Mark SkGetThreadID SK_SPI in debug.

Bug: skia:10381
Change-Id: I92feb4a668738d7f9375a6f204c663f1eb1b3a9b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/301009
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
1 file changed