restore gradientshader.h

Change-Id: Id0cae1420ac78b5fa0d55ad823420463a1e8793a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1124076
Reviewed-by: Florin Malita <fmalita@google.com>
Commit-Queue: Mike Reed <mike@reedtribe.org>
Reviewed-by: Ben Wagner <bungeman@google.com>

include/gpu/graphite/precompile/PrecompileShader.h

diff --git a/include/gpu/graphite/precompile/PrecompileShader.h b/include/gpu/graphite/precompile/PrecompileShader.h
index 508050d..8d85947 100644
--- a/include/gpu/graphite/precompile/PrecompileShader.h
+++ b/include/gpu/graphite/precompile/PrecompileShader.h
@@ -12,7 +12,7 @@
 
 #include "include/core/SkBlendMode.h"
 #include "include/core/SkImageInfo.h"
-#include "include/effects/SkGradient.h"
+#include "include/effects/SkGradientShader.h"
 
 class SkColorSpace;