1. DomName('WebGL2RenderingContext.getUniformBlockIndex')
  2. DocsEditable()
  3. Experimental()
int getUniformBlockIndex(Program program, String uniformBlockName)

Source 

@DomName('WebGL2RenderingContext.getUniformBlockIndex')
@DocsEditable()
@Experimental() // untriaged
int getUniformBlockIndex(Program program, String uniformBlockName) => _blink.BlinkWebGL2RenderingContext.instance.getUniformBlockIndex_Callback_2_(this, program, uniformBlockName);