message: fix filameshio test
  when testing we're often using the NoopDriver, which
  is has neither spirv or text shaders, so we default
  to text to make this case work.
diff: @@ -85,6 +85,9 @@ struct MaterialParserDetails {
  mDictionaryTag = ChunkType::DictionarySpirv;
  break;
  default:
  + // this is for testing purpose -- for e.g.: with the NoopDriver
  + mMaterialTag = ChunkType::MaterialGlsl;
  + mDictionaryTag = ChunkType::DictionaryGlsl;
  break;
  }
  }
  