Transfer responsibility for providing a close button for a notification to each implementation of M…

ui/message_center/views/custom_notification_content_view_delegate.h

Index: ui/message_center/views/custom_notification_content_view_delegate.h
diff --git a/ui/message_center/views/custom_notification_content_view_delegate.h b/ui/message_center/views/custom_notification_content_view_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..e33dd1211f2d0c0cc14abd87974f576f73309574
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+++ b/ui/message_center/views/custom_notification_content_view_delegate.h
@@ -0,0 +1,22 @@
+// 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 UI_MESSAGE_CENTER_CUSTOM_NOTIFICATION_CONTENT_VIEW_DELEGATE_H_
+#define UI_MESSAGE_CENTER_CUSTOM_NOTIFICATION_CONTENT_VIEW_DELEGATE_H_
+
+#include "ui/message_center/message_center_export.h"
+
+namespace message_center {
+
+// Delegate for a view that is hosted by CustomNotificationView.
+class MESSAGE_CENTER_EXPORT CustomNotificationContentViewDelegate {
+ public:
+  virtual bool IsCloseButtonFocused() const = 0;
+  virtual void RequestFocusOnCloseButton() = 0;
+  virtual bool IsPinned() const = 0;
+};
+
+}  // namespace message_center
+
+#endif  // UI_MESSAGE_CENTER_CUSTOM_NOTIFICATION_CONTENT_VIEW_DELEGATE_H_