Add isolate tag-profile and better handling of errors

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

Index: runtime/bin/vmservice/client/lib/src/app/chart.dart
diff --git a/runtime/bin/vmservice/client/lib/src/app/chart.dart b/runtime/bin/vmservice/client/lib/src/app/chart.dart
index 77b80a1315a199b67b8e3e4e7ab3c96dfda90ac5..6c433069a0278ad2ff4d5e1fba574df4e416f2c8 100644
--- a/runtime/bin/vmservice/client/lib/src/app/chart.dart
+++ b/runtime/bin/vmservice/client/lib/src/app/chart.dart
@@ -82,8 +82,8 @@ class Chart {
   var _chart;
   final Map options = new Map();
 
-  /// Create a Google Chart of [chartType]. e.g. 'Table', 'BarChart', the
-  /// chart is rendered inside [element].
+  /// Create a Google Chart of [chartType]. e.g. 'Table', 'AreaChart',
+  /// 'BarChart', the chart is rendered inside [element].
   Chart(String chartType, Element element) {
     _chart = new JsObject(GoogleChart.api[chartType], [element]);
   }