nanobench: disable draw_stroke_rrect_miter, crashing on GPU
nanobench: disable draw_stroke_rrect_miter, crashing on GPU

BUG=skia:

Review URL: https://codereview.chromium.org/398003003

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