imports: allow dirPackageInfo to be overridden

Change-Id: Ie90d2681e364e2a3f905675db266cb8960e08277
Reviewed-on: https://go-review.googlesource.com/39995
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed