@Override
  public void close() {
    mBuf = null;
  }
A fake implementation of {@link com.facebook.imagepipeline.memory.NativeMemoryChunk} to allow us
to test out pools and other functionality. This uses byte arrays instead of actual native memory,
but supports the same public interface
memory-types/nativememory/src/test/java/com/facebook/imagepipeline/testing/FakeNativeMemoryChunk.java