[mojo-edk] Add explicit message object APIs

mojo/edk/system/core.h

Index: mojo/edk/system/core.h
diff --git a/mojo/edk/system/core.h b/mojo/edk/system/core.h
index 18da0ba375c744883f7a6e8a6ed0743517ccff36..76e768b45c8d91827fa2a2a6afae29ff2c459f22 100644
--- a/mojo/edk/system/core.h
+++ b/mojo/edk/system/core.h
@@ -144,6 +144,13 @@ class MOJO_SYSTEM_IMPL_EXPORT Core {
                    MojoWatchCallback callback,
                    uintptr_t context);
   MojoResult CancelWatch(MojoHandle handle, uintptr_t context);
+  MojoResult CreateMessage(uint32_t num_bytes,
+                           const MojoHandle* handles,
+                           uint32_t num_handles,
+                           MojoCreateMessageFlags flags,
+                           MojoMessageHandle* message);
+  MojoResult DestroyMessage(MojoMessageHandle message);
+  MojoResult GetMessageBuffer(MojoMessageHandle message, void** buffer);
 
   // These methods correspond to the API functions defined in
   // "mojo/public/c/system/wait_set.h":
@@ -171,12 +178,21 @@ class MOJO_SYSTEM_IMPL_EXPORT Core {
                           const MojoHandle* handles,
                           uint32_t num_handles,
                           MojoWriteMessageFlags flags);
+  MojoResult WriteMessageNew(MojoHandle message_pipe_handle,
+                             MojoMessageHandle message,
+                             MojoWriteMessageFlags flags);
   MojoResult ReadMessage(MojoHandle message_pipe_handle,
                          void* bytes,
                          uint32_t* num_bytes,
                          MojoHandle* handles,
                          uint32_t* num_handles,
                          MojoReadMessageFlags flags);
+  MojoResult ReadMessageNew(MojoHandle message_pipe_handle,
+                            MojoMessageHandle* message,
+                            uint32_t* num_bytes,
+                            MojoHandle* handles,
+                            uint32_t* num_handles,
+                            MojoReadMessageFlags flags);
   MojoResult FuseMessagePipes(MojoHandle handle0, MojoHandle handle1);
 
   // These methods correspond to the API functions defined in