithoutBlocking(int /* fd */) OVERRIDE {
-      if (socket_->read_callback_)
+      if (socket_->old_read_callback_ || !socket_->read_callback_.is_null())
         socket_->DidCompleteRead();
     }
 
@@ -209,7 +214,8 @@ class UDPSocketLibevent : public base::NonThreadSafe {
   scoped_ptr<IPEndPoint> send_to_address_;
 
   // External callback; called when read is complete.
-  OldCompletionCallback* read_callback_;
+  OldCompletionCallback* old_read_callback_;
+  CompletionCallback read_callback_;
 
   // External callback; called when write is complete.
   OldCompletionCallback* write_callback_;