message: Add absl::Cord support to RAM file system so that internal ops/tests can use cords
diff: @@ -79,6 +79,13 @@ class RamRandomAccessFile : public RandomAccessFile, public WritableFile {
  return Status::OK();
  }
  +#if defined(PLATFORM_GOOGLE)
  + Status Append(const absl::Cord& cord) override {
  + data_->append(cord.char_begin(), cord.char_end());
  + return Status::OK();
  + }
  +#endif
  +
  Status Close() override { return Status::OK(); }
  Status Flush() override { return Status::OK(); }
  Status Sync() override { return Status::OK(); }
  