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This change adds the following four fields to feedback reports on
Windows following an on-demand update check (and to chrome://system):

- update_error_code: An int value in the GoogleUpdateErrorCode enum.
- install_location: One of ("per-machine", "per-user", "unknown")
  indicating whether the browser is installed somewhere in the ordinary
  "all users" system location (e.g., "C:\Program Files (x86)\..."), the
  ordinary user-specific location (e.g.,
  "C:\Users\USER\AppData\Local\..."), or some other unexpected location.
- update_hresult: A Windows HRESULT (hex), provided by Google Update or
  COM, in case of error.
- install_result_code: An int process exit code from the installer in
  case of error if the installer was executed.

This is made possible by the introduction of UpdateState, which holds
all state relating to an update check, and GetLastUpdateState(), which
returns said state pertaining to the most recently completed update
check.

In support of this change, the Google Update update checker now uses
base::Opional<int> (rather than a magic value of -1) for the installer
process exit code to differentiate "none provided" from any specific
value.

Bug: 985209

Change-Id: Id49c65e40c0359aed767e0404afbf07030c20e07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1798345
Commit-Queue: Greg Thompson <grt@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699243}