Tests console output from PaintWorklet.

Message count: 6
VM console-worklet-script.js:1 Information
VM console-worklet-script.js:2 Log
VM console-worklet-script.js:3 Warning
(anonymous) @ VM console-worklet-script.js:3
console-worklet-script.js:1 Information
console-worklet-script.js:2 Log
console-worklet-script.js:3 Warning
(anonymous) @ console-worklet-script.js:3