Refactor MessageCenterSettingsController.

chrome/browser/notifications/notifier_source.h

+// Copyright (c) 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_NOTIFICATIONS_NOTIFIER_SOURCE_H_
+#define CHROME_BROWSER_NOTIFICATIONS_NOTIFIER_SOURCE_H_
+
+#include <memory>
+#include <vector>
+
+#include "base/macros.h"
+#include "ui/message_center/notifier_settings.h"
+
+class Profile;
+
+namespace message_center {
+struct Notifier;
+class NotifierSettingsObserver;
+}
+
+class NotifierSource {
+ public:
+  class Observer {
+   public:
+    virtual void OnIconImageUpdated(const message_center::NotifierId& id,
+                                    const gfx::Image& image) = 0;
+    virtual void OnNotifierEnabledChanged(const message_center::NotifierId& id,
+                                          bool enabled) = 0;
+  };
+
+  NotifierSource() = default;
+  virtual ~NotifierSource() = default;
+
+  // Returns notifiers.
+  // If the source starts loading for icon images, it needs to call
+  // Observer::OnIconImageUpdated after the icon is loaded.
+  virtual std::vector<std::unique_ptr<message_center::Notifier>>
+  GetNotifierList(Profile* profile) = 0;
+
+  // Set notifier enabled. |notifier| must have notifier type that can be
+  // handled by the source. It has responsibility to invoke
+  // Observer::OnNotifierEnabledChanged.
+  virtual void SetNotifierEnabled(Profile* profile,
+                                  const message_center::Notifier& notifier,
+                                  bool enabled) = 0;
+
+  // Release temporary resouces tagged with notifier list that is returned last
+  // time.
+  virtual void OnNotifierSettingsClosing() {}
+
+  // Notifier type provided by the source.
+  virtual message_center::NotifierId::NotifierType GetNotifierType() = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NotifierSource);
+};
+
+#endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFIER_SOURCE_H_