Yet more layer tracking logging

 Bug: 17208461

Change-Id: I55e7d0921eb565867e966d68b798b7b92c391b55
diff --git a/libs/hwui/RenderNode.h b/libs/hwui/RenderNode.h
index d897997..f329283 100644
--- a/libs/hwui/RenderNode.h
+++ b/libs/hwui/RenderNode.h
@@ -102,6 +102,7 @@
     };
 
     ANDROID_API static void outputLogBuffer(int fd);
+    void debugDumpLayers(const char* prefix);
 
     ANDROID_API void setStagingDisplayList(DisplayListData* newData);