73a3cb3848
An app that fires up a restore session but then crashes or drops its session reference will currently render restore functions totally unavailable until the device is rebooted. This CL introduces an inactivity timeout [currently 60 seconds] on restore sessions, after which the session is shut down and becomes unavailable to the app who nominally still held it. Synchronization between the timeout and the normal asynchronous use of the session by the application is managed by running both the timeout action and the normal teardown process on the backup manager service's handler thread. Bug 3276362 Change-Id: I1f63b83e96e66b0e7eb15a1e20e375049babf06e