Add a "feature" to scale the disk cache size.

This is for use with the same disk cache for media experiment.

Bug: 789657
Change-Id: I3374166de4811df85b6c38e8988fee42a609f96f
Reviewed-on: https://chromium-review.googlesource.com/1124764
Reviewed-by: Maks Orlovich <[email protected]>
Commit-Queue: Matt Menke <[email protected]>
Cr-Commit-Position: refs/heads/master@{#573040}
diff --git a/net/disk_cache/cache_util.h b/net/disk_cache/cache_util.h
index 25940124..0a831ee 100644
--- a/net/disk_cache/cache_util.h
+++ b/net/disk_cache/cache_util.h
@@ -7,6 +7,7 @@
 
 #include <stdint.h>
 
+#include "base/feature_list.h"
 #include "net/base/net_export.h"
 #include "net/disk_cache/disk_cache.h"
 
@@ -16,6 +17,8 @@
 
 namespace disk_cache {
 
+NET_EXPORT_PRIVATE extern const base::Feature kChangeDiskCacheSizeExperiment;
+
 // Moves the cache files from the given path to another location.
 // Fails if the destination exists already, or if it doesn't have
 // permission for the operation.  This is basically a rename operation