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

mojo/edk/embedder/platform_handle_utils_posix.cc

Index: mojo/edk/embedder/platform_handle_utils_posix.cc
diff --git a/third_party/mojo/src/mojo/edk/embedder/platform_handle_utils_posix.cc b/mojo/edk/embedder/platform_handle_utils_posix.cc
similarity index 93%
copy from third_party/mojo/src/mojo/edk/embedder/platform_handle_utils_posix.cc
copy to mojo/edk/embedder/platform_handle_utils_posix.cc
index b3be93faa690f3ce8d1d38c16664738b973c3a86..1f6ecce9d09165330472b23f4fc4092d11e8f5b6 100644
--- a/third_party/mojo/src/mojo/edk/embedder/platform_handle_utils_posix.cc
+++ b/mojo/edk/embedder/platform_handle_utils_posix.cc
@@ -9,7 +9,7 @@
 #include "base/logging.h"
 
 namespace mojo {
-namespace embedder {
+namespace edk {
 
 ScopedPlatformHandle DuplicatePlatformHandle(PlatformHandle platform_handle) {
   DCHECK(platform_handle.is_valid());
@@ -18,5 +18,5 @@ ScopedPlatformHandle DuplicatePlatformHandle(PlatformHandle platform_handle) {
   return ScopedPlatformHandle(PlatformHandle(dup(platform_handle.fd)));
 }
 
-}  // namespace embedder
+}  // namespace edk
 }  // namespace mojo