Fix UI bug: Hovering over dots highlights params again
Fix UI bug: Hovering over dots highlights params again

BUG=skia:
TBR=jcgregorio

Review URL: https://codereview.chromium.org/1430293003

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