Automatically generate most constructors

client/dom/generated/src/frog/_TextTrackCueFactoryProvider.dart

Index: client/dom/generated/src/frog/_TextTrackCueFactoryProvider.dart
diff --git a/client/dom/generated/src/frog/_TextTrackCueFactoryProvider.dart b/client/dom/generated/src/frog/_TextTrackCueFactoryProvider.dart
new file mode 100644
index 0000000000000000000000000000000000000000..6ce7ee976ff8fb1a1cebbda77f100840bb3eb74e
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+++ b/client/dom/generated/src/frog/_TextTrackCueFactoryProvider.dart
@@ -0,0 +1,15 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+class _TextTrackCueFactoryProvider {
+  factory TextTrackCue(String id, num startTime, num endTime, String text,
+                       [String settings, bool pauseOnExit]) native
+'''
+if (settings == null)
+  return new TextTrackCue(id, startTime, endTime, text);
+if (pauseOnExit == null)
+  return new TextTrackCue(id, startTime, endTime, text, settings);
+return new TextTrackCue(id, startTime, endTime, text, settings, pauseOnExit);
+''';
+}