bindings: Support sequence in callback function arguments

third_party/WebKit/LayoutTests/fast/dom/idl-callback-function-unittest.html

Index: third_party/WebKit/LayoutTests/fast/dom/idl-callback-function-unittest.html
diff --git a/third_party/WebKit/LayoutTests/fast/dom/idl-callback-function-unittest.html b/third_party/WebKit/LayoutTests/fast/dom/idl-callback-function-unittest.html
index e9d93711fda441b6e539cac54b53081dd0fcd0d2..6626c4b0f9a4f9f74e6c29001808c980b9ed1740 100644
--- a/third_party/WebKit/LayoutTests/fast/dom/idl-callback-function-unittest.html
+++ b/third_party/WebKit/LayoutTests/fast/dom/idl-callback-function-unittest.html
@@ -31,4 +31,15 @@ test(function() {
     };
     callbackFunctionTest.testReceiverObjectCallback(callback);
 }, 'Callback function which takes receiver object');
+
+test(function() {
+    var squareStringNumbers = function(numbers) {
+        return numbers.map(n => (n * n).toString());
+    };
+    var results = callbackFunctionTest.testSequenceCallback(squareStringNumbers, [1, 2, 3]);
+    assert_equals(3, results.length);
+    assert_equals('1', results[0]);
+    assert_equals('4', results[1]);
+    assert_equals('9', results[2]);
+}, 'Callback function which takes a number sequence');
 </script>