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These will be used to register the file extensions the PWA handles in the
Windows registry, and set up the shim app, when a PWA is installed,
once the Windows-specific code is implemented.

Bug: 960245
Change-Id: Id6142b59277c60cb72204c37f086f4df3c0ffb91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1797024
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697398}