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

mojo/edk/embedder/platform_handle_utils.h

Index: mojo/edk/embedder/platform_handle_utils.h
diff --git a/third_party/mojo/src/mojo/edk/embedder/platform_handle_utils.h b/mojo/edk/embedder/platform_handle_utils.h
similarity index 96%
copy from third_party/mojo/src/mojo/edk/embedder/platform_handle_utils.h
copy to mojo/edk/embedder/platform_handle_utils.h
index b3d7a79f30a28859213fe19b3978d80d71260855..fa683e4a606e5daf1609aa0f76416cccb11c0361 100644
--- a/third_party/mojo/src/mojo/edk/embedder/platform_handle_utils.h
+++ b/mojo/edk/embedder/platform_handle_utils.h
@@ -10,7 +10,7 @@
 #include "mojo/edk/system/system_impl_export.h"
 
 namespace mojo {
-namespace embedder {
+namespace edk {
 
 // Closes all the |PlatformHandle|s in the given container.
 template <typename PlatformHandleContainer>
@@ -27,7 +27,7 @@ MOJO_SYSTEM_IMPL_EXPORT inline void CloseAllPlatformHandles(
 MOJO_SYSTEM_IMPL_EXPORT ScopedPlatformHandle
 DuplicatePlatformHandle(PlatformHandle platform_handle);
 
-}  // namespace embedder
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_EMBEDDER_PLATFORM_HANDLE_UTILS_H_