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

mojo/edk/embedder/platform_support.h

Index: mojo/edk/embedder/platform_support.h
diff --git a/third_party/mojo/src/mojo/edk/embedder/platform_support.h b/mojo/edk/embedder/platform_support.h
similarity index 70%
copy from third_party/mojo/src/mojo/edk/embedder/platform_support.h
copy to mojo/edk/embedder/platform_support.h
index fb8259bc21d900cf3616b39509563ecef8b5ae28..160ba79b320425d124aea338e684a9470ea73568 100644
--- a/third_party/mojo/src/mojo/edk/embedder/platform_support.h
+++ b/mojo/edk/embedder/platform_support.h
@@ -2,17 +2,17 @@
 // 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_SUPPORT_H_
-#define THIRD_PARTY_MOJO_SRC_MOJO_EDK_EMBEDDER_PLATFORM_SUPPORT_H_
+#ifndef MOJO_EDK_EMBEDDER_PLATFORM_SUPPORT_H_
+#define MOJO_EDK_EMBEDDER_PLATFORM_SUPPORT_H_
 
 #include <stddef.h>
 
+#include "mojo/edk/embedder/scoped_platform_handle.h"
+#include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/cpp/system/macros.h"
-#include "third_party/mojo/src/mojo/edk/embedder/scoped_platform_handle.h"
-#include "third_party/mojo/src/mojo/edk/system/system_impl_export.h"
 
 namespace mojo {
-namespace embedder {
+namespace edk {
 
 class PlatformSharedBuffer;
 
@@ -37,7 +37,7 @@ class MOJO_SYSTEM_IMPL_EXPORT PlatformSupport {
   MOJO_DISALLOW_COPY_AND_ASSIGN(PlatformSupport);
 };
 
-}  // namespace embedder
+}  // namespace edk
 }  // namespace mojo
 
-#endif  // THIRD_PARTY_MOJO_SRC_MOJO_EDK_EMBEDDER_PLATFORM_SUPPORT_H_
+#endif  // MOJO_EDK_EMBEDDER_PLATFORM_SUPPORT_H_