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This CL provides basic logic presuming we have network connection during
the installation. Network handling will be done in a following CL.

Bug: 1015383,1006230
Change-Id: Id60b480fd5fdce04a61fdd7c226424e204f18882
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879451
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713414}