tree fdf3fce5c91dc20d33c19b334370c2797f21d8e8
parent 788302a1e8520808a33086fc5cdf16af842d428f
author Daniele Di Proietto <ddiproietto@google.com> 1645451392 +0000
committer Daniele Di Proietto <ddiproietto@google.com> 1645708602 +0000

Export atrace categories from ftrace data source descriptor

traced_probes invokes `atrace --list_categories` on startup.

Running atrace --list-categories appears to take ~120 ms.

This is going to be used by traceur, which cannot run atrace directly.

tested:

```
adb shell perfetto --query-raw | protoc --decode=perfetto.protos.TracingServiceState -I ~/master/external/perfetto ~/master/external/perfetto/protos/perfetto/trace/perfetto_trace.proto
```

Bug: 219393750
Change-Id: Ie97533317dfcb14fd1a452e5e30cf77cc8a3c871