Debugging for https://crbug.com/601435.

mojo/public/js/connector.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 define("mojo/public/js/connector", [
   "mojo/public/js/buffer",
   "mojo/public/js/codec",
   "mojo/public/js/core",
   "mojo/public/js/support",
 ], function(buffer, codec, core, support) {
 
+  // Putting the handles somewhere causes them to not get lost.
+  var allHandles = [];
+
   function Connector(handle) {
     if (!core.isHandle(handle))
       throw new Error("Connector: not a handle " + handle);
     this.handle_ = handle;
     this.dropWrites_ = false;
     this.error_ = false;
     this.incomingReceiver_ = null;
     this.readWatcher_ = null;
     this.errorHandler_ = null;
 
@@ skipping 15 matching lines @@
     }
   };
 
   Connector.prototype.accept = function(message) {
     if (this.error_)
       return false;
 
     if (this.dropWrites_)
       return true;
 
+    allHandles = allHandles.concat(message.handles);
     var result = core.writeMessage(this.handle_,
                                    new Uint8Array(message.buffer.arrayBuffer),
                                    message.handles,
                                    core.WRITE_MESSAGE_FLAG_NONE);
     switch (result) {
       case core.RESULT_OK:
         // The handles were successfully transferred, so we don't own them
         // anymore.
         message.handles = [];
         break;
@@ skipping 60 matching lines @@
     var wait = core.wait(this.handle_, core.HANDLE_SIGNAL_READABLE,
                          core.DEADLINE_INDEFINITE);
     this.readMore_(wait.result);
   }
 
   var exports = {};
   exports.Connector = Connector;
   exports.TestConnector = TestConnector;
   return exports;
 });