private long getNextDelay() {
        long result = currentDelay;
        currentDelay = Math.min(currentDelay * BACKOFF_RATIO, MAX_BACKOFF_MS);
        return result;
    }
Attempts to allocate {@link Bitmap}s and returns {@code true} if there are more
{@link Bitmap}s to allocate and {@code false} otherwise.
core/src/main/java/com/bumptech/glide/load/engine/prefill/BitmapPreFillRunner.java