Also add small test activity.
Bug: 139371701
Test: TaskOrganizerTests. TaskOrganizerMultiWindowTest.
Change-Id: I0bea25a5c8eef25fba88a0d056ef464035749a59
A first take at the TaskOrganizer API for allowing SysUI to control task presentation.
In this CL we introduce the first two primitives:
1. The interface itself for implementation by SysUI
2. Support for organizing a given windowing mode (but atm really only PIP)
We include a sample app that manages the PIP from an APPLICATION_OVERLAY window.
Bug: 139371701
Test: wmtests/TaskOrganizerTests. TaskOrganizerPipTest
Change-Id: I44a8ed311bc5f06285bba2c6ff3b37a7d19a9190
