Add basic support for GetChannel
diff --git a/config.m4 b/config.m4
index 8190485..da8dca7 100644
--- a/config.m4
+++ b/config.m4
@@ -89,6 +89,7 @@
     src/core/lib/channel/channel_stack.cc \
     src/core/lib/channel/channel_stack_builder.cc \
     src/core/lib/channel/channel_trace.cc \
+    src/core/lib/channel/channelz.cc \
     src/core/lib/channel/channelz_registry.cc \
     src/core/lib/channel/connected_channel.cc \
     src/core/lib/channel/handshaker.cc \