Tests the bottom panel shows information as expected.

Panel view:
    Click the record button
Panel view:
    Recording Background Fetch activity...,DevTools will record all Background Fetch activity for up to 3 days, even when closed.
Panel view:
    Click the record button
Panel view:
    Select an entry to view metadata
Panel view:
    No metadata for this event
Panel view:
    key: value
Panel view:
    Click the record button