Added HostKeyPair class, signatures for heartbeat messages.

remoting/jingle_glue/iq_request.h

Index: remoting/jingle_glue/iq_request.h
diff --git a/remoting/jingle_glue/iq_request.h b/remoting/jingle_glue/iq_request.h
index 9d6dcad0aea3aff2cb39462cb74e6b239d6e3cf8..6933b17b8cec1df6e7948020ad2a3ab17249849e 100644
--- a/remoting/jingle_glue/iq_request.h
+++ b/remoting/jingle_glue/iq_request.h
@@ -21,7 +21,6 @@ class JingleClient;
 // set_callback(). If multiple IQ stanzas are send with SendIq() then only reply
 // to the last one will be received.
 // The class must be used on the jingle thread only.
-// TODO(sergeyu): Implement unittests for this class.
 class IqRequest : private buzz::XmppIqHandler {
  public:
   typedef Callback1<const buzz::XmlElement*>::Type ReplyCallback;
@@ -32,8 +31,8 @@ class IqRequest : private buzz::XmppIqHandler {
   // Sends stanza of type |type| to |addressee|. |iq_body| contains body of
   // the stanza. Ownership of |iq_body| is transfered to IqRequest. Must
   // be called on the jingle thread.
-  void SendIq(const std::string& type, const std::string& addressee,
-              buzz::XmlElement* iq_body);
+  virtual void SendIq(const std::string& type, const std::string& addressee,
+                      buzz::XmlElement* iq_body);
 
   // Sets callback that is called when reply stanza is received. Callback
   // is called on the jingle thread.