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

webrtc/libjingle/xmpp/pubsub_task.h

Index: webrtc/libjingle/xmpp/pubsub_task.h
diff --git a/webrtc/libjingle/xmpp/pubsub_task.h b/webrtc/libjingle/xmpp/pubsub_task.h
new file mode 100644
index 0000000000000000000000000000000000000000..b1923a0eb66fceae2c018a05d3059c7e7ef63f10
--- /dev/null
+++ b/webrtc/libjingle/xmpp/pubsub_task.h
@@ -0,0 +1,58 @@
+/*
+ *  Copyright 2004 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_PUBSUB_TASK_H_
+#define WEBRTC_LIBJINGLE_XMPP_PUBSUB_TASK_H_
+
+#include <map>
+#include <string>
+#include "webrtc/libjingle/xmllite/xmlelement.h"
+#include "webrtc/libjingle/xmpp/jid.h"
+#include "webrtc/libjingle/xmpp/xmpptask.h"
+
+namespace buzz {
+
+// Base class to help write pubsub tasks.
+// In ProcessStart call SubscribeNode with namespaces of interest along with
+// NodeHandlers.
+// When pubsub notifications arrive and matches the namespace, the NodeHandlers
+// will be called back.
+class PubsubTask : public buzz::XmppTask {
+ public:
+  virtual ~PubsubTask();
+
+ protected:
+  typedef void (PubsubTask::*NodeHandler)(const buzz::XmlElement* node);
+
+  PubsubTask(XmppTaskParentInterface* parent, const buzz::Jid& pubsub_node_jid);
+
+  virtual bool HandleStanza(const buzz::XmlElement* stanza);
+  virtual int ProcessResponse();
+
+  bool SubscribeToNode(const std::string& pubsub_node, NodeHandler handler);
+  void UnsubscribeFromNode(const std::string& pubsub_node);
+
+  // Called when there is an error. Derived class can do what it needs to.
+  virtual void OnPubsubError(const buzz::XmlElement* error_stanza);
+
+ private:
+  typedef std::map<std::string, NodeHandler> NodeSubscriptions;
+
+  void HandlePubsubIqGetResponse(const buzz::XmlElement* pubsub_iq_response);
+  void HandlePubsubEventMessage(const buzz::XmlElement* pubsub_event_message);
+  void HandlePubsubItems(const buzz::XmlElement* items);
+
+  buzz::Jid pubsub_node_jid_;
+  NodeSubscriptions subscribed_nodes_;
+};
+
+}  // namespace buzz
+
+#endif // WEBRTC_LIBJINGLE_XMPP_PUBSUB_TASK_H_