More carefully disable stages in Ganesh to avoid textures or effects
leaking between draw calls.

http://codereview.appspot.com/6353083/



git-svn-id: http://skia.googlecode.com/svn/trunk@4510 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrSWMaskHelper.cpp b/src/gpu/GrSWMaskHelper.cpp
index fe32110..317fd41 100644
--- a/src/gpu/GrSWMaskHelper.cpp
+++ b/src/gpu/GrSWMaskHelper.cpp
@@ -226,6 +226,6 @@
                             SK_Scalar1 * rect.fRight,
                             SK_Scalar1 * rect.fBottom);
     target->drawRect(dstRect, NULL, stageMask, srcRects, NULL);
-    drawState->setTexture(kPathMaskStage, NULL);
+    drawState->disableStage(kPathMaskStage);
 }