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

mojo/edk/embedder/platform_channel_pair.cc

Index: mojo/edk/embedder/platform_channel_pair.cc
diff --git a/third_party/mojo/src/mojo/edk/embedder/platform_channel_pair.cc b/mojo/edk/embedder/platform_channel_pair.cc
similarity index 94%
copy from third_party/mojo/src/mojo/edk/embedder/platform_channel_pair.cc
copy to mojo/edk/embedder/platform_channel_pair.cc
index 4e88bc9e08a1eebcb0173ded28e729261bff6b6f..b083df67bedf51c7f862b198019b2a4c6ec140ac 100644
--- a/third_party/mojo/src/mojo/edk/embedder/platform_channel_pair.cc
+++ b/mojo/edk/embedder/platform_channel_pair.cc
@@ -7,7 +7,7 @@
 #include "base/logging.h"
 
 namespace mojo {
-namespace embedder {
+namespace edk {
 
 const char PlatformChannelPair::kMojoPlatformChannelHandleSwitch[] =
     "mojo-platform-channel-handle";
@@ -28,5 +28,5 @@ void PlatformChannelPair::ChildProcessLaunched() {
   client_handle_.reset();
 }
 
-}  // namespace embedder
+}  // namespace edk
 }  // namespace mojo