srgb conversion needs to be in unpremul

Bug: skia:
Change-Id: Ic7dffb2cb30aae33a6c127ab10ea4282e1360114
Reviewed-on: https://skia-review.googlesource.com/21536
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
diff --git a/gn/gm.gni b/gn/gm.gni
index b9bfd4b..077b80a 100644
--- a/gn/gm.gni
+++ b/gn/gm.gni
@@ -274,6 +274,7 @@
   "$_gm/smallpaths.cpp",
   "$_gm/spritebitmap.cpp",
   "$_gm/srcmode.cpp",
+  "$_gm/srgb.cpp",
   "$_gm/stlouisarch.cpp",
   "$_gm/stringart.cpp",
   "$_gm/stroke_rect_shader.cpp",