@Override
  public byte read(int ashmemMemoryOffset) {
    // NULLSAFE_FIXME[Nullable Dereference]
    return mBuf[ashmemMemoryOffset];
  }
A fake implementation of {@link com.facebook.memory.ashmem.AshmemMemoryChunk} to allow us to test
out pools and other functionality. This uses byte arrays instead of actual ashmem memory, but
supports the same public interface
memory-types/ashmem/src/test/java/com/facebook/imagepipeline/testing/FakeAshmemMemoryChunk.java