Add a Mojo EDK for Chrome that uses one OS pipe per message pipe.

mojo/edk/js/tests/connection_tests.js

 // Copyright 2013 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.
 
 // Mock out the support module to avoid depending on the message loop.
 define("mojo/public/js/support", ["timer"], function(timer) {
   var waitingCallbacks = [];
 
   function WaitCookie(id) {
     this.id = id;
@@ skipping 220 matching lines @@
     }).then(function() {
       throw Error("Expected echoString to fail.");
     }, function(error) {
       expect(error.message).toBe("Connection error: " + core.RESULT_UNKNOWN);
 
       // Clean up.
       core.readMessage = origReadMessage;
     });
   }
 });