Add AA flag to TessellationCache key

bug:15539571
Change-Id: I7cf470ca962041ab3c00c740e87c6ae9a95f06a8
diff --git a/libs/hwui/TessellationCache.h b/libs/hwui/TessellationCache.h
index 8f37230..d4ff943 100644
--- a/libs/hwui/TessellationCache.h
+++ b/libs/hwui/TessellationCache.h
@@ -55,6 +55,7 @@
         };
 
         Type type;
+        bool aa;
         SkPaint::Cap cap;
         SkPaint::Style style;
         float strokeWidth;