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

webrtc/libjingle/xmpp/presencestatus.cc

+/*
+ *  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.
+ */
+
+#include "webrtc/libjingle/xmpp/presencestatus.h"
+
+namespace buzz {
+PresenceStatus::PresenceStatus()
+  : pri_(0),
+    show_(SHOW_NONE),
+    available_(false),
+    e_code_(0),
+    feedback_probation_(false),
+    know_capabilities_(false),
+    voice_capability_(false),
+    pmuc_capability_(false),
+    video_capability_(false),
+    camera_capability_(false) {
+}
+
+void PresenceStatus::UpdateWith(const PresenceStatus& new_value) {
+  if (!new_value.know_capabilities()) {
+    bool k = know_capabilities();
+    bool p = voice_capability();
+    std::string node = caps_node();
+    std::string v = version();
+
+    *this = new_value;
+
+    set_know_capabilities(k);
+    set_caps_node(node);
+    set_voice_capability(p);
+     set_version(v);
+  } else {
+    *this = new_value;
+  }
+}
+
+} // namespace buzz