Adding support for pre-sent messages

components/copresence/proto/data.proto

 syntax = "proto2";
 package copresence;
 option optimize_for = LITE_RUNTIME;
 import "config_data.proto";
 import "enums.proto";
 import "identity.proto";
 message ClientVersion {
   optional string client = 1;
   optional string version_name = 2;
   optional int64 version_code = 3;
@@ skipping 93 matching lines @@
     optional string published_message_id = 1;
     optional string publisher_identity_id = 2;
     optional string publisher_device_id = 3;
     optional int64 creation_timestamp_millis = 4;
     optional int64 ttl_millis = 5;
     optional TokenExchangeStrategy token_exchange_strategy = 7;
   }
   repeated string subscription_id = 1;
   optional Message published_message = 2;
   optional Debug debug = 3;
+  repeated TokenObservation required_token = 5;
 }
 message Message {
   optional MessageType type = 2;
   optional bytes payload = 3;
 }
 message MessageType {
   optional string type = 2;
 }
 message Subscription {
   optional string id = 1;
   optional int64 ttl_millis = 3;
   optional MessageType message_type = 4;
   optional TokenExchangeStrategy token_exchange_strategy = 7;
   optional OptInStateFilter opt_in_state_filter = 8;
 }
 message MessageResult {
   optional string published_message_id = 1;
 }
 message SubscriptionResult {
   optional string subscription_id = 1;
 }
 message OptInStateFilter {
   repeated OptInState allowed_opt_in_state = 1;
 }