Cannot open Chrome Trace Event profile

This file cannot be loaded into firefox profiler. To my knowledge, it conforms to the Chrome Trace Event format as specified by Google's documentation. Ref: https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview

```json
[
{"name": "Initialization", "cat": "", "ph": "X", "pid": 346905, "tid": 346905, "ts": 2343, "dur": 100}
]
```

The error message is:

```
Error: Unserializing the profile failed: Error: This does not appear to be a valid Gecko Profile, there is no meta field.
```

In fact, Firefox profiler cannot even open the file shown in that document as an example:

```json
[ {"name": "Asub", "cat": "PERF", "ph": "B", "pid": 22630, "tid": 22630, "ts": 829},
{"name": "Asub", "cat": "PERF", "ph": "E", "pid": 22630, "tid": 22630, "ts": 833} ]
```

The same file can be opened fine by other tools that support Trace Events format.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-42)