Collect DMSAA stats

Adds counters for the number of render passes, number of MSAA render
passes, and each op that either does or would trigger MSAA. Adds a
bot that collects stats on the html (not svg) skps.

Bug: skia:11396
Change-Id: Ic48263d6310670d8f0d09ec4c4bf6a2b83fc7d02
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/401636
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
14 files changed