UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36

Steps to reproduce the problem:
1. Apply a background to a text element.
2. Set -webkit-background-clip to `text` via a CSS Custom Property on that element.

Here is a JSFiddle with a minimal repro of the issue: https://jsfiddle.net/0rxh6nox/1/

What is the expected behavior?
The background should be clipped to the text.

What went wrong?
The text disappears, and only the background is visible.

Did this work before? Yes r514071

Does this work in other browsers? Yes

Chrome version: 66.0.3359.181  Channel: stable
OS Version: 10.0
Flash Version: 

I performed a bisect of this issue. r514071 is the last known good build, and r514075 is the first known bad build.

Here's the commits between those two builds: https://chromium.googlesource.com/chromium/src/+log/314714c736ac5966f73716a66c69321bc5f7fa81..37218b85984625720e0b84bc34e421d6b93254f5

This commit seems to be the most likely culprit: https://chromium.googlesource.com/chromium/src/+/82479f4915c1da488897174bef80b957f060e701
 

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