[BackgroundSync] Add browser side support for SyncRegistration.done

content/browser/background_sync/background_sync_registration.h

 // Copyright 2015 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_SYNC_BACKGROUND_SYNC_REGISTRATION_H_
 #define CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_REGISTRATION_H_
 
+#include <list>
+
+#include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/background_sync/background_sync.pb.h"
 #include "content/browser/background_sync/background_sync_registration_options.h"
 #include "content/common/background_sync_service.mojom.h"
 #include "content/common/content_export.h"
 #include "third_party/mojo/src/mojo/public/cpp/bindings/type_converter.h"
 
 namespace content {
 
 class CONTENT_EXPORT BackgroundSyncRegistration {
  public:
   using RegistrationId = int64_t;
+  using StateCallback = base::Callback<void(BackgroundSyncState)>;
+
   static const RegistrationId kInitialId;
 
-  BackgroundSyncRegistration() = default;
-  ~BackgroundSyncRegistration() = default;
+  BackgroundSyncRegistration();
+  ~BackgroundSyncRegistration();
 
   bool Equals(const BackgroundSyncRegistration& other) const;
   bool IsValid() const;
+  void AddDoneCallback(const StateCallback& callback);
+  void RunDoneCallbacks();
+  bool HasCompleted() const;
 
   const BackgroundSyncRegistrationOptions* options() const { return &options_; }
   BackgroundSyncRegistrationOptions* options() { return &options_; }
 
   RegistrationId id() const { return id_; }
   void set_id(RegistrationId id) { id_ = id; }
 
   BackgroundSyncState sync_state() const { return sync_state_; }
   void set_sync_state(BackgroundSyncState state) { sync_state_ = state; }
 
  private:
   static const RegistrationId kInvalidRegistrationId;
 
   BackgroundSyncRegistrationOptions options_;
   RegistrationId id_ = kInvalidRegistrationId;
   BackgroundSyncState sync_state_ = BACKGROUND_SYNC_STATE_PENDING;
 
+  std::list<StateCallback> notify_done_callbacks_;
+
   DISALLOW_COPY_AND_ASSIGN(BackgroundSyncRegistration);
 };
 
 }  // namespace content
 
 namespace mojo {
 
 template <>
 struct CONTENT_EXPORT
     TypeConverter<scoped_ptr<content::BackgroundSyncRegistration>,
                   content::SyncRegistrationPtr> {
   static scoped_ptr<content::BackgroundSyncRegistration> Convert(
       const content::SyncRegistrationPtr& input);
 };
 
 template <>
 struct CONTENT_EXPORT TypeConverter<content::SyncRegistrationPtr,
                                     content::BackgroundSyncRegistration> {
   static content::SyncRegistrationPtr Convert(
       const content::BackgroundSyncRegistration& input);
 };
 
 }  // namespace
 
 #endif  // CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_REGISTRATION_H_