Major rework of vm service events.

runtime/observatory/lib/src/elements/script_inset.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.
 
 library script_inset_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'observatory_element.dart';
 import 'package:observatory/service.dart';
@@ skipping 266 matching lines @@
 @CustomTag('breakpoint-toggle')
 class BreakpointToggleElement extends ObservatoryElement {
   @published ScriptLine line;
   @observable bool busy = false;
 
   void toggleBreakpoint(var a, var b, var c) {
     if (busy) {
       return;
     }
     busy = true;
-    if (line.bpt == null) {
+    if (line.breakpoints == null) {
       // No breakpoint.  Add it.
       line.script.isolate.addBreakpoint(line.script, line.line).then((_) {
           busy = false;
       });
     } else {
       // Existing breakpoint.  Remove it.
-      line.script.isolate.removeBreakpoint(line.bpt).then((_) {
-          busy = false;
+      List pending = [];
+      for (var bpt in line.breakpoints) {
+        pending.add(line.script.isolate.removeBreakpoint(bpt));
+      }
+      Future.wait(pending).then((_) {
+        busy = false;
       });
     }
   }
 
   BreakpointToggleElement.created() : super.created();
 }