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

mojo/edk/embedder/simple_platform_support.h

Index: mojo/edk/embedder/simple_platform_support.h
diff --git a/third_party/mojo/src/mojo/edk/embedder/simple_platform_support.h b/mojo/edk/embedder/simple_platform_support.h
similarity index 96%
copy from third_party/mojo/src/mojo/edk/embedder/simple_platform_support.h
copy to mojo/edk/embedder/simple_platform_support.h
index f06ae081eb90cfa329f6d7f34da89343ece2b6f0..ef97d91dd4983aeb5421c638e6424c4c1fac362b 100644
--- a/third_party/mojo/src/mojo/edk/embedder/simple_platform_support.h
+++ b/mojo/edk/embedder/simple_platform_support.h
@@ -10,7 +10,7 @@
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
-namespace embedder {
+namespace edk {
 
 // A simple implementation of |PlatformSupport|, when sandboxing and
 // multiprocess support are not issues (e.g., in most tests). Note: This class
@@ -33,7 +33,7 @@ class MOJO_SYSTEM_IMPL_EXPORT SimplePlatformSupport final
   MOJO_DISALLOW_COPY_AND_ASSIGN(SimplePlatformSupport);
 };
 
-}  // namespace embedder
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_EMBEDDER_SIMPLE_PLATFORM_SUPPORT_H_