app: fix shiny build.
app: fix shiny build.

Fixes golang/go#14401.

Change-Id: Id8bbc69e8dcb397094c165e97946d4d2688f34ad
Reviewed-on: https://go-review.googlesource.com/19872
Reviewed-by: David Crawshaw <a2f0bf29257797dd66800b4fbb9945c3e216c004@golang.org>

golang/mobile,golang/mobile,golang/mobile,golang/mobile