Fixup textblob benchmark

* Correctly translate glyphs
* Make subpixel
* Use subpixel positions

Change-Id: I0011fb6cc8b985c9a7bd058f8b2fbf4b525019de
Reviewed-on: https://skia-review.googlesource.com/c/160500
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Herb Derby <herb@google.com>
1 file changed