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

mojo/edk/embedder/platform_shared_buffer.h

Index: mojo/edk/embedder/platform_shared_buffer.h
diff --git a/third_party/mojo/src/mojo/edk/embedder/platform_shared_buffer.h b/mojo/edk/embedder/platform_shared_buffer.h
similarity index 98%
copy from third_party/mojo/src/mojo/edk/embedder/platform_shared_buffer.h
copy to mojo/edk/embedder/platform_shared_buffer.h
index 61b372916aeca6f452762884e97269f619fd00e2..c7256afc71b9087c65bc31e3df9848ee113ffb53 100644
--- a/third_party/mojo/src/mojo/edk/embedder/platform_shared_buffer.h
+++ b/mojo/edk/embedder/platform_shared_buffer.h
@@ -14,7 +14,7 @@
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
-namespace embedder {
+namespace edk {
 
 class PlatformSharedBufferMapping;
 
@@ -96,7 +96,7 @@ class MOJO_SYSTEM_IMPL_EXPORT PlatformSharedBufferMapping {
   MOJO_DISALLOW_COPY_AND_ASSIGN(PlatformSharedBufferMapping);
 };
 
-}  // namespace embedder
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_EMBEDDER_PLATFORM_SHARED_BUFFER_H_