Use LruCacheMap for StoreRecord, default capacity=100 (#5422)
Use LruCacheMap for StoreRecord, default capacity=100 (#5422)

* Use LruCacheMap for StoreRecord, default capacity=100

* test capacity = 1

* revert to 100 cache entries
PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs