IWYU -- SkShader.h

Bug: skia:
Change-Id: I57bffc14c4888627a22158e35f3ac3b762138f02
Reviewed-on: https://skia-review.googlesource.com/98520
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/src/shaders/gradients/Sk4fGradientBase.cpp b/src/shaders/gradients/Sk4fGradientBase.cpp
index ee701bd..19eabcf 100644
--- a/src/shaders/gradients/Sk4fGradientBase.cpp
+++ b/src/shaders/gradients/Sk4fGradientBase.cpp
@@ -6,7 +6,7 @@
  */
 
 #include "Sk4fGradientBase.h"
-
+#include "SkPaint.h"
 #include <functional>
 
 namespace {