How does the Google Hangouts extension create the panel window?

Question

The Doc says if you want to create a panel window ,you should use

chrome.windows.create({...,type:\"panel\"}, function callback)

At the sa

Answer 1

The Google Hangouts extension (formerly called "Chat for Google") is explicitly whitelisted in the source code, which allows it to use the panel feature even when --enable-panels flag is unset:

bool PanelManager::ShouldUsePanels(const std::string& extension_id) {
 ...
    return CommandLine::ForCurrentProcess()->HasSwitch(
        switches::kEnablePanels) ||
        extension_id == std::string("nckgahadagoaajjgafhacjanaoiihapd") ||
 ...