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

src/gpu/GrProcessor.cpp

Index: src/gpu/GrProcessor.cpp
diff --git a/src/gpu/GrProcessor.cpp b/src/gpu/GrProcessor.cpp
index 4f6d8788b108fbd6b9065faa12cbf1e73452fa59..7a3335c3056a5f4587bc41a537c790dba9c78d37 100644
--- a/src/gpu/GrProcessor.cpp
+++ b/src/gpu/GrProcessor.cpp
@@ -241,6 +241,10 @@
     return true;
 }
 
+void GrFragmentProcessor::computeInvariantOutput(GrInvariantOutput* inout) const {
+    this->onComputeInvariantOutput(inout);
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 // Initial static variable from GrXPFactory