1. Open chrome://inspect version 66.
2. Connect a device with browser version <= 65.
3. Inspect a page from that browser by clicking "inspect" on chrome://inspect.
4. Try to click and drag on the screencast area.

Nothing happens. We actually get the following error:
"Request Input.emulateTouchFromMouseEvent failed. {"code":-32602,"message":"Invalid parameters","data":"timestamp: double value expected"}"

This was regressed by https://chromium.googlesource.com/chromium/src/+/5ba3218966ea7d7063bbc00577778952b53c463a