SimpleCache: read small files all at once.

net/disk_cache/simple/simple_experiment.h

Index: net/disk_cache/simple/simple_experiment.h
diff --git a/net/disk_cache/simple/simple_experiment.h b/net/disk_cache/simple/simple_experiment.h
index 2231e852266f27aa449e23cc4295c6fccc6e20e5..982c42b8559ab9420391f3ed7e482f1eb8eaddeb 100644
--- a/net/disk_cache/simple/simple_experiment.h
+++ b/net/disk_cache/simple/simple_experiment.h
@@ -31,6 +31,13 @@ struct NET_EXPORT_PRIVATE SimpleExperiment {
 NET_EXPORT_PRIVATE SimpleExperiment
 GetSimpleExperiment(net::CacheType cache_type);
 
+NET_EXPORT_PRIVATE extern const base::Feature kSimpleCachePrefetchExperiment;
+NET_EXPORT_PRIVATE extern const char kSimplePrefetchBytesParam[];
+
+// Returns how large a file would get prefetched on reading the entry.
+// If the experiment is disabled, returns 0.
+NET_EXPORT_PRIVATE int GetSimpleCachePrefetchSize();

[pasko, 2017/07/18 14:02:57]

I think this file is for experiments that depend on persistent state on disk
(hence some index manipulations). The prefetch experiment does not need any of
this, hence it can be kept local to the sync entry. Not sure we can remove the
NET_EXPORT_PRIVATE if we want to test it, but the explicit separation would be
good.

[Maks Orlovich, 2017/07/25 16:06:29]

OK, done. This PoV is more convincing with the eviction experiment here..

+
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_SIMPLE_SIMPLE_EXPERIMENT_H_