Google regularly introduces new features in Chrome through 'flags,' toggles that are only accessible through the chrome://flags page. Even though the flags page is hidden, Google also sometimes enables experimental features automatically in limited tests, leaving some to wonder what changed. Now it seems Google is working on a more obvious place to try unfinished features.
The new functionality in Chrome Canary, named 'Chrome Labs,' adds a beaker icon next to the address bar. When clicked, the button opens a popup with toggles for features otherwise only accessible through the chrome://flags page. At the moment, it only contains options for Reading List and Tab Search, but Google will likely cycle features in and out of the menu. Changing any of the options will prompt you to restart Chrome, just like with the regular flags page.
Chrome Labs can be turned on by setting chrome://flags/#chrome-labs to 'Enabled.' It's not clear yet if Google plans to show the Labs button to all Chrome users, or if it will only appear if you're enrolled in certain server-side rollouts. Chrome Labs also isn't available on Android, only desktop platforms.