Update fingerprint enroll UI to spec.

Also adds sliding animations between the steps.

Bug: 20495507
Change-Id: I148d8d8b8082361149f02fd2dc4cead0ba3e2526

src/com/android/settings/ConfirmDeviceCredentialBaseFragment.java

@@ -17,13 +17,14 @@
 package com.android.settings;
 
 import android.annotation.Nullable;
-import android.app.Fragment;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;
 import android.widget.ImageView;
 import android.widget.TextView;
 
+import com.android.settings.fingerprint.FingerprintUiHelper;
+
 /**
  * Base fragment to be shared for PIN/Pattern/Password confirmation fragments.
  */