[Chromoting] Plugin message in JingleMessage

remoting/protocol/jingle_messages.cc

Index: remoting/protocol/jingle_messages.cc
diff --git a/remoting/protocol/jingle_messages.cc b/remoting/protocol/jingle_messages.cc
index 8c8c1640bfd0cf223720c7b8c84a6c8c4a81331b..85b13b4478d6ad47791cf75b648c39e7833fe41b 100644
--- a/remoting/protocol/jingle_messages.cc
+++ b/remoting/protocol/jingle_messages.cc
@@ -342,10 +342,23 @@ bool JingleMessage::ParseXml(const buzz::XmlElement* stanza,
     return false;
   }
 
+  const XmlElement* plugin_tag =
+      jingle_tag->FirstNamed(QName(kChromotingXmlNamespace, "plugin"));
+  if (plugin_tag) {
+    plugin_message.reset(new XmlElement(*plugin_tag));
+  } else {
+    plugin_message.reset(nullptr);
+  }
+
   if (action == SESSION_INFO) {
     // session-info messages may contain arbitrary information not
     // defined by the Jingle protocol. We don't need to parse it.
     const XmlElement* child = jingle_tag->FirstElement();
+    // Plugin messages are action independent, which should not be considered as
+    // session-info.
+    if (child == plugin_tag) {
+      child = child->NextElement();
+    }
     if (child) {
       // session-info is allowed to be empty.
       info.reset(new XmlElement(*child));
@@ -443,6 +456,10 @@ std::unique_ptr<buzz::XmlElement> JingleMessage::ToXml() const {
     LOG(FATAL) << "Invalid action value " << action;
   jingle_tag->AddAttr(QName(kEmptyNamespace, "action"), action_attr);
 
+  if (plugin_message) {
+    jingle_tag->AddElement(new XmlElement(*plugin_message));
+  }
+
   if (action == SESSION_INFO) {
     if (info.get())
       jingle_tag->AddElement(new XmlElement(*info.get()));