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

mojo/edk/system/waiter_test_utils.cc

 // 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.
 
 #include "mojo/edk/system/waiter_test_utils.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 namespace test {
 
 SimpleWaiterThread::SimpleWaiterThread(MojoResult* result, uint32_t* context)
     : base::SimpleThread("waiter_thread"), result_(result), context_(context) {
   waiter_.Init();
   *result_ = 5420734;    // Totally invalid result.
   *context_ = 23489023;  // "Random".
 }
 
 SimpleWaiterThread::~SimpleWaiterThread() {
@@ skipping 40 matching lines @@
                                           signals_state_out_);
   if (*result_out_ != MOJO_RESULT_OK)
     return;
 
   *did_wait_out_ = true;
   *result_out_ = waiter_.Wait(deadline_, context_out_);
   dispatcher_->RemoveAwakable(&waiter_, signals_state_out_);
 }
 
 }  // namespace test
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo