arc/bluetooth: Save BluetoothGattConnection objects

arc/bluetooth: Save BluetoothGattConnection objects

When we make outbound GATT connections, we were immediately
letting them expire in OnGattConnected, which meant we would
disconnect remote devices as soon as they were connected to us.

BUG=644792
TEST=make GATT connections from inside the container and
  verify that they stay connected, disconnect and verify that
  the device is disconnected

Review-Url: https://codereview.chromium.org/2321693002
Cr-Commit-Position: refs/heads/master@{#417097}
(cherry picked from commit fcca36a57736c9f17c30607904a4e73b95461744)

Committed: https://chromium.googlesource.com/chromium/src/+/f11bdf8310561eb3fa7354dff30c28274efc263f

[Miao, 2016-09-08 22:00:21]

Description was changed from

==========
arc/bluetooth: Save BluetoothGattConnection objects

When we make outbound GATT connections, we were immediately
letting them expire in OnGattConnected, which meant we would
disconnect remote devices as soon as they were connected to us.

BUG=644792
TEST=make GATT connections from inside the container and
  verify that they stay connected, disconnect and verify that
  the device is disconnected

Review-Url: https://codereview.chromium.org/2321693002
Cr-Commit-Position: refs/heads/master@{#417097}
(cherry picked from commit fcca36a57736c9f17c30607904a4e73b95461744)
==========

to

==========
arc/bluetooth: Save BluetoothGattConnection objects

When we make outbound GATT connections, we were immediately
letting them expire in OnGattConnected, which meant we would
disconnect remote devices as soon as they were connected to us.

BUG=644792
TEST=make GATT connections from inside the container and
  verify that they stay connected, disconnect and verify that
  the device is disconnected

Review-Url: https://codereview.chromium.org/2321693002
Cr-Commit-Position: refs/heads/master@{#417097}
(cherry picked from commit fcca36a57736c9f17c30607904a4e73b95461744)

Committed:
https://chromium.googlesource.com/chromium/src/+/f11bdf8310561eb3fa7354dff30c...
==========

[Miao, 2016-09-08 22:00:24]

Committed patchset #1 (id:1) manually as
f11bdf8310561eb3fa7354dff30c28274efc263f.