Resubmission of 21573, with corrected strndup call.

runtime/bin/vmstats/bargraph.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.vmstats;
 
 class BarGraph {
   CanvasElement _canvas;
   GraphModel _model;
   List<Element> _elements;
@@ skipping 170 matching lines @@
   int get minTotal {
     var min = _LARGE_LENGTH;
     _samples.forEach((Sample s) => min = (s.total() < min ? s.total() : min));
     return min;
   }
 
   /**
    * Returns the maximum total from all the samples.
    */
   int get maxTotal {
-    var max = 0;
+    var max = 1;  // Must be non-zero.
     _samples.forEach((Sample s) => max = (s.total() > max ? s.total() : max));
     return max;
   }
 }
 
 /**
  * An element is a data type that gets charted. Each element has a name for
  * the legend, and a color for the bar graph. The number of elements in a
  * graph should match the number of segments in each sample.
  */
@@ skipping 14 matching lines @@
 
   int get length => _segments.length;
   int operator[](int i) => _segments[i];
 
   Iterator<int> get iterator => _segments.iterator;
 
   int total() {
     return _segments.fold(0, (int prev, int element) => prev + element);
   }
 }