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/GrTextContext.cpp b/src/gpu/GrTextContext.cpp
index 59b9cb3..41949fb 100644
--- a/src/gpu/GrTextContext.cpp
+++ b/src/gpu/GrTextContext.cpp
@@ -29,7 +29,7 @@
     GrDrawState* drawState = fDrawTarget->drawState();
     if (fCurrVertex > 0) {
         // setup our sampler state for our text texture/atlas
-        drawState->sampler(kGlyphMaskStage)->reset();
+        drawState->stage(kGlyphMaskStage)->reset();
 
         GrAssert(GrIsALIGN4(fCurrVertex));
         GrAssert(fCurrTexture);