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This makes it easier to output debug menus. I had to change the private
property into a method because C++ things do not seem to work well with
valueForKey:

Change-Id: I62b08be230b968449a6a002a1c7e62a4c0026a03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816288Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Commit-Queue: John Wu <jzw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699223}