Adding pref to store the user-selected proximity threshold.

components/proximity_auth/proximity_auth_pref_manager_unittest.cc

Index: components/proximity_auth/proximity_auth_pref_manager_unittest.cc
diff --git a/components/proximity_auth/proximity_auth_pref_manager_unittest.cc b/components/proximity_auth/proximity_auth_pref_manager_unittest.cc
index 3ae2072b8356e69d0b2852d4e0cc2e65f4fde585..ba860680ad059646ebb8dc2ccb336631b9c25490 100644
--- a/components/proximity_auth/proximity_auth_pref_manager_unittest.cc
+++ b/components/proximity_auth/proximity_auth_pref_manager_unittest.cc
@@ -27,6 +27,9 @@ const char kPublicKey2[] = "public key 2";
 const int64_t kPasswordEntryTimestampMs1 = 123456789L;
 const int64_t kPasswordEntryTimestampMs2 = 987654321L;
 
+const int kProximityThreshold1 = 2;
+const int kProximityThreshold2 = 3;
+
 }  //  namespace
 
 class ProximityAuthProximityAuthPrefManagerTest : public testing::Test {
@@ -170,4 +173,13 @@ TEST_F(ProximityAuthProximityAuthPrefManagerTest, LastPasswordEntryTimestamp) {
             pref_manager.GetLastPasswordEntryTimestampMs());
 }
 
+TEST_F(ProximityAuthProximityAuthPrefManagerTest, ProximityThreshold) {
+  ProximityAuthPrefManager pref_manager(&pref_service_);
+  EXPECT_EQ(1, pref_manager.GetProximityThreshold());
+  pref_manager.SetProximityThreshold(kProximityThreshold1);
+  EXPECT_EQ(kProximityThreshold1, pref_manager.GetProximityThreshold());
+  pref_manager.SetProximityThreshold(kProximityThreshold2);
+  EXPECT_EQ(kProximityThreshold2, pref_manager.GetProximityThreshold());
+}
+
 }  // namespace proximity_auth