Removing FreeType references for Chrome

Step #1: Introduce a common FontScanner interface

Change-Id: Iaad2bda5b7351bad99a815522e1a6a02e8db4f9f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/796397
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Julia Lavrova <jlavrova@google.com>
15 files changed