1. @DomName('CanvasRenderingContext2D.isContextLost')
  2. @DocsEditable()
  3. @Experimental()
bool isContextLost()

Source 

@DomName('CanvasRenderingContext2D.isContextLost')
@DocsEditable()
@Experimental() // untriaged
bool isContextLost() => _blink.BlinkCanvasRenderingContext2D.instance
    .isContextLost_Callback_0_(this);