tree 7a36cfb5bcb39ef60d7454f6771ebcd393481ac1
parent 0287faf3486ab778b5abae8c626b0a96ecf33412
author Kazuki Takise <takise@google.com> 1527748339 +0900
committer Kazuki Takise <takise@google.com> 1529298631 +0900

Add always on top feature support

Add basic functionalities for always on top feature.

- Add a new flag to WindowConfiguration to represent a task wanting to
be on top.
- Update the logic on changing the z-order of windows to make sure
always on top windows are placed above other windows.

Bug: 69370884
Test: go/wm-smoke
Test: atest DisplayContentTests
Test: Used ArcCompanionLibDemo app to verify that when always-on-top is
      set, the app is above the other Android apps and Chrome windows.

Change-Id: Ie8edeb8ceeed0b9ec154b6031ed6cbe7ecc65b12