EDK: Add Dispatcher::SupportsEntrypointClass().

mojo/edk/system/message_pipe_dispatcher.cc

Index: mojo/edk/system/message_pipe_dispatcher.cc
diff --git a/mojo/edk/system/message_pipe_dispatcher.cc b/mojo/edk/system/message_pipe_dispatcher.cc
index 7028cbedd97d9bc59ac2dbfe443be35c1440e3f4..005b0948e740a0dd356c34fcb2fe44e922e9d09a 100644
--- a/mojo/edk/system/message_pipe_dispatcher.cc
+++ b/mojo/edk/system/message_pipe_dispatcher.cc
@@ -71,6 +71,11 @@ Dispatcher::Type MessagePipeDispatcher::GetType() const {
   return Type::MESSAGE_PIPE;
 }
 
+bool MessagePipeDispatcher::SupportsEntrypointClass(
+    EntrypointClass entrypoint_class) const {
+  return (entrypoint_class == EntrypointClass::MESSAGE_PIPE);
+}
+
 // static
 RefPtr<MessagePipeDispatcher> MessagePipeDispatcher::CreateRemoteMessagePipe(
     RefPtr<ChannelEndpoint>* channel_endpoint) {