Decouple filter selection from channel construction

Allow plugins to extend the set of filters used by gRPC core:
- plugins at construction time can register against the 'channel_init' system to be allowed to mutate a new channel_stack_builder type
- channel_stack_builder provides a central and rather dynamic place to construct the list of filters required by a channel stack
- ultimately we construct the channel stack in the fashion we always have

This is also a prerequisite step to allowing filters to be implemented from wrapped languages.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/core/surface/init.h b/src/core/surface/init.h
index 771c30f412..f921fc863d 100644
--- a/src/core/surface/init.h
+++ b/src/core/surface/init.h
@@ -34,6 +34,7 @@
 #ifndef GRPC_INTERNAL_CORE_SURFACE_INIT_H
 #define GRPC_INTERNAL_CORE_SURFACE_INIT_H
 
+void grpc_register_security_filters(void);
 void grpc_security_pre_init(void);
 int grpc_is_initialized(void);