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In order to support channel switching on the main installation of
the browser, A switch flag "--channel" that specifies which channel of
the browser is about to be installed is added to the setup's command
line. This flag will be used to store the right channel value in the
registry so the browser knows which channel is running.
The supported values are {stable|dev|beta}. This new switch will be
ignored for if any of "--chrome-beta", "--chrome-dev" and "--chrome-sxs"
is found in the command line.

Bug: 1102927
Change-Id: Ib7bd622e906f8f4af067307c90d0caffc73afc24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2172210
Commit-Queue: Yann Dago <ydago@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797688}