[graphite] Add RenderPassDesc info to graphite pipeline tracing

* Add RP information to graphite pipeline usage trace events to better inform precompilation needs and analyze patterns across regressions for potential improvements.

Change-Id: I433e01df46411600c82528967447fc41b2f273a9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1015436
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Auto-Submit: Nicolette Prevost <nicolettep@google.com>
1 file changed