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

mojo/edk/js/threading.h

Index: mojo/edk/js/threading.h
diff --git a/third_party/mojo/src/mojo/edk/js/threading.h b/mojo/edk/js/threading.h
similarity index 93%
copy from third_party/mojo/src/mojo/edk/js/threading.h
copy to mojo/edk/js/threading.h
index 7cf0d532f6ddd6f7869d60123a3d9dd820585727..1a1803ddc0e58bcffca7718185777e26d027db0d 100644
--- a/third_party/mojo/src/mojo/edk/js/threading.h
+++ b/mojo/edk/js/threading.h
@@ -9,7 +9,7 @@
 #include "v8/include/v8.h"
 
 namespace mojo {
-namespace js {
+namespace edk {
 
 class Threading {
  public:
@@ -19,7 +19,7 @@ class Threading {
   Threading();
 };
 
-}  // namespace js
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_JS_THREADING_H_