Emit events to indicate trace type
Emit events to indicate trace type

Just before recording traces emit an event that specifies what type of
trace was recorded. This information could be inferred from existing
events but that was too subtle - it's sometimes handy when analyzing a
trace to know how it was recorded and it's good to be explicit.

google/UIforETW,google/UIforETW,MikeMarcin/UIforETW,mwinterb/UIforETW,mwinterb/UIforETW,u-engine/UIforETW,MikeMarcin/UIforETW,MikeMarcin/UIforETW,ariccio/UIforETW,google/UIforETW,google/UIforETW,ariccio/UIforETW,mwinterb/UIforETW,u-engine/UIforETW,ariccio/UIforETW,u-engine/UIforETW,ariccio/UIforETW