Disk cache: Reference CL for the implementation of file format version 3.

net/disk_cache/backend_impl.h

Index: net/disk_cache/backend_impl.h
===================================================================
--- net/disk_cache/backend_impl.h	(revision 199883)
+++ net/disk_cache/backend_impl.h	(working copy)
@@ -25,6 +25,8 @@
 
 namespace disk_cache {
 
+struct Index;
+
 enum BackendFlags {
   kNone = 0,
   kMask = 1,                    // A mask (for the index table) was specified.
@@ -280,6 +282,9 @@
   bool InitBackingStore(bool* file_created);
   void AdjustMaxCacheSize(int table_len);
 
+  bool InitStats();
+  void StoreStats();
+
   // Deletes the cache and starts again.
   void RestartCache(bool failure);
   void PrepareForRestart();