Add SK_API to GrContextThreadSafeProxy

TBR=egdaniel@google.com
TBR=bsalomon@google.com
Change-Id: I7dabb22ae391c6ec124bdfc65c4120de4193352e
Reviewed-on: https://skia-review.googlesource.com/117235
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed