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/effects/GrBitmapTextGeoProc.cpp b/src/gpu/effects/GrBitmapTextGeoProc.cpp
index d5f930f..df71f70 100644
--- a/src/gpu/effects/GrBitmapTextGeoProc.cpp
+++ b/src/gpu/effects/GrBitmapTextGeoProc.cpp
@@ -58,8 +58,7 @@
         this->emitTransforms(vertBuilder,
                              varyingHandler,
                              uniformHandler,
-                             gpArgs->fPositionVar,
-                             btgp.inPosition()->fName,
+                             btgp.inPosition()->asShaderVar(),
                              btgp.localMatrix(),
                              args.fFPCoordTransformHandler);