add serial procs to pictures

Bug: skia:7380
Change-Id: Ic1b7e437316c7913711cf5cb119e3fe904cd2c05
Reviewed-on: https://skia-review.googlesource.com/76980
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
diff --git a/gn/tests.gni b/gn/tests.gni
index 03e0a44..8c08d16 100644
--- a/gn/tests.gni
+++ b/gn/tests.gni
@@ -203,6 +203,7 @@
   "$_tests/ScalarTest.cpp",
   "$_tests/ScaleToSidesTest.cpp",
   "$_tests/SerializationTest.cpp",
+  "$_tests/SerialProcsTest.cpp",
   "$_tests/ShaderOpacityTest.cpp",
   "$_tests/ShaderTest.cpp",
   "$_tests/ShadowTest.cpp",