Clear "Wrong pattern" prompt automatically.

When the user enters a wrong pattern/pin/password, a "Wrong
pattern/pin/password" text shows up on ConfirmLockPattern or
ConfirmLockPassword screen. In ConfirmLockPassword, it disappears
automatically after 3 seconds, whereas it doesn't in ConfirmLockPattern.

In this change, we make the prompt in ConfirmLockPattern disappear
automatically as well.

Bug: 64781905
Test: manual
Test: make RunSettingsRoboTests
Change-Id: I53a25576413671ced4197064d51fbcc397733265

src/com/android/settings/password/ConfirmDeviceCredentialBaseFragment.java

@@ -77,6 +77,9 @@ public abstract class ConfirmDeviceCredentialBaseFragment extends OptionsMenuFra
     protected static final int USER_TYPE_MANAGED_PROFILE = 2;
     protected static final int USER_TYPE_SECONDARY = 3;
 
+    /** Time we wait before clearing a wrong input attempt (e.g. pattern) and the error message. */
+    protected static final long CLEAR_WRONG_ATTEMPT_TIMEOUT_MS = 3000;
+
     private FingerprintUiHelper mFingerprintHelper;
     protected boolean mReturnCredentials = false;
     protected Button mCancelButton;