tree f4f5cf048b3fb7526de179f9d9a788d87bce93df
parent 1ad297be4b4b13f08ec5d99686656df3b7f3239c
author Jack He <siyuanh@google.com> 1527023049 -0700
committer Jack He <siyuanh@google.com> 1527031148 -0700

PhonePolicy: Only auto connect to the last active A2DP device

* Only auto connect to the last device indicated by
  BluetoothA2dp.ACTION_ACTIVE_DEVICE_CHANGED intent
* Ignore the intent when EXTRA_DEVICE is null since we cannot tell
  if setting active device to null is due to user action or due to
  device disconnection. Consider revising this policy in future
  revisions of phone policy

Bug: 79995170
Test: PhonePolicyTest, connect and toggle Bluetooth
Change-Id: I0a0b34e69c6db206fcb6ca67e7edd6421a61f586