Experiment to see if ANGLE ES2 vs ES3 perf is related to GLSL ver

Force ES2 level shading language on ANGLE.

Will be reverted. Only affects Skia tool builds.

Bug: skia:10644
Change-Id: Ic52d6afae7f784b173725a9353d5f43f2da3ca72
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/313703
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
1 file changed