Rename GrSamplerState to GrEffectStage.

R=robertphillips@google.com
Review URL: https://codereview.appspot.com/6777053

git-svn-id: http://skia.googlecode.com/svn/trunk@6135 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/texdata.cpp b/gm/texdata.cpp
index bbc5efa..cc3476d 100644
--- a/gm/texdata.cpp
+++ b/gm/texdata.cpp
@@ -113,8 +113,8 @@
                 GrMatrix tm;
                 tm = vm;
                 tm.postIDiv(2*S, 2*S);
-                paint.colorSampler(0)->setEffect(SkNEW_ARGS(GrSingleTextureEffect,
-                                                            (texture)), tm)->unref();
+                paint.colorStage(0)->setEffect(SkNEW_ARGS(GrSingleTextureEffect,
+                                                          (texture)), tm)->unref();
 
                 ctx->drawRect(paint, GrRect::MakeWH(2*S, 2*S));