GMs:  add platform_font_manager to some names

Change-Id: I310f39d8a470729d5525fb4f82e6a45b882313f3
Reviewed-on: https://skia-review.googlesource.com/71341
Commit-Queue: Hal Canary <halcanary@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Ben Wagner <bungeman@google.com>
2 files changed