8338488: Add screen capture for failure case

Reviewed-by: azvegint

test/jdk/java/awt/Checkbox/CheckboxCheckerScalingTest.java

@@ -29,6 +29,10 @@ import java.awt.Point;
 import java.awt.Rectangle;
 import java.awt.Robot;
 import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+
+import javax.imageio.ImageIO;
 
 /*
  * @test
@@ -78,6 +82,12 @@ public class CheckboxCheckerScalingTest {
             });
 
             if (!checkmarkFound) {
+                try {
+                    ImageIO.write(imageAfterChecked, "png",
+                            new File("imageAfterChecked.png"));
+                } catch (IOException e) {
+                    throw new RuntimeException(e);
+                }
                 throw new RuntimeException("Checkmark not scaled");
             }
             System.out.println("Test Passed");