add gm calling textblob intercepts with spacing

Bug: skia:
Change-Id: Ibff3d2ee6375ef4db2235a5c3f0714b02bdb3d74
Reviewed-on: https://skia-review.googlesource.com/c/177025
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
4 files changed