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

mojo/edk/system/simple_dispatcher.cc

Index: mojo/edk/system/simple_dispatcher.cc
diff --git a/third_party/mojo/src/mojo/edk/system/simple_dispatcher.cc b/mojo/edk/system/simple_dispatcher.cc
similarity index 90%
copy from third_party/mojo/src/mojo/edk/system/simple_dispatcher.cc
copy to mojo/edk/system/simple_dispatcher.cc
index 7264a1219d596dcfbaccc861eed3c261f7dbcf6f..447fe2e1b7fee88b9944ff2dad2f339ed4c0c227 100644
--- a/third_party/mojo/src/mojo/edk/system/simple_dispatcher.cc
+++ b/mojo/edk/system/simple_dispatcher.cc
@@ -7,7 +7,7 @@
 #include "base/logging.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 
 SimpleDispatcher::SimpleDispatcher() {
 }
@@ -16,12 +16,12 @@ SimpleDispatcher::~SimpleDispatcher() {
 }
 
 void SimpleDispatcher::HandleSignalsStateChangedNoLock() {
-  mutex().AssertHeld();
+  lock().AssertAcquired();
   awakable_list_.AwakeForStateChange(GetHandleSignalsStateImplNoLock());
 }
 
 void SimpleDispatcher::CancelAllAwakablesNoLock() {
-  mutex().AssertHeld();
+  lock().AssertAcquired();
   awakable_list_.CancelAll();
 }
 
@@ -30,7 +30,7 @@ MojoResult SimpleDispatcher::AddAwakableImplNoLock(
     MojoHandleSignals signals,
     uint32_t context,
     HandleSignalsState* signals_state) {
-  mutex().AssertHeld();
+  lock().AssertAcquired();
 
   HandleSignalsState state(GetHandleSignalsStateImplNoLock());
   if (state.satisfies(signals)) {
@@ -51,11 +51,11 @@ MojoResult SimpleDispatcher::AddAwakableImplNoLock(
 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