src/vs/workbench/api/browser/mainThreadUrls.ts/ExtensionUrlHandler/handleURL
class ExtensionUrlHandler:	handleURL(uri: URI, options?: IOpenURLOptions): Promise<boolean> {
		if (!ExtensionIdentifier.equals(this.extensionId, uri.authority)) {
			return Promise.resolve(false);
		}

		return Promise.resolve(this.proxy.$handleExternalUri(this.handle, uri)).then(() => true);
	}