impl SkTPin with std::{min,max}

Change-Id: I70b2fdea570a9091afc81a1455fa61f90b0357a1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/327786
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
2 files changed