Change SkShader;asFragmentProcessor signature to no longer take skpaint\grcolor*

src/effects/gradients/SkLinearGradient.h

Index: src/effects/gradients/SkLinearGradient.h
diff --git a/src/effects/gradients/SkLinearGradient.h b/src/effects/gradients/SkLinearGradient.h
index eddb35512f254e06d0ca3c337ec8659211f0ca2c..a1ae39fb44bfe353b942ce99a397559c0086a73e 100644
--- a/src/effects/gradients/SkLinearGradient.h
+++ b/src/effects/gradients/SkLinearGradient.h
@@ -29,9 +29,10 @@ public:
     };
 
     GradientType asAGradient(GradientInfo* info) const override;
-    bool asFragmentProcessor(GrContext*, const SkPaint&, const SkMatrix& viewM,
-                             const SkMatrix*, GrColor*, GrProcessorDataManager*,
-                             GrFragmentProcessor**) const override;
+#if SK_SUPPORT_GPU
+    const GrFragmentProcessor* asFragmentProcessor(GrContext*, const SkMatrix& viewM,
+        const SkMatrix*, SkFilterQuality, GrProcessorDataManager*) const override;
+#endif
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLinearGradient)