Android.mk: bench_pictures -> nanobench

We're only keeping bench_pictures around for the bots now.  For human-initiated work, nanobench is the way to go.

BUG=skia:
R=djsollen@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/484663002
1 file changed