add skia to forked list

Change-Id: I15df9f2c27497e4fca85065d3b07ed916d19cf21
diff --git a/utils/aosp-forked-list b/utils/aosp-forked-list
index 5b2486c..073ab54 100644
--- a/utils/aosp-forked-list
+++ b/utils/aosp-forked-list
@@ -9,6 +9,7 @@
 external/tinycompress
 external/toybox
 external/selinux
+external/skia
 frameworks/av
 frameworks/base
 frameworks/native