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

mojo/edk/js/tests/sample_service_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.
 
 define([
     "console",
     "mojo/edk/js/test/hexdump",
     "gin/test/expect",
     "mojo/public/interfaces/bindings/tests/sample_service.mojom",
     "mojo/public/interfaces/bindings/tests/sample_import.mojom",
@@ skipping 151 matching lines @@
   checkDefaultValues();
 
   var foo = makeFoo();
   checkFoo(foo);
 
   var pipe = core.createMessagePipe();
   serviceProxy.frobinate(foo, sample.Service.BazOptions.EXTRA, pipe.handle0);
   expect(core.close(pipe.handle0)).toBe(core.RESULT_OK);
   expect(core.close(pipe.handle1)).toBe(core.RESULT_OK);
 });