Added stack to AA clip mask cache

http://codereview.appspot.com/6201058/



git-svn-id: http://skia.googlecode.com/svn/trunk@3885 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrClipMaskManager.cpp b/src/gpu/GrClipMaskManager.cpp
index 1a892d8..f8c43b0 100644
--- a/src/gpu/GrClipMaskManager.cpp
+++ b/src/gpu/GrClipMaskManager.cpp
@@ -396,7 +396,7 @@
 
     if (fAACache.canReuse(clipIn, rt->width(), rt->height())) {
         *result = fAACache.getLastMask();
-        *resultBounds = fAACache.getLastBound();
+        fAACache.getLastBound(resultBounds);
         return true;
     }