flag to use const& instead of const* for src-rect

src/effects/SkTestImageFilters.cpp

Index: src/effects/SkTestImageFilters.cpp
diff --git a/src/effects/SkTestImageFilters.cpp b/src/effects/SkTestImageFilters.cpp
index cd277ec225e9127c1cb23a9ed1612f8f2686850e..43b43a58fc04362115ea3e6e20237fd99018c82d 100755
--- a/src/effects/SkTestImageFilters.cpp
+++ b/src/effects/SkTestImageFilters.cpp
@@ -69,9 +69,7 @@ bool SkDownSampleImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src,
         }
         OwnDeviceCanvas canvas(dev);
 
-        SkRect r = SkRect::MakeWH(SkIntToScalar(src.width()),
-                                  SkIntToScalar(src.height()));
-        canvas.drawBitmapRect(tmp, r);
+        canvas.drawBitmapRect(tmp, SkRect::MakeIWH(src.width(), src.height()), nullptr);
         *result = dev->accessBitmap(false);
     }
     return true;