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Hooks up the basic CBCM infrastructure to Bling initialization. CBCM
is disabled by default and requires the
"--enable-chrome-browser-cloud-management" command-line switch to be
enabled.

This basic skeleton does not yet implement any of the CBCM
functionality, even when the command-line switch is set. It only creates
the iOS classes needed for CBCM to function (except the reporting
delegates, which will be added later) and hooks up their lifecycle.

This also adds a simple EG test that launches Chrome with and without
the command-line switch and makes sure the browser can still be used
to navigate, which should catch any initialization issues in both the
enabled and disabled code paths.

Bug: 1066495
Change-Id: Ic939f45cd20878981a8d407576e79252ec778ada
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2331915
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795109}