public Builder addSourceUriBytes(
              com.google.protobuf.ByteString value) {
            if (value == null) { throw new NullPointerException(); }
            ensureSourceUriIsMutable();
            sourceUri_.add(value);
            bitField0_ |= 0x00000020;
            onChanged();
            return this;
          }
public Builder addSourceUriBytes(
              com.google.protobuf.ByteString value)