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

mojo/edk/system/awakable_list.h

Index: mojo/edk/system/awakable_list.h
diff --git a/third_party/mojo/src/mojo/edk/system/awakable_list.h b/mojo/edk/system/awakable_list.h
similarity index 97%
copy from third_party/mojo/src/mojo/edk/system/awakable_list.h
copy to mojo/edk/system/awakable_list.h
index a34a4820887a9fc177a891366d0492e2b780fb5b..7f8a6d6e3fb42f4a23597dcca04e0f616baae333 100644
--- a/third_party/mojo/src/mojo/edk/system/awakable_list.h
+++ b/mojo/edk/system/awakable_list.h
@@ -14,7 +14,7 @@
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 
 class Awakable;
 struct HandleSignalsState;
@@ -52,7 +52,7 @@ class MOJO_SYSTEM_IMPL_EXPORT AwakableList {
   MOJO_DISALLOW_COPY_AND_ASSIGN(AwakableList);
 };
 
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_AWAKABLE_LIST_H_