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 "url/gurl.h"
+
+class Profile;
+
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
+// 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 currently
+// implements a grace period of 1 non-visual notification in 10.
+class BackgroundBudgetService {
+ public:
+  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+
+  // Get the budget associated with the origin. This currently tracks a string
+  // which holds 0 and 1 for the last 10 push messages and whether they
+  // triggered a visual notification.
+  static std::string GetBudget(Profile* profile, const GURL& origin);
+
+  // Store the budget associated with the origin. notifications_shown is
+  // expected to be a string encoding whether the last 10 push messages
+  // triggered
+  // a visual notification.
+  static void StoreBudget(Profile* profile,
+                          const GURL& origin,
+                          const std::string& notifications_shown);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(BackgroundBudgetService);
+};
+
+#endif  // CHROME_BROWSER_PUSH_MESSAGING_BACKGROUND_BUDGET_SERVICE_H_