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

mojo/edk/system/simple_dispatcher.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/simple_dispatcher.h"
 
 #include "base/logging.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 
 SimpleDispatcher::SimpleDispatcher() {
 }
 
 SimpleDispatcher::~SimpleDispatcher() {
 }
 
 void SimpleDispatcher::HandleSignalsStateChangedNoLock() {
-  mutex().AssertHeld();
+  lock().AssertAcquired();
   awakable_list_.AwakeForStateChange(GetHandleSignalsStateImplNoLock());
 }
 
 void SimpleDispatcher::CancelAllAwakablesNoLock() {
-  mutex().AssertHeld();
+  lock().AssertAcquired();
   awakable_list_.CancelAll();
 }
 
 MojoResult SimpleDispatcher::AddAwakableImplNoLock(
     Awakable* awakable,
     MojoHandleSignals signals,
     uint32_t context,
     HandleSignalsState* signals_state) {
-  mutex().AssertHeld();
+  lock().AssertAcquired();
 
   HandleSignalsState state(GetHandleSignalsStateImplNoLock());
   if (state.satisfies(signals)) {
     if (signals_state)
       *signals_state = state;
     return MOJO_RESULT_ALREADY_EXISTS;
   }
   if (!state.can_satisfy(signals)) {
     if (signals_state)
       *signals_state = state;
     return MOJO_RESULT_FAILED_PRECONDITION;
   }
 
   awakable_list_.Add(awakable, signals, context);
   return MOJO_RESULT_OK;
 }
 
 void SimpleDispatcher::RemoveAwakableImplNoLock(
     Awakable* awakable,
     HandleSignalsState* signals_state) {
-  mutex().AssertHeld();
+  lock().AssertAcquired();
   awakable_list_.Remove(awakable);
   if (signals_state)
     *signals_state = GetHandleSignalsStateImplNoLock();
 }
 
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo