gold: Fix zoom crosshair sometimes being sized incorrectly.
gold: Fix zoom crosshair sometimes being sized incorrectly.

Non-zero style widths need to have units, otherwise they are ignored, but not always.

BUG=skia:
TBR=mtklein

Review URL: https://codereview.chromium.org/1239953002

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot