Help type deduction for old compilers

GCC 7 can't do the type deduction without braces. 8+ seems fine without
this. Skia doesn't really support GCC versions older than 8, but the
slightly more verbose invocation is fine for developers, so I think
it's fine to add here.

https://godbolt.org/z/W6avPxfM1

Change-Id: I5c055186f0ced6491f492f87ef65d85661beb5ef
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/925356
Auto-Submit: Kaylee Lubick <kjlubick@google.com>
Reviewed-by: Daniel Dilan <danieldilan@google.com>
Commit-Queue: Daniel Dilan <danieldilan@google.com>
1 file changed