Add additional guard to the Analytic AA change

This shall fix the DEPS roll.

BUG=skia:

Change-Id: I3ac208a8025c3408729b9e24e9c01e9f007a1799
Reviewed-on: https://skia-review.googlesource.com/5329
Reviewed-by: Yuqian Li <liyuqian@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
1 file changed