Add debug logs for display lists.

Change-Id: I7bae8fd96e9eccb51f29f73e4069b4d3e6bdbdd7
diff --git a/libs/hwui/OpenGLDebugRenderer.h b/libs/hwui/OpenGLDebugRenderer.h
index 1cef267..aefa7bf 100644
--- a/libs/hwui/OpenGLDebugRenderer.h
+++ b/libs/hwui/OpenGLDebugRenderer.h
@@ -40,7 +40,7 @@
     int saveLayer(float left, float top, float right, float bottom,
             SkPaint* p, int flags);
 
-    void drawDisplayList(DisplayList* displayList);
+    void drawDisplayList(DisplayList* displayList, uint32_t level = 0);
     void drawLayer(Layer* layer, float x, float y, SkPaint* paint);
     void drawBitmap(SkBitmap* bitmap, float left, float top, SkPaint* paint);
     void drawBitmap(SkBitmap* bitmap, SkMatrix* matrix, SkPaint* paint);