Add logging to the new layers API.

Change-Id: I78b9426eb17de3e775aca9fafe4a50bd9c0785c4
diff --git a/libs/hwui/Debug.h b/libs/hwui/Debug.h
index ddbfa5e..a194cbe 100644
--- a/libs/hwui/Debug.h
+++ b/libs/hwui/Debug.h
@@ -44,4 +44,7 @@
 // Turn on to display debug info about textures
 #define DEBUG_TEXTURES 0
 
+// Turn on to display debug info about the layer renderer
+#define DEBUG_LAYER_RENDERER 0
+
 #endif // ANDROID_HWUI_DEBUG_H