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We want to restrict certain behavior (such as network reporting) to
auto-launched kiosk apps. This change updates KioskAppManager to track
whether a given app was auto-launched (which is different from whether a
given app is *currently* set to auto-launch, because policies can change
while an app is running).

BUG=452968

Review URL: https://codereview.chromium.org/900553006

Cr-Commit-Position: refs/heads/master@{#315110}