Currently we have a separate set of layout tests for Web Share in Chromium that duplicate the functionality of the WPT manual tests, only they are automated and not browser-portable (because they use a Chrome-specific hack to bypass user gesture detection, and a mock Mojo interface).

We could instead move this functionality into wpt-automation. It would still be Chromium-specific but it would re-use the upstream WPT manual tests instead of having a duplicate copy in Chrome.