Add flags word to context initialization.

bug 10427951

Change-Id: If3b9337712bd16655de4a42ccf829bbcd9e01b6e
diff --git a/rsDefines.h b/rsDefines.h
index 0287f67..741f67b 100644
--- a/rsDefines.h
+++ b/rsDefines.h
@@ -395,6 +395,13 @@
 
 } RsScriptCall;
 
+enum RsContextFlags {
+    RS_CONTEXT_SYNCHRONOUS = 1,
+    RS_CONTEXT_LOW_LATENCY = 2,
+    RS_CONTEXT_MAX = 4
+};
+
+
 #ifdef __cplusplus
 };
 #endif