Added HostKeyPair class, signatures for heartbeat messages.

remoting/jingle_glue/jingle_channel.cc

Index: remoting/jingle_glue/jingle_channel.cc
diff --git a/remoting/jingle_glue/jingle_channel.cc b/remoting/jingle_glue/jingle_channel.cc
index 77fcd1b14a6f28496b1ed4f913fa6783b54cb1fc..0ff634c383f16dec3e011bf94c3016e169a2b9fb 100644
--- a/remoting/jingle_glue/jingle_channel.cc
+++ b/remoting/jingle_glue/jingle_channel.cc
@@ -45,6 +45,7 @@ void JingleChannel::Init(JingleThread* thread,
   thread_ = thread;
   stream_.reset(stream);
   stream_->SignalEvent.connect(&event_handler_, &EventHandler::OnStreamEvent);
+  jid_ = jid;
 
   // Initialize |state_|.
   switch (stream->GetState()) {
@@ -63,8 +64,6 @@ void JingleChannel::Init(JingleThread* thread,
     default:
       NOTREACHED();
   }
-
-  jid_ = jid;
 }
 
 void JingleChannel::Write(scoped_refptr<DataBuffer> data) {