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From the header it's not obvious what Show/Hide means in terms of this
class' behaviour. This CL adds clarification as to their effect on
GetCurrentValue().

Change-Id: Ib5ebe34a687c6562442a27172b767b5d0f8fe3a7
Reviewed-on: https://chromium-review.googlesource.com/894862Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Commit-Queue: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533295}