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

mojo/edk/embedder/scoped_platform_handle.h

Index: mojo/edk/embedder/scoped_platform_handle.h
diff --git a/third_party/mojo/src/mojo/edk/embedder/scoped_platform_handle.h b/mojo/edk/embedder/scoped_platform_handle.h
similarity index 97%
copy from third_party/mojo/src/mojo/edk/embedder/scoped_platform_handle.h
copy to mojo/edk/embedder/scoped_platform_handle.h
index aec44825667f6b90809449296dc8265cb72185db..ae75202d61961b8760fcecf04bd190e45f6f426b 100644
--- a/third_party/mojo/src/mojo/edk/embedder/scoped_platform_handle.h
+++ b/mojo/edk/embedder/scoped_platform_handle.h
@@ -11,7 +11,7 @@
 #include "mojo/public/c/system/macros.h"
 
 namespace mojo {
-namespace embedder {
+namespace edk {
 
 class MOJO_SYSTEM_IMPL_EXPORT ScopedPlatformHandle {
   MOVE_ONLY_TYPE_WITH_MOVE_CONSTRUCTOR_FOR_CPP_03(ScopedPlatformHandle)
@@ -56,7 +56,7 @@ class MOJO_SYSTEM_IMPL_EXPORT ScopedPlatformHandle {
   PlatformHandle handle_;
 };
 
-}  // namespace embedder
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_EMBEDDER_SCOPED_PLATFORM_HANDLE_H_