Adding pref to store the user-selected proximity threshold.

chrome/browser/signin/easy_unlock_service_regular.cc

Index: chrome/browser/signin/easy_unlock_service_regular.cc
diff --git a/chrome/browser/signin/easy_unlock_service_regular.cc b/chrome/browser/signin/easy_unlock_service_regular.cc
index 0c3dabced7b05dab7dabee8dbe503073b1e82ab2..4b5ac1a4246f8babf14ee389da032f984dacc8c1 100644
--- a/chrome/browser/signin/easy_unlock_service_regular.cc
+++ b/chrome/browser/signin/easy_unlock_service_regular.cc
@@ -41,6 +41,7 @@
 #include "components/prefs/scoped_user_pref_update.h"
 #include "components/proximity_auth/logging/logging.h"
 #include "components/proximity_auth/proximity_auth_pref_manager.h"
+#include "components/proximity_auth/proximity_auth_pref_names.h"
 #include "components/proximity_auth/proximity_auth_system.h"
 #include "components/proximity_auth/screenlock_bridge.h"
 #include "components/proximity_auth/switches.h"
@@ -450,6 +451,9 @@ void EasyUnlockServiceRegular::InitializeInternal() {
   registrar_.Add(prefs::kEasyUnlockProximityRequired,
                  base::Bind(&EasyUnlockServiceRegular::OnPrefsChanged,
                             base::Unretained(this)));
+  registrar_.Add(proximity_auth::prefs::kEasyUnlockProximityThreshold,
+                 base::Bind(&EasyUnlockServiceRegular::OnPrefsChanged,
+                            base::Unretained(this)));
 
   OnPrefsChanged();
 
@@ -614,6 +618,10 @@ void EasyUnlockServiceRegular::SyncProfilePrefsToLocalState() {
   user_prefs_dict->SetBooleanWithoutPathExpansion(
       prefs::kEasyUnlockProximityRequired,
       profile_prefs->GetBoolean(prefs::kEasyUnlockProximityRequired));
+  user_prefs_dict->SetIntegerWithoutPathExpansion(
+      proximity_auth::prefs::kEasyUnlockProximityThreshold,
+      profile_prefs->GetInteger(
+          proximity_auth::prefs::kEasyUnlockProximityThreshold));
 
   DictionaryPrefUpdate update(local_state,
                               prefs::kEasyUnlockLocalStateUserPrefs);