Trace critical workloads

Create a new trace track and trace all important work that happens on
the main thread. Keep track of changes in workload as transaction are
queued and committed to infer when the CPU load will increase from
the last frame. This CL only logs the workload.

Flag: EXEMPT logs
Bug: 333623207
Test: perfetto
Change-Id: Ib423d1968545adc89172bd0e40fbde2a31b46ddf