Look for GL_ARB_texture_rectangle on SwiftShader contexts

Bug: skia:9832
Change-Id: Id3841a36dc94f16db4c06398944a7b0497344ccd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/289136
Commit-Queue: Greg Daniel <egdaniel@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
1 file changed