commit 2588ab0fe9792480fe97edd589dfc25f1736f967
author Riddle Hsu <riddlehsu@google.com> Mon Feb 25 14:23:56 2019 +0800
committer Riddle Hsu <riddlehsu@google.com> Fri Mar 08 22:50:49 2019 +0800
tree f0d2dafb10297aa48e04e4cd40319b2c748b4bd8
parent 1cc1db0ab2b6277fc6decf2ece0e1b2ff484bf71

Dispose per-display input channel explicilty when removing display

Also simplify the initialization and cleanup of PointerEventDispatcher
because the null condition should never happen.

Bug: 126141550
Test: atest DisplayContentTests
Test: manual - Create virtual display and remove it many times. Observe
      no "Input channel object ... was finalized without being disposed!"
      in device log. And "dumpsys input" don't show MonitoringChannels
      in the removed display.

Change-Id: Id768a1a77169a91fd0762e166f49e15f37668000