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/src/gpu/GrClipMaskManager.cpp b/src/gpu/GrClipMaskManager.cpp
index 6104f66..c1effd7 100644
--- a/src/gpu/GrClipMaskManager.cpp
+++ b/src/gpu/GrClipMaskManager.cpp
@@ -26,7 +26,7 @@
 ////////////////////////////////////////////////////////////////////////////////
 namespace {
 // set up the draw state to enable the aa clipping mask. Besides setting up the
-// sampler matrix this also alters the vertex layout
+// stage matrix this also alters the vertex layout
 void setup_drawstate_aaclip(GrGpu* gpu,
                             GrTexture* result,
                             const GrIRect &devBound) {
@@ -41,7 +41,7 @@
                      SkIntToScalar(-devBound.fTop));
     mat.preConcat(drawState->getViewMatrix());
 
-    drawState->sampler(kMaskStage)->reset();
+    drawState->stage(kMaskStage)->reset();
     drawState->createTextureEffect(kMaskStage, result, mat);
 }