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Add --simulate-update-hresult and --simulate-update-error-code
switches. The first switch can take the HRESULT error code value,
the second one specifies a value that corresponds to the
GoolgeUpdateErrorCode enum. With these switches, when using
VersionUpdaterWin, one can simulate errors in the about page to debug
how the UI reflects certain errors conditions.

Bug: 1066529
Change-Id: I6500b81108c69d252087ebcdb1cba0ffba86dbed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2131019
Commit-Queue: Maciek Kumorek <makumo@microsoft.com>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760218}