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

BUG=672263

Review-Url: https://codereview.chromium.org/2913363002
Cr-Commit-Position: refs/heads/master@{#476438}

chromeos/components/tether/message_wrapper.cc

@@ -47,6 +47,12 @@ std::unique_ptr<google::protobuf::MessageLite> DecodedMessageToProto(
       keep_alive_tickle->ParseFromString(decoded_message);
       return std::move(keep_alive_tickle);
     }
+    case MessageType::KEEP_ALIVE_TICKLE_RESPONSE: {
+      std::unique_ptr<KeepAliveTickleResponse> keep_alive_tickle_response =
+          base::MakeUnique<KeepAliveTickleResponse>();
+      keep_alive_tickle_response->ParseFromString(decoded_message);
+      return std::move(keep_alive_tickle_response);
+    }
     case MessageType::TETHER_AVAILABILITY_REQUEST: {
       std::unique_ptr<TetherAvailabilityRequest> tether_request =
           base::MakeUnique<TetherAvailabilityRequest>();
@@ -123,6 +129,10 @@ MessageWrapper::MessageWrapper(const KeepAliveTickle& tickle)
     : type_(MessageType::KEEP_ALIVE_TICKLE),
       proto_(new KeepAliveTickle(tickle)) {}
 
+MessageWrapper::MessageWrapper(const KeepAliveTickleResponse& response)
+    : type_(MessageType::KEEP_ALIVE_TICKLE_RESPONSE),
+      proto_(new KeepAliveTickleResponse(response)) {}
+
 MessageWrapper::MessageWrapper(const TetherAvailabilityRequest& request)
     : type_(MessageType::TETHER_AVAILABILITY_REQUEST),
       proto_(new TetherAvailabilityRequest(request)) {}

chromeos/components/tether/message_wrapper.h

@@ -31,6 +31,7 @@ class MessageWrapper {
   MessageWrapper(const ConnectTetheringResponse& response);
   MessageWrapper(const DisconnectTetheringRequest& request);
   MessageWrapper(const KeepAliveTickle& tickle);
+  MessageWrapper(const KeepAliveTickleResponse& response);
   MessageWrapper(const TetherAvailabilityRequest& request);
   MessageWrapper(const TetherAvailabilityResponse& response);
 

chromeos/components/tether/message_wrapper_unittest.cc

@@ -103,6 +103,14 @@ TEST_F(MessageWrapperTest, TestToAndFromRawMessage_KeepAliveTickle) {
   VerifyProtoConversion(&tickle, wrapper, MessageType::KEEP_ALIVE_TICKLE);
 }
 
+TEST_F(MessageWrapperTest, TestToAndFromRawMessage_KeepAliveTickleResponse) {
+  KeepAliveTickleResponse response;
+
+  MessageWrapper wrapper(response);
+  VerifyProtoConversion(&response, wrapper,
+                        MessageType::KEEP_ALIVE_TICKLE_RESPONSE);
+}
+
 TEST_F(MessageWrapperTest, TestToAndFromRawMessage_TetherAvailabilityRequest) {
   TetherAvailabilityRequest request;
 

chromeos/components/tether/proto/tether.proto

@@ -19,6 +19,7 @@ enum MessageType {
   CONNECT_TETHERING_RESPONSE = 4;
   DISCONNECT_TETHERING_REQUEST = 5;
   KEEP_ALIVE_TICKLE = 6;
+  KEEP_ALIVE_TICKLE_RESPONSE = 7;
 }
 
 // Meant to communicate the host's current Wifi status. This is intended to
@@ -103,5 +104,10 @@ message ConnectTetheringResponse {
 // Next id: 1
 message KeepAliveTickle {}
 
+// Next id: 2
+message KeepAliveTickleResponse {
+  optional DeviceStatus device_status = 1;
+}
+
 // Next id: 1
 message DisconnectTetheringRequest {}