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Now that all of the work on the Chromium and Dawn side to support
Windows has been complete, we need to add WebGPU to about:flags
on Windows.

Bug: 966580
Change-Id: I41d9f892be0d849c5ece1d5569f98344a7a92a1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873383Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#708405}