Added ConnectionTimeObserver to calculate the times to authenticate and connect.

remoting/protocol/errors.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_PROTOCOL_ERROR_H_
 #define REMOTING_PROTOCOL_ERROR_H_
 
 namespace remoting {
 namespace protocol {
 
 // The UI implementations maintain corresponding definitions of this
 // enumeration in webapp/error.js and
 // android/java/src/org/chromium/chromoting/jni/JniInterface.java.
 // Be sure to update these locations if you make any changes to the ordering.
 enum ErrorCode {
   OK = 0,
   PEER_IS_OFFLINE,
   SESSION_REJECTED,
   INCOMPATIBLE_PROTOCOL,
   AUTHENTICATION_FAILED,
   CHANNEL_CONNECTION_ERROR,
   SIGNALING_ERROR,
   SIGNALING_TIMEOUT,
   HOST_OVERLOAD,
   UNKNOWN_ERROR,
 };
 
+// Returns the literal string of |error|.
+const char* ErrorCodeToString(ErrorCode error);
+
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_ERROR_H_