getAppVariantManifest(oRootControl) {
			oRootControlRunningApp = oRootControl;
			const oManifest = fnGetManifest();
			if (oManifest["sap.app"] && oManifest["sap.app"].id) {
				return AppVariantFactory.load({
					id: oManifest["sap.app"].id
				});
			}
			return Promise.resolve(false);
		}
@param {object} oRootControl - Root control of an app (variant)
@returns {Promise} Resolved promise with an app variant manifest
@description Getting here an app variant manifest from the layered repository.