[PEPC] Disable PEPC after layout changed

To ensure the trust of user input signal, this CL will temporarily
disable the permission element shortly after the layout has been
modified, if the layout modification causes the position/size of the
PEPC element within the viewport to change.

The approach is outlined
https://docs.google.com/document/d/1fDJjFOCaUQJXINn6KDIvfAO3KQJWyho3NwKjWAN_YCo/edit?resourcekey=0-MQHWEtPOPc8lJb5f1Q14aA&tab=t.0

Fixed: 335250285
Bug: 1462930
Change-Id: Iaf3420677948cea3c8a02b8c80fb91bb7abd86f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5398177
Commit-Queue: Thomas Nguyen <tungnh@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Reviewed-by: Mason Freed <masonf@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1289270}