Screenshot: append app name to filename

Author: ezio84 <brabus84@gmail.com>
Date:   Tue Dec 19 14:37:35 2017 +0100

    Screenshot: append app name to filename

    Kang Samsung's idea.

    Change-Id: Ibc6a52b5e2597e6014a2da6a4211febe17ec02c7

Author: Wang Han <wanghan1995315@gmail.com>
Date:   Fri May 11 12:47:40 2018 +0200

    SystemUI: Don't append app name to file on lockscreen

    When device is locked, current implementation will append the current
    app name to file when taking screenshot. This causes information leaks.

    To prevent this, we check for isKeyGuardLocked() and fall back not to
    append the app name when taking screenshot on lockscreen.

    Change-Id: I04498faf51986e1a3723a32befd97d29e1f3fe58

Change-Id: Ic2a42536bf763a0c6f7fb9ac4bbbe84f73723f91