Chrome Version       : Trunk
Other browsers tested:
  Add OK or FAIL after other browsers where you have tested this issue:
     Safari: PASS
    Firefox: PASS
    IE/Edge: didn't check

What steps will reproduce the problem?
1. Run on the console CSS.supports("margin: var(--foo) something absolutely pointless")
2. Run on the console CSS.supports("margin: someting-absolutely-pointless(var(--foo))")

What is the expected result?
Both return true, parse, and compute to invalid at computed-value time.

What happens instead of that?
First one correctly returns true, but second one does not. But I don't see what should make them behave differently.