Add accumulator to allocation profiler

runtime/bin/vmservice/client/lib/src/observatory/isolate.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 observatory;
 
 
 /// State for a running isolate.
 class Isolate extends Observable {
   static ObservatoryApplication _application;
-  
+
   @observable Profile profile;
   @observable final Map<String, Script> scripts =
       toObservable(new Map<String, Script>());
   @observable final List<Code> codes = new List<Code>();
   @observable String id;
   @observable String name;
   @observable Map entry;
   @observable String rootLib;
   @observable final Map<String, double> timers =
       toObservable(new Map<String, double>());
 
   @observable int newHeapUsed = 0;
   @observable int oldHeapUsed = 0;
 
   @observable Map topFrame = null;
   @observable String fileAndLine = null;
-  
+
   Isolate.fromId(this.id) : name = '' {}
-  
+
   Isolate.fromMap(Map map)
       : id = map['id'], name = map['name'] {
   }
 
   void refresh() {
     var request = '/$id/';
     _application.requestManager.requestMap(request).then((map) {
         update(map);
       }).catchError((e, trace) {
           Logger.root.severe('Error while updating isolate summary: $e\n$trace');
       });
   }
-  
+
   void update(Map map) {
     if (map['type'] != 'Isolate') {
       Logger.root.severe('Unexpected message type in Isolate.update: ${map["type"]}');
       return;
     }
     if (map['name'] == null ||
         map['rootLib'] == null ||
         map['timers'] == null ||
         map['heap'] == null) {
       Logger.root.severe("Malformed 'Isolate' response: $map");
@@ skipping 27 matching lines @@
   }
 
   String toString() => '$id';
 
   Code findCodeByAddress(int address) {
     for (var i = 0; i < codes.length; i++) {
       if (codes[i].contains(address)) {
         return codes[i];
       }
     }
+    return null;
   }
 
   Code findCodeByName(String name) {
     for (var i = 0; i < codes.length; i++) {
       if (codes[i].name == name) {
         return codes[i];
       }
     }
+    return null;
   }
 
   void resetCodeTicks() {
     Logger.root.info('Reset all code ticks.');
     for (var i = 0; i < codes.length; i++) {
       codes[i].resetTicks();
     }
   }
 
   void updateCoverage(List coverages) {
     for (var coverage in coverages) {
       var id = coverage['script']['id'];
       var script = scripts[id];
       if (script == null) {
         script = new Script.fromMap(coverage['script']);
         scripts[id] = script;
       }
       assert(script != null);
       script._processCoverageHits(coverage['hits']);
     }
   }
 }