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/SkComposeShader.h b/src/shaders/SkComposeShader.h
index 85d56cc..7efa06c 100644
--- a/src/shaders/SkComposeShader.h
+++ b/src/shaders/SkComposeShader.h
@@ -23,7 +23,7 @@
     }
 
 #if SK_SUPPORT_GPU
-    std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(const AsFPArgs&) const override;
+    std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(const GrFPArgs&) const override;
 #endif
 
 #ifdef SK_DEBUGx