Added ConnectionTimeObserver to calculate the times to authenticate and connect.

remoting/protocol/errors.h

Index: remoting/protocol/errors.h
diff --git a/remoting/protocol/errors.h b/remoting/protocol/errors.h
index 7f4daf64031c6b8d4341c24da623b72bef84894a..397b9b158dcdd73bc326f1ad2d0d06486157adc8 100644
--- a/remoting/protocol/errors.h
+++ b/remoting/protocol/errors.h
@@ -5,6 +5,8 @@
 #ifndef REMOTING_PROTOCOL_ERROR_H_
 #define REMOTING_PROTOCOL_ERROR_H_
 
+#include "base/logging.h"
+
 namespace remoting {
 namespace protocol {
 
@@ -25,6 +27,9 @@ enum ErrorCode {
   UNKNOWN_ERROR,
 };
 
+// Returns the literal string of |error|.
+const char* ErrorCodeToString(ErrorCode error);
+
 }  // namespace protocol
 }  // namespace remoting