BluetoothMetrics: Add Bluetooth stack latencies for L2cap coc metrics

MDR: https://eldar.corp.google.com/assessments/152668825
Bug: 266625932
Test: make
Change-Id: I884978f7d9a6430ccbe04de674eefd60187d356e
1 file changed
tree: 11bea265382470e026ea146b52263983281953f6
  1. stats/
  2. OWNERS