BUG=angleproject:1941
TEST=dEQP-GLES31.functional.shaders.builtin_constants.*
     dEQP-GLES31.functional.shaders.builtin_functions.*_geometry
     dEQP-GLES31.functional.debug.negative_coverage.*.geometry_shader

Change-Id: I37b29e48f27ae31e3753efe00b849849879f848d
Reviewed-on: https://chromium-review.googlesource.com/954713
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jiajia Qin <jiajia.qin@intel.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>