src/vs/workbench/contrib/webview/electron-browser/webviewElement.ts/ElectronWebviewBasedWebview/doPostMessage
class ElectronWebviewBasedWebview:	protected async doPostMessage(channel: string, data?: any): Promise<void> {
		this._myLogService.debug(`Webview(${this.id}): did post message on '${channel}'`);
		this.element?.send(channel, data);
	}