Revert of Remove webrtc/libjingle/{xmllite,xmpp}

webrtc/libjingle/xmpp/mucroomdiscoverytask.h

Index: webrtc/libjingle/xmpp/mucroomdiscoverytask.h
diff --git a/webrtc/libjingle/xmpp/mucroomdiscoverytask.h b/webrtc/libjingle/xmpp/mucroomdiscoverytask.h
new file mode 100644
index 0000000000000000000000000000000000000000..3e332bd297e578a002752b462b0106cfafcee819
--- /dev/null
+++ b/webrtc/libjingle/xmpp/mucroomdiscoverytask.h
@@ -0,0 +1,41 @@
+/*
+ *  Copyright 2012 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_LIBJINGLE_XMPP_MUCROOMDISCOVERYTASK_H_
+#define WEBRTC_LIBJINGLE_XMPP_MUCROOMDISCOVERYTASK_H_
+
+#include <map>
+#include <string>
+#include "webrtc/libjingle/xmpp/iqtask.h"
+
+namespace buzz {
+
+// This task requests the feature capabilities of the room. It is based on
+// XEP-0030, and extended using XEP-0004.
+class MucRoomDiscoveryTask : public IqTask {
+ public:
+  MucRoomDiscoveryTask(XmppTaskParentInterface* parent,
+                       const Jid& room_jid);
+
+  // Signal (exists, name, conversationId, features, extended_info)
+  sigslot::signal6<MucRoomDiscoveryTask*,
+                   bool,
+                   const std::string&,
+                   const std::string&,
+                   const std::set<std::string>&,
+                   const std::map<std::string, std::string>& > SignalResult;
+
+ protected:
+  virtual void HandleResult(const XmlElement* stanza);
+};
+
+}  // namespace buzz
+
+#endif  // WEBRTC_LIBJINGLE_XMPP_MUCROOMDISCOVERYTASK_H_