Add ContextRec param to SkShader::contextSize()

src/effects/gradients/SkLinearGradient.cpp

Index: src/effects/gradients/SkLinearGradient.cpp
diff --git a/src/effects/gradients/SkLinearGradient.cpp b/src/effects/gradients/SkLinearGradient.cpp
index 9a350b8ff2bce28207236f3c91e31df5a4569d7e..1fbd96e40ebc5a2a75b58a8983016f08c4f97de3 100644
--- a/src/effects/gradients/SkLinearGradient.cpp
+++ b/src/effects/gradients/SkLinearGradient.cpp
@@ -81,7 +81,7 @@ void SkLinearGradient::flatten(SkWriteBuffer& buffer) const {
     buffer.writePoint(fEnd);
 }
 
-size_t SkLinearGradient::contextSize() const {
+size_t SkLinearGradient::contextSize(const ContextRec&) const {
     return use_4f_context(fGradFlags)
         ? sizeof(LinearGradient4fContext)
         : sizeof(LinearGradientContext);