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A HIDL adapter takes an x.(y+1) interface and registers
it as an x.y interface for testing.
This library allows someone or something to run an adapter.
Note: this requires b/62303973 to properly mock a lower interface version.
Note: this requires adapters to run as root to get around sepolicy.
Bug: 37518178
Test: can switch out implementations
~/android/master$ lshal | grep hidl.allocator
Y android.hidl.allocator@1.0::IAllocator/ashmem 0/1 652 471
~/android/master$ lshal | grep hidl.allocator
Y android.hidl.allocator@1.0::IAllocator/ashmem 0/1 7635 471
~/android/master$ lshal | grep hidl.allocator
Y android.hidl.allocator@1.0::IAllocator/ashmem 0/1 652 471
Change-Id: Ic72feb3a2fd4649e67b396c33b9a292e9c0a944a
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