Port NotificationViewMD unit tests from NotificationViewTest.

ui/message_center/views/notification_view_md.h

Index: ui/message_center/views/notification_view_md.h
diff --git a/ui/message_center/views/notification_view_md.h b/ui/message_center/views/notification_view_md.h
index 890165a9c8968acf1eb049b8f64d18071b80ab51..547d112dc5650fcc9f74de7d045a0e03a25cc83e 100644
--- a/ui/message_center/views/notification_view_md.h
+++ b/ui/message_center/views/notification_view_md.h
@@ -64,6 +64,13 @@ class MESSAGE_CENTER_EXPORT NotificationViewMD
   views::View* TargetForRect(views::View* root, const gfx::Rect& rect) override;
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(NotificationViewMDTest, CreateOrUpdateTest);
+  FRIEND_TEST_ALL_PREFIXES(NotificationViewMDTest, TestIconSizing);
+  FRIEND_TEST_ALL_PREFIXES(NotificationViewMDTest, UpdateButtonsStateTest);
+  FRIEND_TEST_ALL_PREFIXES(NotificationViewMDTest, UpdateButtonCountTest);
+
+  friend class NotificationViewMDTest;
+
   void CreateOrUpdateViews(const Notification& notification);
 
   void CreateOrUpdateContextTitleView(const Notification& notification);