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

mojo/edk/system/awakable.h

Index: mojo/edk/system/awakable.h
diff --git a/third_party/mojo/src/mojo/edk/system/awakable.h b/mojo/edk/system/awakable.h
similarity index 96%
copy from third_party/mojo/src/mojo/edk/system/awakable.h
copy to mojo/edk/system/awakable.h
index 057d3ebf4f84d2405e000032e6815f03110c7821..2cb10f5835c5a7b8c13d0ab568a90947b555db4d 100644
--- a/third_party/mojo/src/mojo/edk/system/awakable.h
+++ b/mojo/edk/system/awakable.h
@@ -11,7 +11,7 @@
 #include "mojo/public/c/system/types.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 
 // An interface that may be waited on |AwakableList|.
 class MOJO_SYSTEM_IMPL_EXPORT Awakable {
@@ -28,7 +28,7 @@ class MOJO_SYSTEM_IMPL_EXPORT Awakable {
   Awakable() {}
 };
 
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_AWAKABLE_H_