Prefixed the names of SkSL token constants.

This is to avoid conflicts with macros defined by Windows include files.
We were previously #undefing these macros, but that ended up causing its
own problems.

Change-Id: Ib16dd93bd5dbdb4ffd87d560c21c5b344bf67a9d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/284277
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
16 files changed