Tether: record each type of host connection result.

chromeos/components/tether/mock_host_connection_metrics_logger.cc

Index: chromeos/components/tether/mock_host_connection_metrics_logger.cc
diff --git a/chromeos/components/tether/mock_host_connection_metrics_logger.cc b/chromeos/components/tether/mock_host_connection_metrics_logger.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d46cc4a85009fc42ac7e6e4df4395ec9640b4130
--- /dev/null
+++ b/chromeos/components/tether/mock_host_connection_metrics_logger.cc
@@ -0,0 +1,17 @@
+// Copyright 2017 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 "chromeos/components/tether/mock_host_connection_metrics_logger.h"
+
+namespace chromeos {
+
+namespace tether {
+
+MockHostConnectionMetricsLogger::MockHostConnectionMetricsLogger() {}
+
+MockHostConnectionMetricsLogger::~MockHostConnectionMetricsLogger() {}
+
+}  // namespace tether
+
+}  // namespace chromeos