docs: public synchronized void decrease(Bitmap bitmap) {
      final int bitmapSize = BitmapUtil.getSizeInBytes(bitmap);
      Preconditions.checkArgument(mCount > 0, "No bitmaps registered.");
      Preconditions.checkArgument(
          bitmapSize <= mSize,
          "Bitmap size bigger than the total registered size: %d, %d",
          bitmapSize,
          mSize);
      mSize -= bitmapSize;
      mCount--;
    }