Touch action options
Touch actions allow a developer to define how a user can interact with an element and Chrome now has wider support for touch-action options in Chrome 55.
Web Push Interoperability Wins
Web push has had a few updates in recent versions of Chrome. GCM now supports the web push protocol and if you use VAPID you won't need to sign up for a Google Developer Project and you'll be given an FCM endpoint.
Experiment Time - Scroll Anchoring
Scroll anchoring stops a web page from moving once you've started reading the content.
Instant Loading Web Apps with an Application Shell Architecture
Application shell architecture is a method of building progressive web apps today, taking advantage of a range of technologies.
Notifying you of Changes to Notifications
Two new API's have been added in Chrome 44 which makes using Notifications with push easier to work with and customize.
Cut and copy commands
The support for cut and copy commands allows you to programmatically cut and copy selected text to the users clipboard.
Permissions API for the Web
The Permissions API gives you a central place to check the permission status of an API.
Precision touch for precise gestures
TouchEvents have changed in Chrome to return float values, instead of integers, to account for varying screen densities. This leads to more detailed feedback during slow gestures.