Initial attempt at jank-tracking stat collection

Is a bit naive, perhaps overly aggressive, but sorta works

Change-Id: I01a774e00dbe681439c02557d9728ae43c45ce50
diff --git a/libs/hwui/utils/Macros.h b/libs/hwui/utils/Macros.h
index 5ca9083..b93f720 100644
--- a/libs/hwui/utils/Macros.h
+++ b/libs/hwui/utils/Macros.h
@@ -35,4 +35,12 @@
         static_assert(std::is_standard_layout<Type>::value, \
         #Type " must have standard layout")
 
+#define HWUI_ENUM(name, ...) \
+    namespace name { \
+        enum _##name { \
+            __VA_ARGS__ \
+        }; \
+    } \
+    typedef enum name::_##name name##Enum
+
 #endif /* MACROS_H */