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When the enable-reader-mode flag is set, users by default see
the reader mode icon in the omnibox for all articles which can
be distilled by reader mode. This adds a feature variable which
allows users to decide in chrome://settings/appearance whether
they want to be shown the reader mode icon in the omnibox
when available.

Bug: 1041589
Change-Id: I6205323ff4eccf47f8c776829525f34adda0f899
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2039336
Commit-Queue: Katie Dektar <katie@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742697}