Add the copresence DirectiveHandler.

components/copresence/proto/rpcs.proto

+syntax = "proto2";
+package copresence;
+option optimize_for = LITE_RUNTIME;
+import "codes.proto";
+import "enums.proto";
+import "data.proto";
+message RequestHeader {
+  optional DeviceRegistration device_id = 3 [deprecated = true];
+  optional ClientVersion client_version = 4;
+  optional ClientVersion framework_version = 5;
+  optional int64 current_time_millis = 6;
+  optional string registered_device_id = 7;
+  repeated string experiment_override = 8;
+  optional string configuration_etag = 11;
+  extensions 9 to 9;
+}
+message ResponseHeader {
+  optional ErrorType error_type = 1 [deprecated = true];
+  optional DebugInfo debug_info = 2;
+  optional Status status = 3;
+}
+message RegisterDeviceRequest {
+  optional RequestHeader header = 1;
+  optional DeviceRegistration old_registration = 2 [deprecated = true];
+  optional DeviceRegistration new_registration = 3 [deprecated = true];
+  optional PushServiceRegistration push_service = 5;
+  optional DeviceIdentifiers device_identifiers = 6;
+}
+message RegisterDeviceResponse {
+  optional ResponseHeader header = 1;
+  optional string registered_device_id = 2;
+}
+message ReportRequest {
+  optional RequestHeader header = 1;
+  optional ManageMessagesRequest manage_messages_request = 2;
+  optional ManageSubscriptionsRequest manage_subscriptions_request = 3;
+  optional UpdateSignalsRequest update_signals_request = 4;
+}
+message UpdateSignalsRequest {
+  repeated TokenObservation token_observation = 1;
+  optional DeviceState state = 3;
+}
+message ManageMessagesRequest {
+  repeated PublishedMessage message_to_publish = 1;
+  repeated string id_to_unpublish = 2;
+  optional DeleteAll delete_all = 3;
+}
+message ManageSubscriptionsRequest {
+  repeated Subscription subscription = 1;
+  repeated string id_to_unsubscribe = 2;
+  optional DeleteAll delete_all = 3;
+}
+message ReportResponse {
+  optional ResponseHeader header = 1;
+  optional ManageMessagesResponse manage_messages_response = 2;
+  optional ManageSubscriptionsResponse manage_subscriptions_response = 3;
+  optional UpdateSignalsResponse update_signals_response = 4;
+}
+message UpdateSignalsResponse {
+  optional util.error.Code status = 1;
+  repeated Token token = 2;
+  repeated SubscribedMessage message = 3;
+  repeated Directive directive = 4;
+}
+message ManageMessagesResponse {
+  optional util.error.Code status = 1;
+  repeated MessageResult published_message_result = 3;
+  extensions 2 to 2;
+}
+message ManageSubscriptionsResponse {
+  optional util.error.Code status = 1;
+  repeated SubscriptionResult subscription_result = 3;
+  extensions 2 to 2;
+}