GitLab

Adding a class to represent the Windows DataTransferManager APIs within
tests, as well as basic unit tests to validate the test class behaviors.

Bug: 1035527
Change-Id: Id0fcc1c1f98abfa74648e459dc420ca9aad4fecf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392443Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Hoch Hochkeppel <mhochk@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#804588}