add upm->upm helper

Change-Id: I912e58339b3b84be17d6a98d52cbc11f376c9a89
Reviewed-on: https://skia-review.googlesource.com/132093
Commit-Queue: Mike Klein <mtklein@chromium.org>
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@chromium.org>
1 file changed