Port metrics to RPC

runtime/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';
 
 import 'package:observatory/service_common.dart';
 
 // Export the service library.
 export 'package:observatory/service_common.dart';
 
 class _HtmlWebSocket implements CommonWebSocket {
   WebSocket _webSocket;
 
   void connect(String address,
                void onOpen(),
                void onMessage(dynamic data),
                void onError(),
                void onClose()) {
     _webSocket = new WebSocket(address);
     _webSocket.onClose.listen((CloseEvent) => onClose());
     _webSocket.onError.listen((Event) => onError());
     _webSocket.onOpen.listen((Event) => onOpen());
     _webSocket.onMessage.listen((MessageEvent event) => onMessage(event.data));
   }
-  
+
   bool get isOpen => _webSocket.readyState == WebSocket.OPEN;
-  
+
   void send(dynamic data) {
     _webSocket.send(data);
   }
-  
+
   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) {
       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());
 }