Support notifications with custom content

ui/message_center/views/message_view_factory.h

Index: ui/message_center/views/message_view_factory.h
diff --git a/ui/message_center/views/message_view_factory.h b/ui/message_center/views/message_view_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..9ff2251ff54db049a7b3b47fb6914b484a2b0a83
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+++ b/ui/message_center/views/message_view_factory.h
@@ -0,0 +1,30 @@
+// 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_MESSAGE_VIEW_FACTORY_H_
+#define UI_MESSAGE_CENTER_MESSAGE_VIEW_FACTORY_H_
+
+#include "ui/message_center/message_center_export.h"
+
+namespace message_center {
+
+class MessageCenterController;
+class MessageView;
+class Notification;
+
+// Creates appropriate MessageViews for notifications depending on the
+// notification type. A notification is top level if it needs to be rendered
+// outside the browser window. No custom shadows are created for top level
+// notifications on Linux with Aura.
+class MESSAGE_CENTER_EXPORT MessageViewFactory {
+ public:
+  // |controller| may be NULL, but has to be set before the view is shown.
+  static MessageView* Create(MessageCenterController* controller,
+                             const Notification& notification,
+                             bool top_level);
+};
+
+}  // namespace message_center
+
+#endif  // UI_MESSAGE_CENTER_MESSAGE_VIEW_FACTORY_H_