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If handover requesters such as NFC want to cancel an
ongoing transfer, they can use this intent. It requires
the same permission that is used for whitelisting,
which at this point is only granted to the NFC service.

Change-Id: I89e27550d700c4a29a892dba99fda740d8845642

Change-Id: I66cea0e6b7a5e9377cb77e75ac21914fbbc95de4

Handover providers such as NFC may move the file in the filesystem
(out of /bluetooth), hence it's better not to scan them here.

Change-Id: Ic374c5ae880cb65e2d8a9ce615115b51fdc29353

Also, allow refreshing whitelisted entries by sending
another whitelist intent.

Change-Id: If85db397e31364939c67b3018413b625a1888ae6

Change-Id: I9862cbb427bcb5be81af2e09cc71208c1456be05

Change-Id: Ie86c651cb588dec834c629a429ddee49ca51bdd5

Change-Id: I476bff54ef18b9d35405429e0550d3e7b61971db

Change-Id: I886c43f6b61b1d37e9bd92533c6f43c148e46507

Change-Id: Ic54867813d76fe3c63a6d69799972730a61893eb

Change-Id: I5e41675842a972f1400a66cdf155e0fa7ba532f2

Change-Id: Ia11deef3743e0d63ccbe6f8eb6e311e3f2f11f69

Change-Id: If5a6ab133af77342121ff61d0aea40cc8626f956

Change-Id: I635726426ba283e8428bfa11abf90da16a824ae1

- Added a whitelist permission, to ensure only system
  services (such as NFC) can whitelist MAC addresses.
- Added HANDOVER_STATUS permission, to ensure handover
  transfer status can only be received by eligible services
  (such as NFC).
- Added new confirmation type HANDOVER_CONFIRMED; this indicates
  the transfer was initiated by a handover, and doesn't need to be
  confirmed. This type is also reused to send broadcasts
  to the NFC service, so the NFC service can show notifications
  and deal with the received data.
- Added 15 second timeout to whitelist.
- Modify notication code to not show any notifications for handover
  transfers; instead, send broadcasts to indicate handover status.
- Modify "transfer complete" code to sendbroasts to indicate handover
  status.
Change-Id: I00c08e09eaf44f0bd4bd837cb6b0c37b802742bc

Change-Id: I5cfa785854414256c441ca703ad2480f0434f6d2

Change-Id: Ia88990b571171704ec18c0c7766cb241579b907a

Add Bluetooth address white-listing to avoid receive confirmation from
Beam interactions.

Change-Id: I25720c6e902c494cbb9845a30a175edad4225b89

Change-Id: I292e4bd502c2f1569cbdb103529b7c4d6e01a52d

Change-Id: I3ec2408e9e4524df80d0f68d37b5376ae8f9e0f4

Change-Id: Ia20e0222899886a1a916fad99056f94083529b26