Move message_center::CustomNotificationView to arc::ArcNotificationView

ui/arc/notification/arc_notification_content_view_delegate.h

+// Copyright 2017 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 UI_ARC_NOTIFICATION_ARC_NOTIFICATION_CONTENT_VIEW_DELEGATE_H_
+#define UI_ARC_NOTIFICATION_ARC_NOTIFICATION_CONTENT_VIEW_DELEGATE_H_
+
+namespace arc {
+
+// Delegate for a view that is hosted by CustomNotificationView.
+// TODO(yoshiki): Remove this delegate and call code in the content view
+// directly without delegate.
+class ArcNotificationContentViewDelegate {
+ public:
+  virtual bool IsCloseButtonFocused() const = 0;
+  virtual void RequestFocusOnCloseButton() = 0;
+  virtual void UpdateControlButtonsVisibility() = 0;
+  virtual void OnSlideChanged() = 0;
+};
+
+}  // namespace arc
+
+#endif  // UI_ARC_NOTIFICATION_ARC_NOTIFICATION_CONTENT_VIEW_DELEGATE_H_