Validate URI-based shortcut icon at creation time.

Bug: 288113797
Test: manual
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:3d41fb7620ffb9c81b23977c8367c323e4721e65)
Merged-In: I392f8e923923bf40827a2b6207c4eaa262694fbc
Change-Id: I392f8e923923bf40827a2b6207c4eaa262694fbc
1 file changed