For example, SVGs benefit extensively from raster caching - yet I mostly discovered there were raster cache problems by setting breakpoints in the engine. If we have tooling to debug this for framework/google3 users, then we need to document it. If we don't then we should consider adding ways to pull raster cache information such as whether or not a picture was raster cached, when it was evicted, how frequently the cache is hit vs missed.

This also ties in with #87835, because without good tooling it is difficult/impossible to documented how to use it