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

LayoutTests/fast/encoding/api/textdecoder-ignorebom.html

Index: LayoutTests/fast/encoding/api/textdecoder-ignorebom.html
diff --git a/LayoutTests/fast/encoding/api/textdecoder-ignorebom.html b/LayoutTests/fast/encoding/api/textdecoder-ignorebom.html
index 80be41e88d9ed890796c188846b5b5dee627ec46..6770b532cea51d6fad6e91031e260939e41162b1 100644
--- a/LayoutTests/fast/encoding/api/textdecoder-ignorebom.html
+++ b/LayoutTests/fast/encoding/api/textdecoder-ignorebom.html
@@ -34,4 +34,12 @@ cases.forEach(function(testCase) {
     }, 'BOM is ignored if ignoreBOM option is specified: ' + testCase.encoding);
 });
 
+test(function() {
+    assert_true('ignoreBOM' in new TextDecoder(), 'The ignoreBOM attribute should exist on TextDecoder.');
+    assert_equals(typeof  new TextDecoder().ignoreBOM, 'boolean', 'The type of the ignoreBOM attribute should be boolean.');
+    assert_false(new TextDecoder().ignoreBOM, 'The ignoreBOM attribute should default to false.');
+    assert_true(new TextDecoder('utf-8', {ignoreBOM: true}).ignoreBOM, 'The ignoreBOM attribute can be set using an option.');
+
+}, 'The ignoreBOM attribute of TextDecoder');
+
 </script>