Adding pref to store the user-selected proximity threshold.

components/proximity_auth/proximity_auth_pref_manager.cc

Index: components/proximity_auth/proximity_auth_pref_manager.cc
diff --git a/components/proximity_auth/proximity_auth_pref_manager.cc b/components/proximity_auth/proximity_auth_pref_manager.cc
index c8c637c0cf2b8869ce7a8c40e334d6f952b7801a..f5c21ac3bf1f6af14881ee0bc29a3d9025f8b189 100644
--- a/components/proximity_auth/proximity_auth_pref_manager.cc
+++ b/components/proximity_auth/proximity_auth_pref_manager.cc
@@ -9,6 +9,8 @@
 
 #include "base/macros.h"
 #include "base/values.h"
+#include "chrome/common/pref_names.h"
+#include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 #include "components/prefs/scoped_user_pref_update.h"
@@ -27,6 +29,9 @@ void ProximityAuthPrefManager::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterInt64Pref(prefs::kProximityAuthLastPasswordEntryTimestampMs,
                               0L);
   registry->RegisterDictionaryPref(prefs::kProximityAuthRemoteBleDevices);
+  registry->RegisterIntegerPref(
+      ::prefs::kEasyUnlockProximityThreshold, 1,
+      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 }
 
 bool ProximityAuthPrefManager::HasDeviceWithAddress(
@@ -121,4 +126,12 @@ const base::DictionaryValue* ProximityAuthPrefManager::GetRemoteBleDevices()
   return pref_service_->GetDictionary(prefs::kProximityAuthRemoteBleDevices);
 }
 
+void ProximityAuthPrefManager::SetProximityThreshold(int value) {
+  pref_service_->SetInteger(::prefs::kEasyUnlockProximityThreshold, value);
+}
+
+int ProximityAuthPrefManager::GetProximityThreshold() const {
+  return pref_service_->GetInteger(::prefs::kEasyUnlockProximityThreshold);
+}
+
 }  // namespace proximity_auth