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

mojo/edk/embedder/platform_handle.h

Index: mojo/edk/embedder/platform_handle.h
diff --git a/third_party/mojo/src/mojo/edk/embedder/platform_handle.h b/mojo/edk/embedder/platform_handle.h
similarity index 73%
copy from third_party/mojo/src/mojo/edk/embedder/platform_handle.h
copy to mojo/edk/embedder/platform_handle.h
index aecc58b09ac923c436838ac31c64514603e7f9e0..91a4eec5dd1e55164e57afbfe0955685c4c86e4f 100644
--- a/third_party/mojo/src/mojo/edk/embedder/platform_handle.h
+++ b/mojo/edk/embedder/platform_handle.h
@@ -2,18 +2,18 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef THIRD_PARTY_MOJO_SRC_MOJO_EDK_EMBEDDER_PLATFORM_HANDLE_H_
-#define THIRD_PARTY_MOJO_SRC_MOJO_EDK_EMBEDDER_PLATFORM_HANDLE_H_
+#ifndef MOJO_EDK_EMBEDDER_PLATFORM_HANDLE_H_
+#define MOJO_EDK_EMBEDDER_PLATFORM_HANDLE_H_
 
 #include "build/build_config.h"
-#include "third_party/mojo/src/mojo/edk/system/system_impl_export.h"
+#include "mojo/edk/system/system_impl_export.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 namespace mojo {
-namespace embedder {
+namespace edk {
 
 #if defined(OS_POSIX)
 struct MOJO_SYSTEM_IMPL_EXPORT PlatformHandle {
@@ -41,7 +41,7 @@ struct MOJO_SYSTEM_IMPL_EXPORT PlatformHandle {
 #error "Platform not yet supported."
 #endif
 
-}  // namespace embedder
+}  // namespace edk
 }  // namespace mojo
 
-#endif  // THIRD_PARTY_MOJO_SRC_MOJO_EDK_EMBEDDER_PLATFORM_HANDLE_H_
+#endif  // MOJO_EDK_EMBEDDER_PLATFORM_HANDLE_H_