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A child label of BatteryView can change their visibility and size.
Also, EnterpriseManagedView can change its visibility.
We have to explicitly call Layout() in ChildPreferredSizeChanged() &
ChildVisibilityChanged().

TEST=manual (connect/disconnect power cable while opening the tray)
BUG=none

Change-Id: Ia1c16669bcdce0740510b7c255642d7985763225
Reviewed-on: https://chromium-review.googlesource.com/959944Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543644}