The Google Support Services (GSS) app allows you to share your Android device screen with a Google customer support agent for a personalized support experience. With GSS on your device, the agent can invite you to share your screen, and guide you with on-screen annotations making it faster and easier to resolve your issue. While sharing your screen, the agent will not be able to control your device, but will be able see your screen to help explain their instructions. You can completely stop or pause sharing your screen at any time.
This app comes pre-installed on Pixel devices, and Nexus devices with Android 7.1.1 or higher; it can be installed on most devices with Android 5.0 or higher. This app cannot be started by itself and is used only when a Google customer support agent sends an invite to the user to share their screen. Google Support Services