domain: use AsyncListener API

The domain module has been switched over to use the domain module API as
much as currently possible. There are still some hooks in the
EventEmitter, but hopefully we can remove those in the future.

lib/_http_client.js

@@ -417,38 +417,45 @@ function responseOnEnd() {
   }
 }
 
+function tickOnSocket(req, socket) {
+  var parser = parsers.alloc();
+  req.socket = socket;
+  req.connection = socket;
+  parser.reinitialize(HTTPParser.RESPONSE);
+  parser.socket = socket;
+  parser.incoming = null;
+  req.parser = parser;
+
+  socket.parser = parser;
+  socket._httpMessage = req;
+
+  // Setup "drain" propogation.
+  httpSocketSetup(socket);
+
+  // Propagate headers limit from request object to parser
+  if (util.isNumber(req.maxHeadersCount)) {
+    parser.maxHeaderPairs = req.maxHeadersCount << 1;
+  } else {
+    // Set default value because parser may be reused from FreeList
+    parser.maxHeaderPairs = 2000;
+  }
+
+  parser.onIncoming = parserOnIncomingClient;
+  socket.on('error', socketErrorListener);
+  socket.on('data', socketOnData);
+  socket.on('end', socketOnEnd);
+  socket.on('close', socketCloseListener);
+  req.emit('socket', socket);
+}
+
 ClientRequest.prototype.onSocket = function(socket) {
   var req = this;
 
   process.nextTick(function() {
-    var parser = parsers.alloc();
-    req.socket = socket;
-    req.connection = socket;
-    parser.reinitialize(HTTPParser.RESPONSE);
-    parser.socket = socket;
-    parser.incoming = null;
-    req.parser = parser;
-
-    socket.parser = parser;
-    socket._httpMessage = req;
-
-    // Setup "drain" propogation.
-    httpSocketSetup(socket);
-
-    // Propagate headers limit from request object to parser
-    if (util.isNumber(req.maxHeadersCount)) {
-      parser.maxHeaderPairs = req.maxHeadersCount << 1;
-    } else {
-      // Set default value because parser may be reused from FreeList
-      parser.maxHeaderPairs = 2000;
-    }
-
-    parser.onIncoming = parserOnIncomingClient;
-    socket.on('error', socketErrorListener);
-    socket.on('data', socketOnData);
-    socket.on('end', socketOnEnd);
-    socket.on('close', socketCloseListener);
-    req.emit('socket', socket);
+    // If a domain was added to the request, attach it to the socket.
+    if (req.domain)
+      socket._handle.addAsyncListener(req.domain._listener);
+    tickOnSocket(req, socket);
   });
 
 };