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

src/gpu/effects/GrDitherEffect.cpp

Index: src/gpu/effects/GrDitherEffect.cpp
diff --git a/src/gpu/effects/GrDitherEffect.cpp b/src/gpu/effects/GrDitherEffect.cpp
index 33928a0d4c569cd01c741cd094eb8f2a7f129cdf..048247c59b576a6a8d7f16601a302942f005f164 100644
--- a/src/gpu/effects/GrDitherEffect.cpp
+++ b/src/gpu/effects/GrDitherEffect.cpp
@@ -53,7 +53,7 @@ void DitherEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const {
 
 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(DitherEffect);
 
-GrFragmentProcessor* DitherEffect::TestCreate(GrProcessorTestData*) {
+const GrFragmentProcessor* DitherEffect::TestCreate(GrProcessorTestData*) {
     return DitherEffect::Create();
 }