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In some variants of the simplified domain field trials, we show the
full URL on page load and elide to a simplified version of the domain
after the user interacts with the page. Originally we considered any
user interaction (as received via
WebContentsObserver::DidGetUserInteraction) a trigger for elision, but
then started ignoring mouse clicks in
https://chromium-review.googlesource.com/c/chromium/src/+/2327289, to
avoid flashing when the user clicks on links. This proved to be a bit
too coarse, since we want to at least elide the URL when the user
focuses a form text field. This CL thus elides the URL when
WebContentsObserver::OnFocusChangedInPage() reports that an editable
node has been focused.

Bug: 1104280
Change-Id: Ib0b4a5b19d035c38a2e529c6f526c421f537cff4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357074Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798261}