Add gray_8_as_lum and _as_red private grpixelconfigs

Bug: skia:
Change-Id: I70cbd0bc9f7a7a16fb9f0688d272d7afa607700a
Reviewed-on: https://skia-review.googlesource.com/80622
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
diff --git a/tests/GrSurfaceTest.cpp b/tests/GrSurfaceTest.cpp
index 2ab714f..8cb6f7e 100644
--- a/tests/GrSurfaceTest.cpp
+++ b/tests/GrSurfaceTest.cpp
@@ -85,6 +85,8 @@
         kAlpha_8_as_Alpha_GrPixelConfig,
         kAlpha_8_as_Red_GrPixelConfig,
         kGray_8_GrPixelConfig,
+        kGray_8_as_Lum_GrPixelConfig,
+        kGray_8_as_Red_GrPixelConfig,
         kRGB_565_GrPixelConfig,
         kRGBA_4444_GrPixelConfig,
         kRGBA_8888_GrPixelConfig,