src/vs/workbench/services/themes/browser/productIconThemeData.ts/ProductIconThemeData/fromExtensionTheme
class ProductIconThemeData:	static fromExtensionTheme(iconTheme: IThemeExtensionPoint, iconThemeLocation: URI, extensionData: ExtensionData): ProductIconThemeData {
		const id = extensionData.extensionId + '-' + iconTheme.id;
		const label = iconTheme.label || Paths.basename(iconTheme.path);
		const settingsId = iconTheme.id;

		const themeData = new ProductIconThemeData(id, label, settingsId);

		themeData.description = iconTheme.description;
		themeData.location = iconThemeLocation;
		themeData.extensionData = extensionData;
		themeData.watch = iconTheme._watch;
		themeData.isLoaded = false;
		return themeData;
	}