void onDraw(SkCanvas* canvas) override {
     SkPaint blurPaint;
     SkAutoTUnref<SkImageFilter> blur(SkBlurImageFilter::Create(5.0f, 5.0f));
     blurPaint.setImageFilter(blur);
     const SkScalar tile_size = SkIntToScalar(128);
     SkRect bounds;
     if (!canvas->getClipBounds(&bounds)) {
         bounds.setEmpty();
     }
     int ts = SkScalarCeilToInt(tile_size);
     SkImageInfo info = SkImageInfo::MakeN32Premul(ts, ts);
     SkAutoTUnref<SkSurface> tileSurface(canvas->newSurface(info));
     if (!tileSurface.get()) {
         tileSurface.reset(SkSurface::NewRaster(info));
     }
     SkCanvas* tileCanvas = tileSurface->getCanvas();
     for (SkScalar y = bounds.top(); y < bounds.bottom(); y += tile_size) {
         for (SkScalar x = bounds.left(); x < bounds.right(); x += tile_size) {
             tileCanvas->save();
             tileCanvas->clear(0);
             tileCanvas->translate(-x, -y);
             SkRect rect = SkRect::MakeWH(WIDTH, HEIGHT);
             tileCanvas->saveLayer(&rect, &blurPaint);
             SkRRect rrect = SkRRect::MakeRectXY(rect.makeInset(20, 20), 25, 25);
             tileCanvas->clipRRect(rrect, SkRegion::kDifference_Op, true);
             SkPaint paint;
             tileCanvas->drawRect(rect, paint);
             tileCanvas->restore();
             tileCanvas->restore();
             canvas->drawImage(tileSurface->makeImageSnapshot().get(), x, y);
         }
     }
 }
// http://crbug.com/472147
// RRect radii not properly scaled.
static void test_crbug_472147_actual(skiatest::Reporter* reporter) {
    auto surface(SkSurface::MakeRasterN32Premul(1000, 1000));
    SkCanvas* canvas = surface->getCanvas();
    SkPaint p;
    SkRect r = SkRect::MakeLTRB(-246.0f, 33.0f, 848.0f, 33554464.0f);
    SkVector radii[4] = {
        { 13.0f, 8.0f }, { 170.0f, 2.0 }, { 256.0f, 33554430.0f }, { 120.0f, 5.0f }
    };
    SkRRect rr;
    rr.setRectRadii(r, radii);
    canvas->clipRRect(rr);

    SkRect r2 = SkRect::MakeLTRB(0, 33, 1102, 33554464);
    canvas->drawRect(r2, p);
}