Expand JankTracker

Bug: 27922347

* Dump the full histogram
* Expand the histogram to have a slow-frame section with
  large 50ms buckets to raise the cap to 5s to give more
  insight into system-health
* Stop excluding first-frame metrics as we want to include
  those in our global tracking. Automated tests already filter
  these out by doing resets before running anyway.

Change-Id: Idaba8aad591f59d10a6477b11efc0767ff715083