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/GrDistanceFieldGeoProc.cpp b/src/gpu/effects/GrDistanceFieldGeoProc.cpp
index aafabde..fda2f9d 100644
--- a/src/gpu/effects/GrDistanceFieldGeoProc.cpp
+++ b/src/gpu/effects/GrDistanceFieldGeoProc.cpp
@@ -72,8 +72,7 @@
         this->emitTransforms(vertBuilder,
                              varyingHandler,
                              uniformHandler,
-                             gpArgs->fPositionVar,
-                             dfTexEffect.inPosition()->fName,
+                             dfTexEffect.inPosition()->asShaderVar(),
                              args.fFPCoordTransformHandler);
 
         // add varyings
@@ -365,8 +364,7 @@
             this->emitTransforms(vertBuilder,
                                  varyingHandler,
                                  uniformHandler,
-                                 gpArgs->fPositionVar,
-                                 dfTexEffect.inPosition()->fName,
+                                 dfTexEffect.inPosition()->asShaderVar(),
                                  args.fFPCoordTransformHandler);
         } else {
             // Setup position
@@ -376,8 +374,7 @@
             this->emitTransforms(vertBuilder,
                                  varyingHandler,
                                  uniformHandler,
-                                 gpArgs->fPositionVar,
-                                 dfTexEffect.inPosition()->fName,
+                                 dfTexEffect.inPosition()->asShaderVar(),
                                  dfTexEffect.matrix(),
                                  args.fFPCoordTransformHandler);
         }
@@ -633,8 +630,7 @@
         this->emitTransforms(vertBuilder,
                              varyingHandler,
                              uniformHandler,
-                             gpArgs->fPositionVar,
-                             dfTexEffect.inPosition()->fName,
+                             dfTexEffect.inPosition()->asShaderVar(),
                              args.fFPCoordTransformHandler);
 
         // set up varyings