Turned on SkSL->GLSL compiler
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2288033003

Committed: https://skia.googlesource.com/skia/+/9b0fe3d125f237d9884732a48414fa85fc71b4e3
Committed: https://skia.googlesource.com/skia/+/b12b3c6908c62c908b3680be01e3b5bfd30de310
Committed: https://skia.googlesource.com/skia/+/f008b0a59f45c0d4bea3e66faf3b01805009ec89
Committed: https://skia.googlesource.com/skia/+/08b2ccf398e2b81bc05d2c105837e5419899469b
Committed: https://skia.googlesource.com/skia/+/dcfe6dba4a335e50e86ff68e3252065d4197432c
Committed: https://skia.googlesource.com/skia/+/ccb1dd8f267f9d7fe7c9d0ce222ebc81b41853b3
Review-Url: https://codereview.chromium.org/2288033003
diff --git a/gyp/sksl.gyp b/gyp/sksl.gyp
index 609ace9..f45b702 100644
--- a/gyp/sksl.gyp
+++ b/gyp/sksl.gyp
@@ -18,7 +18,7 @@
       ],
       'all_dependent_settings': {
         'include_dirs': [
-          '../src/sksl',
+          '<(skia_src_path)/sksl',
         ],
       },
     },