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

From private conversation with annevk - make the properties of the
TextDecoder object inspectable.

BUG=375847

Review URL: https://codereview.chromium.org/292243003

git-svn-id: svn://svn.chromium.org/blink/trunk@174977 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/fast/encoding/api/fatal-flag-expected.txt

@@ -33,5 +33,6 @@ PASS Fatal flag: utf-8 - lead surrogate
 PASS Fatal flag: utf-8 - trail surrogate 
 PASS Fatal flag: utf-8 - surrogate pair 
 PASS Fatal flag: utf-16le - truncated code unit 
+PASS The fatal attribute of TextDecoder 
 Harness: the test ran to completion.
 

third_party/WebKit/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>

third_party/WebKit/LayoutTests/fast/encoding/api/textdecoder-ignorebom-expected.txt

@@ -2,5 +2,6 @@ This is a testharness.js-based test.
 PASS BOM is ignored if ignoreBOM option is specified: utf-8 
 PASS BOM is ignored if ignoreBOM option is specified: utf-16le 
 PASS BOM is ignored if ignoreBOM option is specified: utf-16be 
+PASS The ignoreBOM attribute of TextDecoder 
 Harness: the test ran to completion.
 

third_party/WebKit/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>

third_party/WebKit/Source/modules/encoding/TextDecoder.h

@@ -50,6 +50,8 @@ public:
 
     // Implement the IDL
     String encoding() const;
+    bool fatal() const { return m_fatal; }
+    bool ignoreBOM() const { return m_ignoreBOM; }
     String decode(ArrayBufferView*, const Dictionary&, ExceptionState&);
     String decode(ExceptionState& exceptionState) { return decode(0, Dictionary(), exceptionState); }
 

third_party/WebKit/Source/modules/encoding/TextDecoder.idl

@@ -37,5 +37,7 @@
     MeasureAs=TextDecoderConstructor
 ] interface TextDecoder {
     readonly attribute DOMString encoding;
+    readonly attribute boolean fatal;
+    readonly attribute boolean ignoreBOM;
     [RaisesException, MeasureAs=TextDecoderDecode] DOMString decode(optional ArrayBufferView input, optional Dictionary options);
 };