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

Committed: https://skia.googlesource.com/skia/+/ecfdc251be71f3d634e76afdd6375bf55fc061aa

Review URL: https://codereview.chromium.org/1316513002
diff --git a/src/effects/SkMorphologyImageFilter.cpp b/src/effects/SkMorphologyImageFilter.cpp
index cde29c0..2c99af9 100644
--- a/src/effects/SkMorphologyImageFilter.cpp
+++ b/src/effects/SkMorphologyImageFilter.cpp
@@ -445,7 +445,7 @@
 
 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrMorphologyEffect);
 
-GrFragmentProcessor* GrMorphologyEffect::TestCreate(GrProcessorTestData* d) {
+const GrFragmentProcessor* GrMorphologyEffect::TestCreate(GrProcessorTestData* d) {
     int texIdx = d->fRandom->nextBool() ? GrProcessorUnitTest::kSkiaPMTextureIdx :
                                       GrProcessorUnitTest::kAlphaTextureIdx;
     Direction dir = d->fRandom->nextBool() ? kX_Direction : kY_Direction;