Add dependencies support to adhoc tests.

This is to suppor calling xcode binaries from within adhoc tests.

Change-Id: I1cd4df80024c0c1834985289ebcff8e1d666ddc5
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/6840
Reviewed-by: Christopher Fujino <fujino@google.com>
Commit-Queue: Godofredo Contreras <godofredoc@google.com>