Use StatsFactory for emitting metrics from PageStore and add assertions
for the new metrics.
Bug: T359374
Change-Id: Id099f54eb79a2dce078259cf9c13e548c1ec56f2
When creating ServiceOptions objects or fake HashConfigs use the
constant to refer the config name
Change-Id: I59a29f25b76e896c07e82156c6cc4494f98e64cc
This makes the data stored by LinkCache compatible with PageStoreRecord,
so we can use LinkCache inside PageStore.
This causes PageStore to make use of local caching as well as WANObjectCache.
Note that getPageById() does not yet benefit from cache, but does
populate the cache.
Bug: T278940
Change-Id: Icc27a0d9299a3e4ce45521daef87ad06ec06f064
