Validate userId when publishing shortcuts

Bug: 288110451
Test: manual
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:01bfd04ff445db6290ae430d44ea1bf1a115fe3c)
Merged-In: Idbde676f871db83825155730e3714f3727e25762
Change-Id: Idbde676f871db83825155730e3714f3727e25762
1 file changed