CL 99316 moved generation of bindings from the the gomobile command
to the gobind command. In the process, the ability to copy over
documentation from the Go source to the derived Java and ObjC was
lost. The relevant test didn't fail because it tests the generator
itself, not gobind.
Re-add support and add a gobind test for it.
Fixesgolang/go#25473
Change-Id: I6eee3e79173f37d3e3e65eabc0bad59e4252da64
Reviewed-on: https://go-review.googlesource.com/114056
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
002e3c5c61