Minor geometry processor clarification.

Some renames, comments, and override->final

Change-Id: Iebc7aeee9a64021e958f76bf4278ffff56884a56
Reviewed-on: https://skia-review.googlesource.com/35165
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/tests/PrimitiveProcessorTest.cpp b/tests/PrimitiveProcessorTest.cpp
index 14851a9..1e764e1 100644
--- a/tests/PrimitiveProcessorTest.cpp
+++ b/tests/PrimitiveProcessorTest.cpp
@@ -70,7 +70,7 @@
                     void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
                         const GP& gp = args.fGP.cast<GP>();
                         args.fVaryingHandler->emitAttributes(gp);
-                        this->setupPosition(args.fVertBuilder, gpArgs, gp.getAttrib(0).fName);
+                        this->writeOutputPosition(args.fVertBuilder, gpArgs, gp.getAttrib(0).fName);
                         GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder;
                         fragBuilder->codeAppendf("%s = float4(1);", args.fOutputColor);
                         fragBuilder->codeAppendf("%s = float4(1);", args.fOutputCoverage);