Nvidia's Tegra SoCs have already worked their way into a couple of Chromebooks. Acer rolled out a 13-incher in August, while HP added a larger 14" unit in December. Both are based on the Tegra K1, and now, evidence points to the possible existence of next-gen Chrome devices with the latest Tegra X1 chip.
According to CNX Software, references to a "T210" processor have appeared in the Chromium and Coreboot source code. That designation is short for Tegra 210—and Tegra X1—the site says. The references appear to be tied to two systems code-named Foster and Smaug. It's unclear whether those represent development platforms or actual products, though. They could be Chromebooks, Chromeboxes, or something else entirely.
Announced at CES this year, the Tegra X1 has big.LITTLE combination of quad ARM Cortex A57 and A53 cores. The integrated graphics are based on Nvidia's Maxwell architecture, and the chip has already worked its way into Nvidia's Shield console. Rumor has it the Tegra X1 is also destined for updated Shield Tablet and Shield Portable systems, so I wouldn't be surprised to see it land in new Chrome devices, as well.