Add accumulator to allocation profiler

runtime/bin/vmservice/client/lib/src/observatory/chart.dart

Index: runtime/bin/vmservice/client/lib/src/observatory/chart.dart
diff --git a/runtime/bin/vmservice/client/lib/src/observatory/chart.dart b/runtime/bin/vmservice/client/lib/src/observatory/chart.dart
index dc3f1923da8f7e25e1753be2d52815711ba448a5..37204e636a9b1ee6e2a4fb8e4d025bb0de937c8b 100644
--- a/runtime/bin/vmservice/client/lib/src/observatory/chart.dart
+++ b/runtime/bin/vmservice/client/lib/src/observatory/chart.dart
@@ -93,12 +93,11 @@ class Chart {
   /// with the current sort settings.
   void refreshOptionsSortInfo() {
     var props = _chart.callMethod('getSortInfo');
-    print(options);
-    if (props != null) {
+    if ((props != null) && (props['column'] != -1)) {
+      // Preserve current sort settings.
       options['sortColumn'] = props['column'];
       options['sortAscending'] = props['ascending'];
     }
-    print(options);
   }
 
   /// Draw this chart using [table] and the current [options].