tree a35faf0bb373a70d81ce7fd4dbf74ecd8e874351
parent 943fe3d99db173c678473cdb72c571287386e865
author Chilun <chilunhuang@google.com> 1641975283 +0800
committer Tony Huang <tonyychuang@google.com> 1642839114 +0800

Clean up the legacy split screen (3/n)

Clean up legacy split screen related code from TaskFragment and
WindowState.

Bug: 199236198
Test: atest TaskFragmentTest
      atest WindowStateTests
      atest RootTaskTests
Change-Id: I8a6a294598af52c83164b7d396e776f07523a556