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..910c110527f4c828b9df6d516d6b0d0fb95bfc17 100644
--- a/chrome/browser/signin/easy_unlock_service_regular.cc
+++ b/chrome/browser/signin/easy_unlock_service_regular.cc
@@ -450,6 +450,9 @@ void EasyUnlockServiceRegular::InitializeInternal() {
   registrar_.Add(prefs::kEasyUnlockProximityRequired,
                  base::Bind(&EasyUnlockServiceRegular::OnPrefsChanged,
                             base::Unretained(this)));
+  registrar_.Add(prefs::kEasyUnlockProximityThreshold,
+                 base::Bind(&EasyUnlockServiceRegular::OnPrefsChanged,
+                            base::Unretained(this)));
 
   OnPrefsChanged();
 
@@ -614,6 +617,9 @@ void EasyUnlockServiceRegular::SyncProfilePrefsToLocalState() {
   user_prefs_dict->SetBooleanWithoutPathExpansion(
       prefs::kEasyUnlockProximityRequired,
       profile_prefs->GetBoolean(prefs::kEasyUnlockProximityRequired));
+  user_prefs_dict->SetIntegerWithoutPathExpansion(
+      prefs::kEasyUnlockProximityThreshold,
+      profile_prefs->GetInteger(prefs::kEasyUnlockProximityThreshold));
 
   DictionaryPrefUpdate update(local_state,
                               prefs::kEasyUnlockLocalStateUserPrefs);