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The required updater files are archived as an uncompressed LZMA archive
(similar to a tar file), which then is compressed using LZMA, and the
result of the compression is inserted as a binary resource into the
updater installer file.

updater.7z -> updater.packed.7z -> UpdaterSetup.exe

At the moment, the updater files are: updater.exe and uninstall.cmd.
However, in the debug component build, some other run time dependencies
are needed. The dependencies are collected at build time and archived
with the updater files.

The vast majority of this code has been lifted from
//chrome/installer/mini_installer. It is possible to further make the
code a shared library between the installer and updater projects.
This would be work for the future.


Bug: 989772
Change-Id: I9b84e8d1f4475b9977d5b7fd78f37272dd7c6212
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730309
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684210}