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This tool is intended for developer use. It is not a production tool,
although it may be extended at some point to offer the functionality
of Omaha's ApplyTag.exe.

The script is a wrapper for certificate_tag.exe.

Since the tag format is not a simple concatenation of the magic
string start and the tag, but it requires a big-endian value be
inserted in between the strings, and certificate_tag.exe requires
the tag be provided as a hex-encoded string, then some command
wrapping is needed.

For now, the tooling assumes the tag is ASCII-encoded, but UTF-8
support can be provided later on.

To use the tool, invoke it like this:

python3 chrome\updater\tools\tag.py
--certificate_tag=out\Default\certificate_tag.exe
--in_file=out\Default\UpdaterSetup.signed.exe
--tag=appguid={8A69D345-D564-463c-AFF1-A69D9E530F96}

Bug: 1128751
Change-Id: I2dab1dfd4e7fff34c9982868625b995cff122d8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2426765Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815609}