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

mojo/edk/system/waiter.cc

Index: mojo/edk/system/waiter.cc
diff --git a/third_party/mojo/src/mojo/edk/system/waiter.cc b/mojo/edk/system/waiter.cc
similarity index 98%
copy from third_party/mojo/src/mojo/edk/system/waiter.cc
copy to mojo/edk/system/waiter.cc
index f18edc8e815bcbff67d5b906e24f28f09d669743..1a9c0b1604945ca776c8daae2cf4cb271bf28b49 100644
--- a/third_party/mojo/src/mojo/edk/system/waiter.cc
+++ b/mojo/edk/system/waiter.cc
@@ -10,7 +10,7 @@
 #include "base/time/time.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 
 Waiter::Waiter()
     : cv_(&lock_),
@@ -96,5 +96,5 @@ bool Waiter::Awake(MojoResult result, uintptr_t context) {
   return true;
 }
 
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo