Chromium Code Shows Chrome Is Building a Built-In Notebook Feature

Two commits merged into Chromium this month show Google laying the groundwork for a notebook feature built directly into Chrome. The changes, spotted in Chromium’s public code review system, add a new components/notebooks module and the plumbing for a configurable “Notebook Home” page inside the browser.

The first change, Notebooks: Add service skeleton and factory, landed on July 14 and introduces NotebooksService along with its factory. The commit description is explicit about scope: the service is only initialized in non-empty form on desktop, it is not initialized for Android or iOS in this change, and Incognito mode gets an empty service fallback. In other words, this is a desktop feature first, and it is deliberately switched off in private browsing.

The second change, Notebook Home: Add URL configuration infrastructure, merged on July 20. It defines a kNotebookHomeURL feature parameter attached to the kNotebooks feature flag, adds a --notebook-home-url command-line switch, and creates an entry on the chrome://flags page so the URL can be set without editing a launch shortcut. The default value is about:blank — a blank page — which means Google has not yet wired up whatever destination this will eventually point to.

The most telling line in that commit is the stated pattern it follows: chrome://glic. That is the internal URL Chrome uses for Gemini in Chrome, the AI side panel Google shipped to desktop users. Building Notebook Home the same way suggests it will be a Google-hosted web surface loaded inside a dedicated Chrome UI rather than a locally rendered page — the same architecture that lets Google update the experience server-side without shipping a new Chrome release.

Neither commit mentions NotebookLM, which Google renamed to Gemini Notebook in July 2026, and neither describes what the feature does for users. But the naming, the desktop-only scope, the Incognito exclusion, and the configurable remote URL all point in a familiar direction: bringing Google’s research-and-notes AI product into the browser itself, the way Gemini in Chrome already lives in the side panel.

As with any flag spotted in Chromium’s source code, this is an early, experimental signal rather than a confirmed feature. Google frequently tests changes this way and ships them later, modifies them substantially, or abandons them entirely before they ever reach a stable Chrome release.

There is nothing for users to try yet. The flag exists, but it points at a blank page, and no user-facing Notebook interface has appeared in Chrome Canary. We will update this post when the URL parameter gets a real destination.