Returning a GATT connection object for already connected devices.
This CL modifies the behavior of
BluetoothDeviceChromeOS::CreateGattConnection. The call will succeed
even when the device is already connected, and a new
BluetoothGattConnection object will be passed to the callback.
Currently, there is no way to retrieve a BluetoothGattConnection object
for an already connected device.
BUG=482025
Review URL: https://codereview.chromium.org/
1110163002
Cr-Commit-Position: refs/heads/master@{#328299}