bindings: Throw a TypeError when a given callback function isn't callable

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 6626c4b0f9a4f9f74e6c29001808c980b9ed1740..4fb98497323658d36cdc2683ae515f35fcb0c6da 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
@@ -42,4 +42,16 @@ test(function() {
     assert_equals('4', results[1]);
     assert_equals('9', results[2]);
 }, 'Callback function which takes a number sequence');
+
+test(function() {
+    assert_throws(new TypeError(), function() {
+        callbackFunctionTest.testCallback(null, 'hello', 'world');
+    });
+    assert_throws(new TypeError(), function() {
+        callbackFunctionTest.testCallback({}, 'hello', 'world');
+    });
+    assert_throws(new TypeError(), function() {
+        callbackFunctionTest.testCallback(1, 'hello', 'world');
+    });
+}, 'Passing non-callable values should throw a TypeError');
 </script>