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NavigatorBase is a newly-added base class for Navigator and
WorkerNavigator. Making GPU a Supplement of NavigatorBase
allows a single class to handle all of the work of exposing the
navigator.gpu getter for both windows and workers, and
greatly reduces boilerplate.

Bug: 1147612
Change-Id: I8621639935b014eb4905804f432327729619c3d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537775
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Auto-Submit: Nate Chapin <japhet@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827480}