Rewrite LogDog log viewer app.

web/inc/luci-sleep-promise/promise.ts

Index: web/inc/luci-sleep-promise/promise.ts
diff --git a/web/inc/luci-sleep-promise/promise.ts b/web/inc/luci-sleep-promise/promise.ts
new file mode 100644
index 0000000000000000000000000000000000000000..a8221c42ee1f1923cb2c08dcecfd172ad87a8f80
--- /dev/null
+++ b/web/inc/luci-sleep-promise/promise.ts
@@ -0,0 +1,11 @@
+/*
+  Copyright 2016 The LUCI Authors. All rights reserved.
+  Use of this source code is governed under the Apache License, Version 2.0
+  that can be found in the LICENSE file.
+*/
+
+export function sleep(delay: number): Promise<void> {
+  return new Promise<void>( (resolve, reject) => {
+    window.setTimeout(resolve, delay);
+  });
+}