* Since commit eb57617 [1], the legacy callback interfaces in the Android
AudioTrack system have been deprecated and replaced by a newer callback
interface. Consequently, the user parameter, which was previously part
of the constructor, has been incorporated into this new interface.
* To address the resulting build issues, update the function signatures
to match the new methods. Although AOSP provides a wrapper [2] for this
purpose, it's declared within an anonymous namespace, effectively making
it private to its own translation unit. To work around this limitation,
provide a local copy of the wrapper instead.
* Also format the shim with `clang-format`.
- [1]: eb57617e55
- [2]: https://cs.android.com/android/platform/superproject/main/+/main:frameworks/av/media/libaudioclient/AudioTrack.cpp;l=289;bpv=1
Change-Id: Ieae7df3f5f003538a0319cc77051322a989b93a8
