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

mojo/edk/embedder/platform_handle_vector.h

Index: mojo/edk/embedder/platform_handle_vector.h
diff --git a/third_party/mojo/src/mojo/edk/embedder/platform_handle_vector.h b/mojo/edk/embedder/platform_handle_vector.h
similarity index 95%
copy from third_party/mojo/src/mojo/edk/embedder/platform_handle_vector.h
copy to mojo/edk/embedder/platform_handle_vector.h
index 771df4fb9d470aa7dcff2f33530bc219dace6d7e..2bea729ab243bb65fd2bb9a43af341eec83e1e66 100644
--- a/third_party/mojo/src/mojo/edk/embedder/platform_handle_vector.h
+++ b/mojo/edk/embedder/platform_handle_vector.h
@@ -13,7 +13,7 @@
 #include "mojo/edk/system/system_impl_export.h"
 
 namespace mojo {
-namespace embedder {
+namespace edk {
 
 using PlatformHandleVector = std::vector<PlatformHandle>;
 
@@ -29,7 +29,7 @@ struct MOJO_SYSTEM_IMPL_EXPORT PlatformHandleVectorDeleter {
 using ScopedPlatformHandleVectorPtr =
     scoped_ptr<PlatformHandleVector, PlatformHandleVectorDeleter>;
 
-}  // namespace embedder
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_EMBEDDER_PLATFORM_HANDLE_VECTOR_H_