docs: public GVRShaderId getShaderType(Class<? extends GVRShader> shaderClass)
      {
          GVRShaderId shaderId = mShaderTemplates.get(shaderClass);
  
          if (shaderId == null)
          {
              GVRContext ctx = getGVRContext();
              shaderId = new GVRShaderId(shaderClass);
              mShaderTemplates.put(shaderClass, shaderId);
              shaderId.getTemplate(ctx);
          }
          return shaderId;
      }