Replace GrClip with SkClipStack

http://codereview.appspot.com/6449070/



git-svn-id: http://skia.googlecode.com/svn/trunk@4865 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index 2f05458..d6ac363 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -710,7 +710,7 @@
         GrContext*        fContext;
         const GrClipData* fOldClip;
 
-        GrClip            fNewClipStack;
+        SkClipStack       fNewClipStack;
         GrClipData        fNewClipData;
     };