dict: more dict info exchange while handshaking.

Change-Id: I8f6466f4e57a8f1c33ec13d0eed7b09621b669ac
proto: update proto info exchange while handshaking.

Change-Id: I007e1557e813c55c7f8e2bff9e4fe7ca48b04e84
Merge "dict: more dict info exchange while handshaking."
Merge "proto: update proto info exchange while handshaking."