run clean branch baseline only once
BUG=skia:
Review URL: https://codereview.chromium.org/874643002
diff --git a/bin/ac b/bin/ac
index d9e0fd3..05fd605 100755
--- a/bin/ac
+++ b/bin/ac
@@ -11,10 +11,12 @@
exit 1
fi
-git checkout $CLEAN
-./gyp_skia >/dev/null
-platform_tools/android/bin/android_ninja -t Release nanobench
-platform_tools/android/bin/android_run_skia -t Release nanobench $@ --skps /data/local/tmp/skps -i /data/local/tmp/resources --samples $SAMPLES -v > $CLEAN.log
+if [ ! -f $CLEAN.log ]; then
+ git checkout $CLEAN
+ ./gyp_skia >/dev/null
+ platform_tools/android/bin/android_ninja -t Release nanobench
+ platform_tools/android/bin/android_run_skia -t Release nanobench $@ --skps /data/local/tmp/skps -i /data/local/tmp/resources --samples $SAMPLES -v > $CLEAN.log
+fi
git checkout $BRANCH
./gyp_skia >/dev/null