Add SkGetExecutablePath API to tools.

Change-Id: I1f0e933924067df0720fc02e2a516bde3d2f74a0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/596116
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
5 files changed