If the runner impl is gone (since it is a weakreference), we
still need to complete the animation contract by calling the
finish callback, so do that.
Bug: 183993924
Test: atest ActivityMetricsLoggerTests
Change-Id: Idce1859f0417cb74bbb9884e0d06750539e4545e
The change is disabled by default. To enable remote animation, one needs
to set a property and to restart the WMS.
% adb root
% adb shell setprop persist.wm.enable_remote_keyguard_animation 1
% adb reboot
Test: Existing tests pass.
Bug: 175686676
Bug: 179122467
Exempt-From-Owner-Approval: The owner already gave +2 on the exactly same CL.
Change-Id: I3054ce4bbb296f09ab8bc12595f2ad17b32db7b4