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This CL adds light mode for login shelf buttons, text, icons,
and wallpaper.

Bug: 1110757
Change-Id: I1057aa89bf777f3f35564d7876256f9381059e8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363799Reviewed-by: Yulun Wu <yulunwu@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Min Chen <minch@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Thomas Tellier <tellier@google.com>
Commit-Queue: Yulun Wu <yulunwu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803359}