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/GrClipMaskManager.cpp b/src/gpu/GrClipMaskManager.cpp
index c37affa..dcd32dd 100644
--- a/src/gpu/GrClipMaskManager.cpp
+++ b/src/gpu/GrClipMaskManager.cpp
@@ -446,7 +446,7 @@
 
     fGpu->drawSimpleRect(rect, NULL, 1 << 0);
 
-    drawState->setTexture(0, NULL);
+    drawState->disableStage(0);
 }
 
 // get a texture to act as a temporary buffer for AA clip boolean operations