In looking into  issue 822856 , it has resolved itself but there is now a recent uptick in CPU time usage. Opening this and kicking off a bisect to see what CL caused this.

https://chromeperf.appspot.com/report?sid=9f4d0914e334f8b88a92da1dd73ba113036ea5c0b2e1ca001f2e2e3ddac798f7&start_rev=559788&end_rev=565234
https://chromeperf.appspot.com/report?sid=92bc9eacb7df1c3c59ead19a26652d81f9b514e6c2869d3150f1b341d4bd4460&start_rev=559788&end_rev=565234