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Changes the contrast of the separator under the password field on the
login/lock screen. When the password field receives focus, the separator
will be highlighted. When it loses focus, the highlight is removed.

TBR=xiyuan@chromium.org

Fixed: 908967
Change-Id: I8e953497586b96e8836745a8e086d3adb36edeca
Bug: 908967
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1969340
Commit-Queue: Renato Silva <rrsilva@google.com>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Auto-Submit: Renato Silva <rrsilva@google.com>
Cr-Commit-Position: refs/heads/master@{#727488}