Rather than hardcoding MTP as the appropriate default when the user
selects "Charger Only", call UsbDeviceManager.setCurrentFunction(null).
Null is intended to restore the default function, which is appropriate
for charging only.
Bug: 21429947
Change-Id: I9ee633bcf2f95f9937861c234ab044873202d41b
When adb is disabled, the default usb mode would be "none", which
would turn off the driver and prevent UsbDeviceManager from receiving
any new USB connect / disconnect messages. This prevents the user
from ever enabling MTP and sharing data when adb is turned off.
As discussed in bug 21429947, we work around this problem by keeping
the USB driver in MTP mode most of the time, so that we continue to
receive USB connect / disconnect messages.
To avoid leaking confidential user photos, we now explicitly unlock
USB data after switching into MTP/PTP mode. Enabling MTP mode is
now decoupled from exposing data on the USB connection.
Bug: 21429947
Change-Id: Id8e9df4ac42fdcf22cc5b75b838bf46f6c225081
Create a new UI for managing USB access control. This UI is implemented
as a transparent popup triggered by a persistent notification.
Delete the old UI for controlling this. It is no longer used.
Bug: 18905620
Change-Id: I54186961414447a9d37f68e946e1c167506170ae
