[Proximity Auth] Port the UnlockManager class.

components/proximity_auth/metrics.cc

Index: components/proximity_auth/metrics.cc
diff --git a/components/proximity_auth/metrics.cc b/components/proximity_auth/metrics.cc
index 99f74b13e2abf24b8d448007189da5adc7ddfdf6..7b4db8f42bdda59b77274213646920881cf00cf9 100644
--- a/components/proximity_auth/metrics.cc
+++ b/components/proximity_auth/metrics.cc
@@ -4,6 +4,7 @@
 
 #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"
@@ -69,5 +70,12 @@ void RecordAuthProximityRemoteDeviceModelHash(const std::string& device_model) {
                               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