WIP: A couple of more ChannelMojo speedup ideas

third_party/mojo/src/mojo/edk/system/core.cc

Index: third_party/mojo/src/mojo/edk/system/core.cc
diff --git a/third_party/mojo/src/mojo/edk/system/core.cc b/third_party/mojo/src/mojo/edk/system/core.cc
index 4460088d47fde90a1d5e2905b3614df7ca36b9fb..39fa2f98ea6ed24abe5eb19b42b22e598e5f6e07 100644
--- a/third_party/mojo/src/mojo/edk/system/core.cc
+++ b/third_party/mojo/src/mojo/edk/system/core.cc
@@ -111,6 +111,14 @@ MojoResult Core::AsyncWait(MojoHandle handle,
   return rv;
 }
 
+MojoResult Core::SetAsyncMessageCallback(
+    MojoHandle handle,
+    base::Callback<bool(const void*, uint32_t)> callback) {
+  scoped_refptr<Dispatcher> dispatcher = GetDispatcher(handle);
+  DCHECK(dispatcher);
+  return dispatcher->SetAsyncMessageCallback(callback);
+}
+
 MojoTimeTicks Core::GetTimeTicksNow() {
   return base::TimeTicks::Now().ToInternalValue();
 }