chromium-build-stats.appspot.com's trace viewer always sets category "target", but might be more useful to set category according to target name (extensions?) to categorize "*.o", "*.so", "*.jack", etc?


https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/edit

cat: The event categories. This is a comma separated list of categories for the event. The categories can be used to hide events in the Trace Viewer UI.