Revert "Base: Floating window with multitasking"

This reverts commit 66c790b47eb571c3b59065595f74f85e1836659f.

Conflicts:
	core/java/android/view/IWindowManager.aidl
	services/java/com/android/server/wm/WindowManagerService.java
Revert "Revert "Floating Window: Welcome back""

This reverts commit 488cbcf505aa4c0a7e1006cf219b82f20ad56d50.
Merge branch 'kitkat_test' of https://github.com/CRXTeam/android_frameworks_base into kitkat_test