Background service worker push message processing

chrome/browser/push_messaging/background_budget_service.h

+// Copyright 2016 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 CHROME_BROWSER_PUSH_MESSAGING_BACKGROUND_BUDGET_SERVICE_H_
+#define CHROME_BROWSER_PUSH_MESSAGING_BACKGROUND_BUDGET_SERVICE_H_
+
+#include <string>
+
+#include "base/callback_forward.h"
+#include "components/keyed_service/core/keyed_service.h"
+#include "url/gurl.h"
+
+class Profile;
+
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
+namespace chrome {
+
+// A budget service to help chrome decide how much background work a service
+// worker should be able to do on behalf of the user. The budget will be derived
+// from the Site engagement score for each domain, but in the initial
+// implementation it is just using the old grace period logic.
+// TODO(harkness) do I need a CHROME_EXPORT?
+class BackgroundBudgetService : public KeyedService {
+ public:
+  BackgroundBudgetService() {}
+  ~BackgroundBudgetService() override {}
+
+  void Shutdown() override {}
+
+  using BudgetCallback = base::Callback<void(bool success)>;
+
+  using StringCallback = base::Callback<void(const std::string& data)>;
+
+  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+  static void GetBudget(Profile* profile,
+                        int64_t service_worker_registration_id,
+                        const StringCallback& callback);
+
+  static void StoreBudget(Profile* profile,
+                          int64_t service_worker_registration_id,
+                          const GURL& origin,
+                          const std::string& notifications_shown,
+                          const BudgetCallback& callback);
+};
+
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_PUSH_MESSAGING_BACKGROUND_BUDGET_SERVICE_H_