[CrOS Tether] Add KeepAliveTickleResponse messages to both the proto file and MessageWrapper.

chromeos/components/tether/message_wrapper.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <google/protobuf/message_lite.h>
 #include <memory>
 
 #include "base/macros.h"
 #include "chromeos/components/tether/proto/tether.pb.h"
 
@@ skipping 13 matching lines @@
  public:
   // Creates a MessageWrapper from a raw string received from a remote device.
   // Returns |nullptr| if the received message is not a valid tethering message.
   static std::unique_ptr<MessageWrapper> FromRawMessage(
       const std::string& message);
 
   MessageWrapper(const ConnectTetheringRequest& request);
   MessageWrapper(const ConnectTetheringResponse& response);
   MessageWrapper(const DisconnectTetheringRequest& request);
   MessageWrapper(const KeepAliveTickle& tickle);
+  MessageWrapper(const KeepAliveTickleResponse& response);
   MessageWrapper(const TetherAvailabilityRequest& request);
   MessageWrapper(const TetherAvailabilityResponse& response);
 
   ~MessageWrapper();
 
   std::shared_ptr<google::protobuf::MessageLite> GetProto() const;
   MessageType GetMessageType() const;
 
   // To send a message to a remote device, use ToRawMessage() and send the
   // result over the wire.
   std::string ToRawMessage() const;
 
  protected:
   MessageWrapper(const MessageType& type,
                  std::shared_ptr<google::protobuf::MessageLite> proto);
 
  private:
   MessageType type_;
   std::shared_ptr<google::protobuf::MessageLite> proto_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageWrapper);
 };
 
 }  // namespace tether
 
 }  // namespace chromeos