Add TypeChecking=Unrestricted to Web Animation APIs

LayoutTests/web-animations-api/player.html

Index: LayoutTests/web-animations-api/player.html
diff --git a/LayoutTests/web-animations-api/player.html b/LayoutTests/web-animations-api/player.html
index 59803ef35e8f6a11050fff42e54176de04d2caa0..ce94dd659855e1a19ff4b5aa0eead490b72bc37d 100644
--- a/LayoutTests/web-animations-api/player.html
+++ b/LayoutTests/web-animations-api/player.html
@@ -42,4 +42,12 @@ test(function() {
     var player = element.animate([{left: '0px', offset: 0}, {left: '100px', offset: 1}], {iterations: Infinity, duration: 10});
     assert_throws('INVALID_STATE_ERR', function() { player.finish(); });
 }, 'Player.finish() raises exception if source content end is infinity');
+
+test(function() {
+    var player = element.animate([{left: '0px', offset: 0}, {left: '100px', offset: 1}], 10000);
+    for (var attr of ['startTime', 'currentTime', 'playbackRate']) {
+        assert_throws(new TypeError, function() { player[attr] = NaN; }, attr);
+        assert_throws(new TypeError, function() { player[attr] = Infinity; }, attr);
+    }
+}, 'Player.startTime/currentTime/playbackRate throw if passed non-finite numbers.');
 </script>