Fix bugs in heapmap, binary payloads, 'address' request.

runtime/bin/vmservice/observatory/lib/service_html.dart

 // Copyright (c) 2014, 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 service_html;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:html';
 import 'dart:typed_data';
@@ skipping 25 matching lines @@
   }
   
   void close() {
     _webSocket.close();
   }
   
   Future<ByteData> nonStringToByteData(dynamic data) {
     assert(data is Blob);
     FileReader fileReader = new FileReader();
     fileReader.readAsArrayBuffer(data);
-    return fileReader.onLoadEnd.first.then((e)
-        => new ByteData.view(fileReader.result));
+    return fileReader.onLoadEnd.first.then((e) {
+      var result = fileReader.result;
+      return new ByteData.view(result.buffer,
+                               result.offsetInBytes,
+                               result.length);
+    });
   }
 }
 
 /// The [WebSocketVM] communicates with a Dart VM over WebSocket. The Dart VM
 /// can be embedded in Chromium or standalone. In the case of Chromium, we
 /// make the service requests via the Chrome Remote Debugging Protocol.
 class WebSocketVM extends CommonWebSocketVM {
   WebSocketVM(WebSocketVMTarget target) : super(target, new _HtmlWebSocket());
 }
 
@@ skipping 32 matching lines @@
     message['id'] = idString;
     message['method'] = 'observatoryQuery';
     message['query'] = '$path';
     _requestSerial++;
     var completer = new Completer();
     _pendingRequests[idString] = completer;
     window.parent.postMessage(JSON.encode(message), '*');
     return completer.future;
   }
 }