Currently DecodingImageGenerator::QueryYUVA8 hardcodes the SkYUVColorSpace parameter to be kJPEG_SkYUVColorSpace, but it should choose based on image type.

With crbug.com/900264, there will be support for decoding and rendering WebP images from YUV. These images are converted to RGB by Skia in shaders.

However, WebP images that are eventually converted to RGB should use kRec601_SkYUVColorSpace, per the WebP container specification [1].

The solution right now is to hardcode this colorspace when calling SkImage::MakeFromYUVATextures from GpuImageDecodeCache::UploadImageIfNecessary, but it is much better style to have QueryYUVA8 determine the correct value based on image type (JPEG, WebP, or any future formats that support YUV decoding).

[1]: https://developers.google.com/speed/webp/docs/riff_container#simple_file_format_lossy