UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36

Steps to reproduce the problem:
1. Start tracing with all Categories selected (and ipc.flow, skia).
2. Refresh pre-opened local webpages.
3. Stop the tracing.

What is the expected behavior?

What went wrong?
The tracing page showed these warnings:
Import Warning: UserModelBuilder: Please file a bug with this trace: double-handled event:MouseDown@3020.2100000083447
Import Warning: UserModelBuilder: Please file a bug with this trace: double-handled event:MouseDown@5852.265000015497
Import Warning: UserModelBuilder: Please file a bug with this trace: double-handled event:MouseDown@8356.25600001216

Did this work before? N/A 

Chrome version: 58.0.3029.110  Channel: stable
OS Version: 10.0
Flash Version:
 

Deleted: trace_doublehandledMD.json.gz 5.9 MB

trace_doublehandledMD.json.gz 5.9 MB Download