Add a loading progress timeout mechanism to Internet Settings

- The WiFi scan results may not be called back, need to add loading
progress timeout to avoid loading forever

Bug: 191336310
Test: manual test
make RunSettingsRoboTests ROBOTEST_FILTER=NetworkProviderSettingsTest

Change-Id: I71071e7e68007cf7e16be46230eec3b01f4d2b45

src/com/android/settings/network/NetworkProviderSettings.java

@@ -267,9 +267,8 @@ public class NetworkProviderSettings extends RestrictedSettingsFragment
         if (mWifiManager != null) {
             setLoading(true, false);
             mIsViewLoading = true;
-            if (!mWifiManager.isWifiEnabled()) {
+            getView().postDelayed(mRemoveLoadingRunnable,
-                getView().postDelayed(mRemoveLoadingRunnable, 100);
+                    mWifiManager.isWifiEnabled() ? 1000 : 100);
-            }
         }
     }