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Battery warning message is shown after UPDATE_AVAILABLE stage on update
screen iff the battery is DISCHARGING and is lower 50%. In this CL only
placeholder for html part is provided.

Bug: 1101783
Change-Id: I70376a668c1a905e5dbab6cda986f13029e8e71c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2285009
Commit-Queue: Danila Kuzmin <dkuzmin@google.com>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Roman Aleksandrov <raleksandrov@google.com>
Cr-Commit-Position: refs/heads/master@{#791222}