Give the BackgroundFetchJobController a simple state.

content/browser/background_fetch/background_fetch_job_controller.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.
 
 #ifndef CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_JOB_CONTROLLER_H_
 #define CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_JOB_CONTROLLER_H_
 
 #include <memory>
 #include <string>
 #include <unordered_map>
@@ skipping 12 matching lines @@
 class BackgroundFetchRequestInfo;
 class BrowserContext;
 class StoragePartition;
 
 // The JobController will be responsible for coordinating communication with the
 // DownloadManager. It will get requests from the DataManager and dispatch them
 // to the DownloadManager. It lives entirely on the IO thread.
 class CONTENT_EXPORT BackgroundFetchJobController
     : public DownloadItem::Observer {
  public:
+  enum class State { INITIALIZED, FETCHING, ABORTED, COMPLETED };
+
   using CompletedCallback =
-      base::OnceCallback<void(const BackgroundFetchRegistrationId&,
-                              bool /* aborted_by_developer */)>;
+      base::OnceCallback<void(BackgroundFetchJobController*)>;
 
   BackgroundFetchJobController(
       const BackgroundFetchRegistrationId& registration_id,
       const BackgroundFetchOptions& options,
       BrowserContext* browser_context,
       StoragePartition* storage_partition,
       BackgroundFetchDataManager* data_manager,
       CompletedCallback completed_callback);
   ~BackgroundFetchJobController() override;
 
   // Start processing on a batch of requests. Some of these may already be in
   // progress or completed from a previous chromium instance.
   void StartProcessing();
 
   // Updates the representation of this Background Fetch in the user interface
   // to match the given |title|.
   void UpdateUI(const std::string& title);
 
   // Immediately aborts this Background Fetch by request of the developer.
   void Abort();
 
   // Called by the BackgroundFetchContext when the system is shutting down.
   void Shutdown();
 
+  // Returns the current state of this Job Controller.
+  State state() const { return state_; }
+
   // Returns the registration id for which this job is fetching data.
   const BackgroundFetchRegistrationId& registration_id() const {
     return registration_id_;
   }
 
   // Returns the options with which this job is fetching data.
   const BackgroundFetchOptions& options() const { return options_; }
 
  private:
   // DownloadItem::Observer methods.
   void OnDownloadUpdated(DownloadItem* item) override;
   void OnDownloadDestroyed(DownloadItem* item) override;
 
   // Callback passed to the DownloadManager which will be invoked once the
   // download starts.
   void DownloadStarted(const std::string& request_guid,
                        DownloadItem* item,
                        DownloadInterruptReason reason);
 
   void ProcessRequest(const BackgroundFetchRequestInfo& request);
 
   // The registration id on behalf of which this controller is fetching data.
   BackgroundFetchRegistrationId registration_id_;
 
   // Options for the represented background fetch registration.
   BackgroundFetchOptions options_;
 
+  // The current state of this Job Controller.
+  State state_ = State::INITIALIZED;
+
   // TODO(peter): Deprecated, remove in favor of |registration_id|.
   std::string job_guid_;
 
   // Pointer to the browser context. The BackgroundFetchJobController is owned
   // by the BrowserContext via the StoragePartition.
   // TODO(harkness): Currently this is only used to lookup the DownloadManager.
   // Investigate whether the DownloadManager should be passed instead.
   BrowserContext* browser_context_;
 
   // Pointer to the storage partition. This object is owned by the partition
@@ skipping 11 matching lines @@
   std::unordered_map<std::string, std::string> download_guid_map_;
 
   base::WeakPtrFactory<BackgroundFetchJobController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundFetchJobController);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BACKGROUND_FETCH_BACKGROUND_FETCH_JOB_CONTROLLER_H_