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

mojo/edk/embedder/platform_handle.cc

Index: mojo/edk/embedder/platform_handle.cc
diff --git a/third_party/mojo/src/mojo/edk/embedder/platform_handle.cc b/mojo/edk/embedder/platform_handle.cc
similarity index 86%
copy from third_party/mojo/src/mojo/edk/embedder/platform_handle.cc
copy to mojo/edk/embedder/platform_handle.cc
index 284cbb5ba3f4e2ce5348253742608eb824337e73..816c7e8c47c33dd41612490e53187fdc0ff225c0 100644
--- a/third_party/mojo/src/mojo/edk/embedder/platform_handle.cc
+++ b/mojo/edk/embedder/platform_handle.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "third_party/mojo/src/mojo/edk/embedder/platform_handle.h"
+#include "mojo/edk/embedder/platform_handle.h"
 
 #include "build/build_config.h"
 #if defined(OS_POSIX)
@@ -16,7 +16,7 @@
 #include "base/logging.h"
 
 namespace mojo {
-namespace embedder {
+namespace edk {
 
 void PlatformHandle::CloseIfNecessary() {
   if (!is_valid())
@@ -35,5 +35,5 @@ void PlatformHandle::CloseIfNecessary() {
 #endif
 }
 
-}  // namespace embedder
+}  // namespace edk
 }  // namespace mojo