Move strictES2Mode method to ProgramConfig.

This will help us migrate code out of IRGenerator.

Change-Id: Id9c70cc4577ed41b2fc5ad26f752caea13a56083
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/372437
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
2 files changed