drawText Cleanup, part 2

Change-Id: I6765d623924d12c6eea2c402dd27eade61b73b66
Reviewed-on: https://skia-review.googlesource.com/c/182151
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Auto-Submit: Hal Canary <halcanary@google.com>