This benchmark regressed on my 2015 MBP from a score of 4,080 to 1,403.

Bisect range: https://chromium.googlesource.com/chromium/src/+log/884d7a035691d0f18879af99a1ab188a7564692e..f640d3cbd00447abe17877078f14c73ad6aca26d

The likely change is: https://chromium.googlesource.com/chromium/src/+/f72170ee0164e5d4bcf14551603907ffafd969f1

"Make 'transform' a presentation attribute on SVG elements by fs"

Sorry we missed this because of not continuously running all MotionMark tests on perf waterfall.  That's currently blocked from landing on concerns from cycle time running the tests.  https://codereview.chromium.org/2771343003/