use font in tool_utils add_to_text_blob()

Bug: skia:
Change-Id: Ie0b56a56bd7a1f67bfaad90d30ac7d0477944a61
Reviewed-on: https://skia-review.googlesource.com/c/179982
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Reed <reed@google.com>
8 files changed