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This CL adds skeleton code for the dark mode feature pod.

Bug: 1106012
Change-Id: Icb4046bf25fd90482a69588611445a2604c39247
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339289
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796726}