Encoding API: Expose 'fatal' and 'ignoreBOM' readonly attributes

LayoutTests/fast/encoding/api/fatal-flag.html

Index: LayoutTests/fast/encoding/api/fatal-flag.html
diff --git a/LayoutTests/fast/encoding/api/fatal-flag.html b/LayoutTests/fast/encoding/api/fatal-flag.html
index f0a7b76fbd14dbb395df75719ebffa92150f4753..96008917ed5b3a16c7585c91a15e51f9300f8e4a 100644
--- a/LayoutTests/fast/encoding/api/fatal-flag.html
+++ b/LayoutTests/fast/encoding/api/fatal-flag.html
@@ -62,4 +62,12 @@ bad.forEach(function(t) {
     }, 'Fatal flag: ' + t.encoding + ' - ' + t.name);
 });
 
+test(function() {
+    assert_true('fatal' in new TextDecoder(), 'The fatal attribute should exist on TextDecoder.');
+    assert_equals(typeof  new TextDecoder().fatal, 'boolean', 'The type of the fatal attribute should be boolean.');
+    assert_false(new TextDecoder().fatal, 'The fatal attribute should default to false.');
+    assert_true(new TextDecoder('utf-8', {fatal: true}).fatal, 'The fatal attribute can be set using an option.');
+
+}, 'The fatal attribute of TextDecoder');
+
 </script>