Record stats for all caches

This is disabled by default in Guava, but we report in show-caches
average loading time. To ensure it isn't always 0, record stats.

Change-Id: I9861b0b20463c8893933d41788139a4c374caaab

gerrit-cache-h2/src/main/java/com/google/gerrit/server/cache/h2/DefaultCacheFactory.java

@@ -68,6 +68,7 @@ public class DefaultCacheFactory implements MemoryCacheFactory {
       CacheBinding<K, V> def,
       boolean unwrapValueHolder) {
     CacheBuilder<K,V> builder = newCacheBuilder();
+    builder.recordStats();
     builder.maximumWeight(cfg.getLong(
         "cache", def.name(), "memoryLimit",
         def.maximumWeight()));