windows: add GetShellWindow and GetWindowThreadProcessId

I am trying to implement

https://devblogs.microsoft.com/oldnewthing/20190425-00/?p=102443

so I need these functions.

Change-Id: Id5082e4cc450569ffd021f4a300d56de325e4952
Reviewed-on: https://go-review.googlesource.com/c/sys/+/280717
Trust: Alex Brainman <alex.brainman@gmail.com>
Trust: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2 files changed
tree: f4c9f0864808c2b27ccbb6e992d02c4e8e619013
  1. cpu/
  2. internal/
  3. plan9/
  4. unix/
  5. windows/
  6. .gitattributes
  7. .gitignore
  8. AUTHORS
  9. codereview.cfg
  10. CONTRIBUTING.md
  11. CONTRIBUTORS
  12. go.mod
  13. LICENSE
  14. PATENTS
  15. README.md
README.md

sys

Go Reference

This repository holds supplemental Go packages for low-level interactions with the operating system.

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