Save mConfirmingCredentials state

Fixes: 162486392
Test: Remove all fingerprints/credentials, tap fingerprint settings,
      rotate device when setting credential. Finish credential
      setup and biometric enrollment. Only prompted to set up credential
      once.
Test: 1) Wipe device
      2) Proceed to set up credential in SUW, but pause on first
         credential screen (choose lock)
      3) adb shell cmd uimode night yes // triggers activity recreate
      4) Proceed with credential/biometric setup
      Notice not re-prompted for credentials
Change-Id: I65fc0265acad98b18b152070b85cc4f71693cc68

src/com/android/settings/biometrics/BiometricEnrollIntroduction.java

@@ -43,6 +43,8 @@ import com.google.android.setupdesign.span.LinkSpan;
 public abstract class BiometricEnrollIntroduction extends BiometricEnrollBase
         implements LinkSpan.OnClickListener {
 
+    private static final String KEY_CONFIRMING_CREDENTIALS = "confirming_credentials";
+
     private UserManager mUserManager;
     private boolean mHasPassword;
     private boolean mBiometricUnlockDisabledByAdmin;
@@ -127,6 +129,10 @@ public abstract class BiometricEnrollIntroduction extends BiometricEnrollBase
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
+        if (savedInstanceState != null) {
+            mConfirmingCredentials = savedInstanceState.getBoolean(KEY_CONFIRMING_CREDENTIALS);
+        }
+
         Intent intent = getIntent();
         if (intent.getStringExtra(WizardManagerHelper.EXTRA_THEME) == null) {
             // Put the theme in the intent so it gets propagated to other activities in the flow
@@ -149,6 +155,7 @@ public abstract class BiometricEnrollIntroduction extends BiometricEnrollBase
         mUserManager = UserManager.get(this);
         updatePasswordQuality();
 
+        if (!mConfirmingCredentials) {
             if (!mHasPassword) {
                 // No password registered, launch into enrollment wizard.
                 mConfirmingCredentials = true;
@@ -160,6 +167,7 @@ public abstract class BiometricEnrollIntroduction extends BiometricEnrollBase
                 launchConfirmLock(getConfirmLockTitleResId(), getChallenge());
             }
         }
+    }
 
     @Override
     protected void onResume() {
@@ -178,6 +186,12 @@ public abstract class BiometricEnrollIntroduction extends BiometricEnrollBase
         }
     }
 
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putBoolean(KEY_CONFIRMING_CREDENTIALS, mConfirmingCredentials);
+    }
+
     @Override
     protected boolean shouldFinishWhenBackgrounded() {
         return super.shouldFinishWhenBackgrounded() && !mConfirmingCredentials && !mNextClicked;