Fix datahopper flags
Fix datahopper flags

BUG=skia:
TBR=jcgregorio

Review URL: https://codereview.chromium.org/1370143002

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot