Google, in the past has blocked or hidden the Chrome beta in the Google Play Store but that has finally come to an end. Typically, the Chrome betas are pretty stable so we don’t know what the reason for hiding it was.

Official description:

Welcome to Chrome Beta for Android!



- Preview the latest features: Try out the newest features. (Sometimes these may be a little rough around the edges.)
- Give early feedback: Let us know what you think and help make Chrome for Android a better browser.
You can install Chrome Beta alongside your current version of Chrome for Android. Chrome Beta will request additional permissions when using Chrome Sync for the first time.

Download at https://play.google.com/store/apps/details?id=com.chrome.beta