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This change adds abstraction for the Windows APIs that
are used create and manage GCPW extension.

Bug: 1101590
Change-Id: I5fb88a6f73cc4c85f42728b9dee487d1067b8bc9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2278651
Commit-Queue: Yusuf Sengul <yusufsn@google.com>
Reviewed-by: Rakesh Soma <rakeshsoma@google.com>
Cr-Commit-Position: refs/heads/master@{#791507}