message: Log final GCS cache attributes immediately prior to cache creation.
  The GCS caching attributes can be set via several environment variables, and in some
  cases interact with each other.  This log statement helps developers verify the final
  effect of these settings on the cache in use.
diff: @@ -631,6 +631,9 @@ GcsFileSystem::GcsFileSystem()
  // Setting either to 0 disables the cache; set both for good measure.
  block_size = max_bytes = 0;
  }
  + VLOG(1) << "GCS cache max size = " << max_bytes << " ; "
  + << "block size = " << block_size << " ; "
  + << "max staleness = " << max_staleness;
  file_block_cache_ = MakeFileBlockCache(block_size, max_bytes, max_staleness);
  // Apply overrides for the stat cache max age and max entries, if provided.
  uint64 stat_cache_max_age = kStatCacheDefaultMaxAge;
  