Fixed problem where Face Unlock area was showing

I introduced a bug cl https://android-git.corp.google.com/g/#/c/141926
that caused black box to hide lock pattern even when not using Face
Unlock.

Fixed by adding the corresponding check to make sure Face Unlock is
being used.

Change-Id: I9c429c99d7db4d1ab831080f23a1e10123dbfe3e

Author: Brian Colonna

policy/src/com/android/internal/policy/impl/LockPatternKeyguardView.java

@@ -334,7 +334,10 @@ public void takeEmergencyCallAction() {
                 stopAndUnbindFromFaceLock();
 
                 // Continue showing FaceLock area until dialer comes up
-                showFaceLockAreaWithTimeout(FACELOCK_VIEW_AREA_EMERGENCY_DIALER_TIMEOUT);
+                if (mLockPatternUtils.usingBiometricWeak() &&
+                        mLockPatternUtils.isBiometricWeakInstalled()) {
+                    showFaceLockAreaWithTimeout(FACELOCK_VIEW_AREA_EMERGENCY_DIALER_TIMEOUT);
+                }
 
                 pokeWakelock(EMERGENCY_CALL_TIMEOUT);
                 if (TelephonyManager.getDefault().getCallState()
@@ -535,7 +538,10 @@ private void activateFaceLockIfAble() {
             bindToFaceLock();
             // Show FaceLock area, but only for a little bit so lockpattern will become visible if
             // FaceLock fails to start or crashes
-            showFaceLockAreaWithTimeout(FACELOCK_VIEW_AREA_SERVICE_TIMEOUT);
+            if (mLockPatternUtils.usingBiometricWeak() &&
+                    mLockPatternUtils.isBiometricWeakInstalled()) {
+                showFaceLockAreaWithTimeout(FACELOCK_VIEW_AREA_SERVICE_TIMEOUT);
+            }
         } else {
             hideFaceLockArea();
         }