Add debug logs for display lists.

Change-Id: I7bae8fd96e9eccb51f29f73e4069b4d3e6bdbdd7
diff --git a/libs/hwui/Debug.h b/libs/hwui/Debug.h
index a194cbe..bdd8e73 100644
--- a/libs/hwui/Debug.h
+++ b/libs/hwui/Debug.h
@@ -47,4 +47,7 @@
 // Turn on to display debug info about the layer renderer
 #define DEBUG_LAYER_RENDERER 0
 
+// Turn on to dump display list state
+#define DEBUG_DISPLAY_LIST 0
+
 #endif // ANDROID_HWUI_DEBUG_H