Fix missing observer reply callbacks

This was causing upto 2 seconds in user switching delay.

Bug: 25813588
Change-Id: Icf23b021f134a8ccfa2dae470af02b2da7454acc

packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarPolicy.java

@@ -383,6 +383,12 @@ public class PhoneStatusBarPolicy implements Callback {
                 @Override
                 public void onUserSwitching(int newUserId, IRemoteCallback reply) {
                     mUserInfoController.reloadUserInfo();
+                    if (reply != null) {
+                        try {
+                            reply.sendResult(null);
+                        } catch (RemoteException e) {
+                        }
+                    }
                 }
 
                 @Override

services/core/java/com/android/server/fingerprint/FingerprintService.java

@@ -1139,6 +1139,12 @@ public class FingerprintService extends SystemService implements IBinder.DeathRe
                     public void onUserSwitching(int newUserId, IRemoteCallback reply) {
                         mHandler.obtainMessage(MSG_USER_SWITCHING, newUserId, 0 /* unused */)
                                 .sendToTarget();
+                        if (reply != null) {
+                            try {
+                                reply.sendResult(null);
+                            } catch (RemoteException e) {
+                            }
+                        }
                     }
                     @Override
                     public void onUserSwitchComplete(int newUserId) throws RemoteException {