code: function mapGptSlotSizes(aGPTSlotSizes) {
        var aSlotSizes = [];
        for (var i = 0; i < aGPTSlotSizes.length; i++) {
          try {
            aSlotSizes.push([aGPTSlotSizes[i].getWidth(), aGPTSlotSizes[i].getHeight()]);
          } catch (e) {
            utils.logWarn('slot size ' + aGPTSlotSizes[i].toString() + ' not supported by' + MODULE_NAME);
          }
        }
        return aSlotSizes;
      }
docs: function to convert google tag slot sizes to [[w,h],...]