Adding pref to store the user-selected proximity threshold.

components/proximity_auth/proximity_auth_pref_manager.h

Index: components/proximity_auth/proximity_auth_pref_manager.h
diff --git a/components/proximity_auth/proximity_auth_pref_manager.h b/components/proximity_auth/proximity_auth_pref_manager.h
index 9f74191417fc2f6efe8823ad2e81f4e26085ead1..37669276f880f4ac7411be2aca4b1ed785f366b7 100644
--- a/components/proximity_auth/proximity_auth_pref_manager.h
+++ b/components/proximity_auth/proximity_auth_pref_manager.h
@@ -65,6 +65,14 @@ class ProximityAuthPrefManager {
   virtual void SetLastPasswordEntryTimestampMs(int64_t timestamp_ms);
   virtual int64_t GetLastPasswordEntryTimestampMs() const;
 
+  // Setter and getter for the proximity threshold. This preference is
+  // exposed to the user, allowing him / her to change how close the
+  // phone must for the unlock to be allowed.
+  // Note: These are arbitrary values, the actual mapping is done in the
+  // ProximityMonitorImpl.
+  virtual void SetProximityThreshold(int value);

[Tim Song, 2017/07/10 19:27:56]

This |value| should be an enum.

[sacomoto, 2017/07/11 09:56:06]

Done.

+  virtual int GetProximityThreshold() const;
+
  private:
   const base::DictionaryValue* GetRemoteBleDevices() const;