private void maybeSetFailure() {
      int finished = mFinishedDataSources.incrementAndGet();
      if (finished == mNumberOfDataSources && mDelayedError != null) {
        setFailure(mDelayedError, mDelayedExtras);
      }
    }
Creates a new data source supplier with increasing-quality strategy with optional lazy state
creation.

<p>Note: for performance reasons the list doesn't get cloned, so the caller of this method
should not modify the list once passed in here.

@param dataSourceSuppliers list of underlying suppliers
@param dataSourceLazy if true, the state of data source would be created only if necessary
fbcore/src/main/java/com/facebook/datasource/IncreasingQualityDataSourceSupplier.java