Add flags for low power context.

Change-Id: I46b4fb7555f088dd90a9f8b7283d5b3aa75ceb1c
diff --git a/rsDefines.h b/rsDefines.h
index 1731eb7..1259610 100644
--- a/rsDefines.h
+++ b/rsDefines.h
@@ -399,9 +399,9 @@
 } RsScriptCall;
 
 enum RsContextFlags {
-    RS_CONTEXT_SYNCHRONOUS = 1,
-    RS_CONTEXT_LOW_LATENCY = 2,
-    RS_CONTEXT_MAX = 4
+    RS_CONTEXT_SYNCHRONOUS      = 0x0001,
+    RS_CONTEXT_LOW_LATENCY      = 0x0002,
+    RS_CONTEXT_LOW_POWER        = 0x0004
 };