Make GrGLSLPrimitiveProcessor::emitTransforms take local coords as GrShaderVar.

Also remove unused position variable parameter.

Change-Id: I37f98a03ac1ca750810de13b08e3ffa11e41828c
Reviewed-on: https://skia-review.googlesource.com/81320
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/ops/GrAAConvexPathRenderer.cpp b/src/gpu/ops/GrAAConvexPathRenderer.cpp
index 3c84b32..b706d68 100644
--- a/src/gpu/ops/GrAAConvexPathRenderer.cpp
+++ b/src/gpu/ops/GrAAConvexPathRenderer.cpp
@@ -582,8 +582,7 @@
             this->emitTransforms(vertBuilder,
                                  varyingHandler,
                                  uniformHandler,
-                                 gpArgs->fPositionVar,
-                                 qe.fInPosition->fName,
+                                 qe.fInPosition->asShaderVar(),
                                  qe.fLocalMatrix,
                                  args.fFPCoordTransformHandler);