use font for measuring/paths

add get_text_path to sk_tool_utils

Bug: skia:
Change-Id: I45426bc018cd8a5a0309fd6a73adb30755e8155a
Reviewed-on: https://skia-review.googlesource.com/c/179847
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>
3 files changed