Watchdog and sluggishness due to multiple virtual displays created by third party apps

Problem: {
            1.Install third party app which creates virtual displays on screen off like easy boost cleaner app
            2.Open easy.booster.clean.tool
            3.Press power button to lock and then unlock
            4.repeat the step 3 for 500 times or usage over the time without reboot
}

Solution: {
    1. Over the time the snapshot time taken for multiple virtual displays takes over a minutes.
    2. Avoid taking snapshot of DEFAULT_DISPLAY for virtual displays, since we have already taken snapshot for default display.
}

Bug: 288536413
Change-Id: Iad61fe589ade31c7a78820a5655986198b8ae0f8