To reproduce
1. Apply a bunch of in-flight patches (this is just a work log for me, sorry for the incomplete repro steps)
2. Run any of the layout tests with SW raster
     images/color-profile-svg.html
     images/size-failure.html
3. Fail at the DCHECK software_image_decode_cache.cc(590)] Check failed: image. 

This is from the block

  if (target_color_space) {
    TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cc.debug"),
                 "SoftwareImageDecodeCache::GetOriginalSizeImageDecode - "
                 "color conversion");
    image = image->makeColorSpace(target_color_space,
                                  SkTransferFunctionBehavior::kIgnore);
    DCHECK(image);
  }

The call to SkImage::makeColorSpace is failing.

I'll dig in to see where this is going wrong.