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In preparation for bringing Chrome Browser Cloud Management to iOS, this
adds a command-line switch to control whether CBCM is enabled. It needs
to be a command-line flag because policy infrastructure is initialized
before Finch / about flags and field trials.

Bug: 1066495
Change-Id: I0bd27e5ee863deda949afa64b248ca5445f9ef8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316620
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791912}