Add ExternalDisplay atoms

ExternalDisplayStateChanged tracks connection
state of the external display.

Change-Id: I4def38cf049f1819c1cd83a9d2e219acd7a7c181
Bug: 310976810
Test: statsd_testdrive 806
3 files changed
tree: c87848e9a0825aa251c0cdb258c653f501c2788b
  1. stats/
  2. OWNERS