No surprises here. Google Chrome team has device and script that automates Chromebook touchpad testing. They call it Quickstep.

The Quickstep device is designed to facilitate the measurement of drag-latency for touch devices. We define drag-latency as the amount of time between a finger sliding over (x, y) on the device and the firmware reporting (x,y) to the kernel. This is distinct from tap-latency where you would be measuring the amount of time between a finger contacting the pad and the first report being fired. Quickstep does not measure tap-latency, only drag-latency. Similarly, this only measures the latency between the sensor, touch controller firmware, and up to the kernel, and does not involve the screen/graphics stack at all. This only measures low-level latency and is not intended as an end-to-end solution.

Read the full documentation here. Now, here is a video demo:

via François Beaufort