Make notifyEvent transfer transient activation.
The window.fence.notifyEvent() API should "transfer"
transient activation from the fenced frame to its embedder. To transfer
transient activation, the fenced frame consumes it and then applies it
the outer document afterwards. This ensures that the embedder can use
an activation-gated API in response to an event occurring in the
fenced frame, but that only one of those APIs can be used per event.
Change-Id: I97749cd94fe1040ae118086a6b23890bcc62ef3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5577336
Reviewed-by: danakj danakj@chromium.org
Reviewed-by: Liam Brady lbrady@google.com
Reviewed-by: Mustaq Ahmed mustaq@chromium.org
Reviewed-by: Arthur Sonzogni arthursonzogni@chromium.org
Commit-Queue: Andrew Verge averge@chromium.org
Cr-Commit-Position: refs/heads/main@{#1353940}