Bug 1650797 [wpt PR 24458] - Portals: Support default click-to-activate., a=testonly

Bug 1650797 [wpt PR 24458] - Portals: Support default click-to-activate., a=testonly

Automatic update from web-platform-tests
Portals: Support default click-to-activate.

This adds a default behavior whereby clicking (or equivalent) will cause
the portal to immediately activate, unless the click or DOMActivate
event has preventDefault called by a listener.

This is guarded by a new runtime enabled feature so that this does not
affect the behavior in the current origin trial.

Bug: 1102081
Change-Id: I6a6c2409b0123f95d5068c54a423ac2f29e3e968
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2281308
Reviewed-by: Adithya Srinivasan <adithyas@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785812}

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wpt-commits: 03d89c92bba52de611854f29373ba2c062ea0729
wpt-pr: 24458