Require generation to be GLSL 3.30 in GrShaderCaps::supportsSkSLES3().

Real devices exist which support derivatives, non-square matrices, and
unsigned integers, but do not support all of ES3. On our tree,
ChromeOS-Clang-Sparky360-GPU-IntelUHDGraphics605-x86_64 meets this
criteria.

Change-Id: I6ae438c8cde291ca834f61700463a2df55705cb0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/441077
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed