Include DETACHED, NEEDS-LAYOUT, and relayoutSubtreeRoot info in the debug output for the render tree

sky/sdk/lib/framework/rendering/object.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import '../node.dart';
 import '../scheduler.dart' as scheduler;
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 
 class ParentData {
@@ skipping 204 matching lines @@
   //   // For each child that intersects x,y, in z-order starting from the top,
   //   // call hitTest() for that child, passing it /result/, and the coordinates
   //   // converted to the child's coordinate origin, and stop at the first child
   //   // that returns true.
   //   // Then, add yourself to /result/, and return true.
   // }
   // You must not add yourself to /result/ if you return false.
 
 
   String toString([String prefix = '']) {
-    String header = '${runtimeType}\n';
+    String header = '${runtimeType}';
+    if (_relayoutSubtreeRoot != null && _relayoutSubtreeRoot != this) {
+      int count = 1;
+      RenderObject target = parent;
+      while (target != null && target != _relayoutSubtreeRoot) {
+        target = target.parent as RenderObject;
+        count += 1;
+      }
+      header += ' relayoutSubtreeRoot=up$count';
+    }
+    if (_needsLayout)
+      header += ' NEEDS-LAYOUT';
+    if (!attached)
+      header += ' DETACHED';
     prefix += '  ';
-    return '${header}${debugDescribeSettings(prefix)}${debugDescribeChildren(prefix)}';
+    return '${header}\n${debugDescribeSettings(prefix)}${debugDescribeChildren(prefix)}';
   }
   String debugDescribeSettings(String prefix) => '${prefix}parentData: ${parentData}\n';
   String debugDescribeChildren(String prefix) => '';
 
 }
 
 class HitTestResult {
   final List<RenderObject> path = new List<RenderObject>();
 
   RenderObject get result => path.first;
@@ skipping 184 matching lines @@
     int count = 1;
     ChildType child = _firstChild;
     while (child != null) {
       result += '${prefix}child ${count}: ${child.toString(prefix)}';
       count += 1;
       child = child.parentData.nextSibling;
     }
     return result;
   }
 }