Log incoming and outgoing XMPP stanza on the host

Review-Url: https://codereview.chromium.org/2081793003
Cr-Commit-Position: refs/heads/master@{#401490}

remoting/base/logging.h

@@ -15,6 +15,7 @@ namespace remoting {
 // In the future we may also consider writing to a log file instead of the
 // console.
 #define HOST_LOG LOG(INFO)
+#define HOST_DLOG DLOG(INFO)
 
 }  // namespace remoting
 

remoting/signaling/xmpp_signal_strategy.cc

@@ -29,6 +29,7 @@
 #include "net/socket/ssl_client_socket.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "remoting/base/buffered_socket_writer.h"
+#include "remoting/base/logging.h"
 #include "remoting/signaling/xmpp_login_handler.h"
 #include "remoting/signaling/xmpp_stream_parser.h"
 #include "third_party/webrtc/libjingle/xmllite/xmlelement.h"
@@ -248,6 +249,9 @@ bool XmppSignalStrategy::Core::SendStanza(
     return false;
   }
 
+  HOST_DLOG << "Sending outgoing stanza:\n"
+            << stanza->Str()
+            << "\n=========================================================";
   SendMessage(stanza->Str());
 
   // Return false if the SendMessage() call above resulted in the SignalStrategy
@@ -356,6 +360,11 @@ void XmppSignalStrategy::Core::OnStanza(
     const std::unique_ptr<buzz::XmlElement> stanza) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
+
+  HOST_DLOG << "Received incoming stanza:\n"
+            << stanza->Str()
+            << "\n=========================================================";
+
   base::ObserverListBase<Listener>::Iterator it(&listeners_);
   for (Listener* listener = it.GetNext(); listener; listener = it.GetNext()) {
     if (listener->OnSignalStrategyIncomingStanza(stanza.get()))