* viz: profile RewriteSteps in TINY device
* use TracingKey with category
* split by whitespace
* add tracing.py
* work
* tracing_key
* TRACK_MATCH_STATS=3, can this be in defaults?
* fallback name
* work
* javascript
* measure text is slow
* checkout
* profile graph_rewrite/graph_rewrite_map
* change that
* no as
* finally
* work
* linking works