We want to hide this API from general public use. Chromium can dig into
skia to include it as it does with other Skia API's that are in src
Bug: skia:
Change-Id: I00dc36d181237ea0785eefb31ad6c2d4e50e3c68
Reviewed-on: https://skia-review.googlesource.com/c/180648
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>