Adding pref to store the user-selected proximity threshold.

chrome/browser/signin/easy_unlock_service.cc

Index: chrome/browser/signin/easy_unlock_service.cc
diff --git a/chrome/browser/signin/easy_unlock_service.cc b/chrome/browser/signin/easy_unlock_service.cc
index 10a971d307b4763f50cddd259fd06f5174fec997..b344b3000099592498559773a506092d88b0dc2b 100644
--- a/chrome/browser/signin/easy_unlock_service.cc
+++ b/chrome/browser/signin/easy_unlock_service.cc
@@ -263,6 +263,9 @@ void EasyUnlockService::RegisterProfilePrefs(
       prefs::kEasyUnlockProximityRequired,
       false,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
+  registry->RegisterIntegerPref(

[Tim Song, 2017/07/07 21:48:24]

Note: We also need to sync this to the local state in
EasyUnlockServiceRegular::SyncProfilePrefsToLocalState().

[Tim Song, 2017/07/07 21:48:24]

Although there are a lot of prefs here, I want to gradually move all of them to
ProximityAuthPrefManager. There's also a lot of prefs here that are only used by
the Chrome app.

Can you make a RegisterProfilePrefs() function in ProximityAuthPrefManager
instead?

[sacomoto, 2017/07/10 16:54:07]

I moved it to ProximityAuthPrefManager. There is already a
ProximityAuthPrefManager::RegisterPrefs(), which we are calling below.

However, I kept the definition of prefs::kEasyUnlockProximityThreshold in the
chrome/common/pref_names.h, because I need to whitelist them here:
webui/settings/md_settings_localized_strings_provider.cc.

[sacomoto, 2017/07/10 16:54:07]

Done.

+      prefs::kEasyUnlockProximityThreshold, 1,
+      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           proximity_auth::switches::kEnableBluetoothLowEnergyDiscovery))