Refactor MessageCenterSettingsController.

chrome/browser/notifications/notifier_source.h

Index: chrome/browser/notifications/notifier_source.h
diff --git a/chrome/browser/notifications/notifier_source.h b/chrome/browser/notifications/notifier_source.h
new file mode 100644
index 0000000000000000000000000000000000000000..aa28e219edd51acc0ffde6a870ccc4ddf7bd44ec
--- /dev/null
+++ b/chrome/browser/notifications/notifier_source.h
@@ -0,0 +1,54 @@
+// 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:
+  explicit NotifierSource(message_center::NotifierSettingsObserver* parent);
+  virtual ~NotifierSource();
+
+  // Returns notifiers.
+  // If the source starts loading for icon images, it needs to call
+  // parent_->UpdateIconImage 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
+  // parent_->NotifierEnabledChanged.
+  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;
+
+ protected:
+  // Lifetime of parent must be longer than the source.
+  message_center::NotifierSettingsObserver* const parent_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NotifierSource);
+};
+
+#endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFIER_SOURCE_H_