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while on chrome:// URLs

This allows us to use this mechanism in CSS:

  @media (prefers-color-scheme: dark) {
  }

to vary styles for Chrome web UI in dark mode while also disabling via
feature on certain platforms.

This unblocks us from migrating to the @media query (from the existing
[dark] attribute syntax) and later removing a bit of JS/C++ custom code
in favor of simply using the web platform.

R=futhark@chromium.org
BUG=965811

Change-Id: I79f4582ce21661d7ba2f6a33f3f054f5ff62d0db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1626024
Auto-Submit: Dan Beam <dbeam@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667245}