8269026: PasswordField doesn't render bullet character on Android

Reviewed-by: kcr

modules/javafx.controls/src/android/java/javafx/scene/control/skin/TextFieldSkinAndroid.java

@@ -28,6 +28,7 @@
 import javafx.beans.value.ChangeListener;
 import javafx.beans.value.WeakChangeListener;
 import javafx.event.EventHandler;
+import javafx.scene.control.PasswordField;
 import javafx.scene.control.TextField;
 import javafx.scene.input.MouseEvent;
 
@@ -39,6 +40,8 @@ public class TextFieldSkinAndroid extends TextFieldSkin {
      *
      **************************************************************************/
 
+    private static final char BULLET = '\u2022';
+
     private final EventHandler<MouseEvent> mouseEventListener = e -> {
         if (getSkinnable().isEditable() && getSkinnable().isFocused()) {
             showSoftwareKeyboard();
@@ -71,6 +74,15 @@ public TextFieldSkinAndroid(final TextField textField) {
      *                                                                         *
      **************************************************************************/
 
+    /** {@inheritDoc} */
+    @Override protected String maskText(String txt) {
+        if (getSkinnable() instanceof PasswordField) {
+            return String.valueOf(BULLET).repeat(txt.length());
+        } else {
+            return super.maskText(txt);
+        }
+    }
+
     /** {@inheritDoc} */
     @Override public void dispose() {
         if (getSkinnable() == null) return;