This CL introduces the updateTransportAttributes() API to be used by the
transport hosts. It doesn't actually use the description attributes yet,
this will go in another CL. This is because I want to test that CL
together with transport usage. Tests are lacking for TransportManager
and BMS, I'll still add them, but I'm trying to migrate Robolectric
first.
Ref: http://go/br-binding-on-demand
Bug: 17140907
Test: make RunFrameworksServicesRoboTests
Test: runtest -p com.android.server.backup frameworks-services
Test: gts-tradefed run commandAndExit gts-dev -m GtsBackupTestCases
Test: gts-tradefed run commandAndExit gts-dev -m GtsBackupHostTestCases
Test: cts-tradefed run commandAndExit cts-dev -m CtsBackupTestCases
Change-Id: I56f7b5a5026d21d8f11afb371d5560d4913c5f2a