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Adds material-refresh to top-chrome-md under chrome://flags for
upcoming Material style changes.

Bug: chromium:822040

Change-Id: Ibc5ce5ead8462a56f04b80b637406d5726665c09
Reviewed-on: https://chromium-review.googlesource.com/961275
Commit-Queue: Peter Boström <pbos@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543815}