Fix repaint in CT
Fix repaint in CT

It was broken due to changes in https://codereview.chromium.org/1127413002/

BUG=skia:3823
TBR=jcgregorio

Review URL: https://codereview.chromium.org/1136093002

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