[bazel] Add location for G3 define

Change-Id: I7811e0e70e4959be8caa1cab9e4f1fa3421d72d1
Bug: skia:13211
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/536596
Reviewed-by: Jorge Betancourt <jmbetancourt@google.com>
1 file changed