[Proximity Auth] Port the UnlockManager class.

components/proximity_auth/metrics.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 "components/proximity_auth/metrics.h"
 
+#include "base/logging.h"
 #include "base/md5.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/sys_byteorder.h"
 
 namespace proximity_auth {
 namespace metrics {
 
 namespace {
 
@@ skipping 45 matching lines @@
     base::TimeDelta time_since_last_zero_rssi) {
   UMA_HISTOGRAM_TIMES("EasyUnlock.AuthProximity.TimeSinceLastZeroRssi",
                       time_since_last_zero_rssi);
 }
 
 void RecordAuthProximityRemoteDeviceModelHash(const std::string& device_model) {
   UMA_HISTOGRAM_SPARSE_SLOWLY("EasyUnlock.AuthProximity.RemoteDeviceModelHash",
                               HashDeviceModelName(device_model));
 }
 
+void RecordRemoteSecuritySettingsState(RemoteSecuritySettingsState state) {
+  DCHECK(state < RemoteSecuritySettingsState::COUNT);
+  UMA_HISTOGRAM_ENUMERATION(
+      "EasyUnlock.RemoteLockScreenState", static_cast<int>(state),
+      static_cast<int>(RemoteSecuritySettingsState::COUNT));
+}
+
 }  // namespace metrics
 }  // namespace proximity_auth