I would expect that:

ColorFilterContents::MakeBlend(
      blend_mode_,
      {FilterInput::Make(dst_contents), FilterInput::Make(src_contents_)});

Should behave the same with a pipeline blend and an advanced blend. However in flutter/engine#38985 and flutter/engine#38335 I've observed that I actually need to switch the order to match Skia's rendering. This doesn't appear to happen with regular canvas drawing, so we must either be using a different constructor or compensating elsewhere.