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.
+// TODO(harkness) do I need a CHROME_EXPORT?

[Peter Beverloo, 2016/04/08 14:29:38]

Note: Personally I like using class headers as a TODO list by having a million
of them, when building a system from the ground up.

[harkness, 2016/04/11 09:37:37]

I'll consider doing that in my next patch, but it feels weird to write TODOs
here for code that's already written, just waiting for this patch to clear
before I upload it.

+class BackgroundBudgetService {
+ public:
+  BackgroundBudgetService() {}

[Peter Beverloo, 2016/04/08 14:29:38]

If you're going the all static route (we need to talk about keyed services),
please remove the non-static methods altogether and add
DISALLOW_IMPLICIT_CONSTRUCTORS() from base/macros.h.

[harkness, 2016/04/11 09:37:37]

For this patch, I'll go ahead and do that.

+  ~BackgroundBudgetService() override {}

[Peter Beverloo, 2016/04/08 14:29:38]

Note: This (and line 28) will cause a compile failure because they don't
override anything.

[harkness, 2016/04/11 09:37:37]

Done.

+
+  void Shutdown() override {}
+
+  using BudgetCallback = base::Callback<void(const std::string& data)>;
+
+  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 void GetBudget(Profile* profile,
+                        const GURL& origin,
+                        const BudgetCallback& callback);
+
+  // Store the budget associated with the origin. notifications_shown is
+  // expected to be a sting encoding whether the last 10 push messages triggered
+  // a visual notification.
+  static void StoreBudget(Profile* profile,
+                          const GURL& origin,
+                          const std::string& notifications_shown);
+};
+
+#endif  // CHROME_BROWSER_PUSH_MESSAGING_BACKGROUND_BUDGET_SERVICE_H_