Pass response to WebDriver BiDi donwnload events.

[lutien]

Pass reponse to WebDriver BiDi download events. Required for w3c/webdriver-bidi#1117.

• At least two implementers are interested (and none opposed):
  • Gecko
  • Chrome
• Tests are written and can be reviewed and commented upon at:
  The tests will be updated in the scope of https://bugzilla.mozilla.org/show_bug.cgi?id=2040936.
• Implementation bugs are filed:
  • Chromium: …
  • Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=2040936
• The top of this comment includes a clear commit message to use.

(See WHATWG Working Mode: Changes for more details.)

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/links.html ( diff )

[lutien]

@OrKoN, could you create an issue for https://github.com/GoogleChromeLabs/chromium-bidi/ to add download id, so I could link it here?