In the description for OnDevToolsAgentAttached: https://github.com/chromiumembedded/cef ... observer.h
It is said that:
// Method that will be called when the DevTools agent has attached. |browser|
// is the originating browser instance. This will generally occur in response
// to the first message sent while the agent is detached.
virtual void OnDevToolsAgentAttached(CefRefPtr<CefBrowser> browser) {}
Why de-tached?
It was meant - Attached ?