Added ConnectionTimeObserver to calculate the times to authenticate and connect.

remoting/protocol/errors.cc

+// Copyright 2015 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.
+
+#include "remoting/protocol/errors.h"
+
+#define RETURN_STRING_LITERAL(x) \
+case x: \
+return #x;
+
+namespace remoting {
+namespace protocol {
+
+const char* ErrorCodeToString(ErrorCode error) {
+  switch (error) {
+    RETURN_STRING_LITERAL(OK);
+    RETURN_STRING_LITERAL(PEER_IS_OFFLINE);
+    RETURN_STRING_LITERAL(SESSION_REJECTED);
+    RETURN_STRING_LITERAL(INCOMPATIBLE_PROTOCOL);
+    RETURN_STRING_LITERAL(AUTHENTICATION_FAILED);
+    RETURN_STRING_LITERAL(CHANNEL_CONNECTION_ERROR);
+    RETURN_STRING_LITERAL(SIGNALING_ERROR);
+    RETURN_STRING_LITERAL(SIGNALING_TIMEOUT);
+    RETURN_STRING_LITERAL(HOST_OVERLOAD);
+    RETURN_STRING_LITERAL(UNKNOWN_ERROR);
+  }
+  NOTREACHED();
+  return nullptr;
+}
+
+}  // namespace protocol
+}  // namespace remoting