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This patch modifies watchlists to include files with dark_mode anywhere
in the filename and to include dark_mode files from cc/*.

Bug: None
Change-Id: I99ac814e4e79bd1a4ad1cadf380d20c677cfae85
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2472677Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Prashant Nevase <prashant.n@samsung.com>
Cr-Commit-Position: refs/heads/master@{#817121}