Log incoming and outgoing XMPP stanza on the host

Review-Url: https://codereview.chromium.org/2081793003
Cr-Commit-Position: refs/heads/master@{#401490}
diff --git a/remoting/base/logging.h b/remoting/base/logging.h
index 77f618c1..4750756 100644
--- a/remoting/base/logging.h
+++ b/remoting/base/logging.h
@@ -15,6 +15,7 @@
 // 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