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 f8ff7e029adb70b8f7eb085f008685e54ccfdf7b..5833a52b0e29f4303cdba7b5c7596ad26e0e5f81 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
@@ -2,8 +2,9 @@
 <script src="../../resources/testharness.js"></script>
 <script src="../../resources/testharnessreport.js"></script>
 <script>
+var callbackFunctionTest = internals.callbackFunctionTest();
+
 test(function() {
-    var callbackFunctionTest = internals.callbackFunctionTest();
     var callback1 = function(msg1, msg2) {
         return msg1 + ', ' + msg2;
     };
@@ -14,4 +15,15 @@ test(function() {
     };
     assert_equals(callbackFunctionTest.testCallback(callback2, 'hello', 'world'), 'SUCCESS: hellohello worldworld');
 }, 'Callback function which takes two strings');
+
+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>