Remove some implicit Point to PointF conversions, add helpers.

ui/gfx/image/image_skia_operations.cc

Index: ui/gfx/image/image_skia_operations.cc
diff --git a/ui/gfx/image/image_skia_operations.cc b/ui/gfx/image/image_skia_operations.cc
index d310f965d31aa2f3cbe2f4688ec3ed9d769393b7..edeb869d18a89e7683cbcf13689473d08c7f0b76 100644
--- a/ui/gfx/image/image_skia_operations.cc
+++ b/ui/gfx/image/image_skia_operations.cc
@@ -30,7 +30,7 @@ gfx::Size DIPToPixelSize(gfx::Size dip_size, float scale) {
 }
 
 gfx::Rect DIPToPixelBounds(gfx::Rect dip_bounds, float scale) {
-  return gfx::Rect(ToFlooredPoint(ScalePoint(dip_bounds.origin(), scale)),
+  return gfx::Rect(ScaleToFlooredPoint(dip_bounds.origin(), scale),
                    DIPToPixelSize(dip_bounds.size(), scale));
 }