Deliberately call typefaceproc only once per face in pictures

Before this CL, the new test would write out 2 copies of each typeface,
since each one is referenced twice in the picture.

Bug: skia:
Change-Id: I6ebfe6b5ea0bb0cca2869ef0cccad21a51e48411
Reviewed-on: https://skia-review.googlesource.com/151667
Auto-Submit: Mike Reed <reed@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Reed <reed@google.com>
3 files changed