Compute correct bounds for DrawShadowRec.

Bug: skia:6880
Change-Id: Ia8b94e52eec3feb5104d2351bf7a7e6f99101deb
Reviewed-on: https://skia-review.googlesource.com/26370
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/gn/core.gni b/gn/core.gni
index ab88241..fbb4c7a 100644
--- a/gn/core.gni
+++ b/gn/core.gni
@@ -115,6 +115,8 @@
   "$_src/core/SkDrawable.cpp",
   "$_src/core/SkDrawLooper.cpp",
   "$_src/core/SkDrawProcs.h",
+  "$_src/core/SkDrawShadowInfo.cpp",
+  "$_src/core/SkDrawShadowInfo.h",
   "$_src/core/SkEdgeBuilder.cpp",
   "$_src/core/SkEdgeBuilder.h",
   "$_src/core/SkEdgeClipper.cpp",