make SK_SUPPORT_LEGACY_FONTMETRICS_IN_PAINT conditional

Bug: skia:
Change-Id: I467f177bfef74f3727127a251057f310ec3f3428
Reviewed-on: https://skia-review.googlesource.com/c/177063
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2 files changed