The tags item in the trace data is arbitrary metadata added to `build` steps by Soong (and my Kati via `.KATI_TAGS` target-specific variables). Include this in the perfetto trace so we can analyze it. Bug: http://b/259130368 Test: End to end test tracing cp time in dist targets Change-Id: I85d33f579dc40dbae616b24cd4cb150d86262470
This comes from https://android.googlesource.com/platform/external/ninja/+/master/src/frontend.proto The only difference is the specification of a go_package. To regenerate frontend.pb.go, run regen.sh.