Animate app launches from lockscreen

This CL animates the app launches (from notification, media, etc) on the
lockscreen when the lockscreen can be dismissed (i.e. when there is no
security or when SmartLock/FaceAuth is enabled).

Note that in order to try this CL, you need to enable remote keyguard
animations:

$ adb shell setprop persist.wm.enable_remote_keyguard_animation 1
$ adb reboot

See b/184726377#comment20 for before/after videos.

Bug: b/184726377
Test: Click notification/media/QS from lock screen.
Change-Id: I27e616c1549676f6d1aca53b71efc18db8eec77a