rename inner AsFPArgs to stand-alone GrFPArgs

This prepares us to share this with other effects (most notably maskfilters)

Bug: skia:
Change-Id: I12530fdf10c4e5f2a9ab6d394bf9e87c54ea60c4
Reviewed-on: https://skia-review.googlesource.com/97062
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/src/shaders/gradients/SkLinearGradient.cpp b/src/shaders/gradients/SkLinearGradient.cpp
index 40e2271..86e8179 100644
--- a/src/shaders/gradients/SkLinearGradient.cpp
+++ b/src/shaders/gradients/SkLinearGradient.cpp
@@ -185,7 +185,7 @@
 /////////////////////////////////////////////////////////////////////
 
 std::unique_ptr<GrFragmentProcessor> SkLinearGradient::asFragmentProcessor(
-        const AsFPArgs& args) const {
+        const GrFPArgs& args) const {
     SkASSERT(args.fContext);
 
     SkMatrix matrix;