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Now UpdateScreen observes power changes only when it is shown.

Bug: 1124201
Change-Id: Ic67f2e3c4fc6c6fb528235d74faa2f2929c819b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2390220
Commit-Queue: Danila Kuzmin <dkuzmin@google.com>
Reviewed-by: Roman Aleksandrov <raleksandrov@google.com>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803882}