[CrOS Tether] Create KeepAliveScheduler, a class which schedules keep-alive tickles to be sent to a…

chromeos/components/tether/keep_alive_operation.cc

 // 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 "chromeos/components/tether/keep_alive_operation.h"
 
 #include "chromeos/components/tether/message_wrapper.h"
 #include "chromeos/components/tether/proto/tether.pb.h"
 #include "components/proximity_auth/logging/logging.h"
 
@@ skipping 30 matching lines @@
 
 KeepAliveOperation::KeepAliveOperation(
     const cryptauth::RemoteDevice& device_to_connect,
     BleConnectionManager* connection_manager)
     : MessageTransferOperation(
           std::vector<cryptauth::RemoteDevice>{device_to_connect},
           connection_manager) {}
 
 KeepAliveOperation::~KeepAliveOperation() {}
 
+void KeepAliveOperation::AddObserver(Observer* observer) {
+  observer_list_.AddObserver(observer);
+}
+
+void KeepAliveOperation::RemoveObserver(Observer* observer) {
+  observer_list_.RemoveObserver(observer);
+}
+
 void KeepAliveOperation::OnDeviceAuthenticated(
     const cryptauth::RemoteDevice& remote_device) {
   DCHECK(remote_devices().size() == 1u && remote_devices()[0] == remote_device);
 
   SendMessageToDevice(remote_device,
                       base::MakeUnique<MessageWrapper>(KeepAliveTickle()));
+  UnregisterDevice(remote_device);
+}
+
+void KeepAliveOperation::OnOperationFinished() {
+  for (auto& observer : observer_list_) {
+    observer.OnOperationFinished();
+  }
 }
 
 MessageType KeepAliveOperation::GetMessageTypeForConnection() {
   return MessageType::KEEP_ALIVE_TICKLE;
 }
 
 }  // namespace tether
 
 }  // namespace chromeos