[idle] Restrict the Idle Detection API to top-level frames #15731
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Allow only top-level frames to use the idle-detection feature by setting
a default Feature Policy of "self" to allow only same-origin iframes.
This check is in place to prevent third party scripts running on the
page (eg. ads) from listening to a user's idle-ness.
Bug: 936659
Change-Id: I0c83c29ec95cad25e9c35c339e46c79937654889
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1506815
Commit-Queue: Ayu Ishii <ayui@chromium.org>
Reviewed-by: Luna Lu <loonybear@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#640061}