public CarExtender setUnreadConversation(UnreadConversation unreadConversation) {
            mUnreadConversation = unreadConversation;
            return this;
        }
Sets the unread conversation in a message notification.

@param unreadConversation The unread part of the conversation this notification conveys.
@return This object for method chaining.
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/compat/NotificationCompat.java