Create SkColorSpaceXform to handle color conversions

dm/DM.cpp

Index: dm/DM.cpp
diff --git a/dm/DM.cpp b/dm/DM.cpp
index 9dbd43adda05367aa7ec1fccbda964de73593d59..07934f8c1283e67805cf26e5f96d9f7e2b988060 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -803,6 +803,9 @@ static bool gather_srcs() {
     for (auto colorImage : colorImages) {
         ColorCodecSrc* src = new ColorCodecSrc(colorImage, ColorCodecSrc::kBaseline_Mode);
         push_src("image", "color_codec_baseline", src);
+
+        src = new ColorCodecSrc(colorImage, ColorCodecSrc::kSrcToLinear_Mode);
+        push_src("image", "color_codec_src_to_linear", src);
     }
 
     return true;