Added ConnectionTimeObserver to calculate the times to authenticate and connect.

remoting/protocol/connection_to_host.h

Index: remoting/protocol/connection_to_host.h
diff --git a/remoting/protocol/connection_to_host.h b/remoting/protocol/connection_to_host.h
index a20bd22605986474c53152c975dc089c8bd99b20..ad9c8bafd30bd30cbc7399ca7ea99014757ad362 100644
--- a/remoting/protocol/connection_to_host.h
+++ b/remoting/protocol/connection_to_host.h
@@ -46,6 +46,9 @@ class ConnectionToHost {
     CLOSED,
   };
 
+  // Returns the literal string of |state|.
+  static const char* StateToString(State state);
+
   class HostEventCallback {
    public:
     virtual ~HostEventCallback() {}