Calculate the size of all cache entries between two points in time.

net/disk_cache/simple/simple_backend_impl.h

Index: net/disk_cache/simple/simple_backend_impl.h
diff --git a/net/disk_cache/simple/simple_backend_impl.h b/net/disk_cache/simple/simple_backend_impl.h
index 3516847e1f72be9a2402edb5a417dce552a2cbd1..a0b4b9c42820e8b05f6dcd3639e5a534af077424 100644
--- a/net/disk_cache/simple/simple_backend_impl.h
+++ b/net/disk_cache/simple/simple_backend_impl.h
@@ -110,6 +110,10 @@ class NET_EXPORT_PRIVATE SimpleBackendImpl : public Backend,
   int DoomEntriesSince(base::Time initial_time,
                        const CompletionCallback& callback) override;
   int CalculateSizeOfAllEntries(const CompletionCallback& callback) override;
+  int CalculateSizeOfEntriesBetween(
+      base::Time initial_time,
+      base::Time end_time,
+      const CompletionCallback& callback) override;
   std::unique_ptr<Iterator> CreateIterator() override;
   void GetStats(base::StringPairs* stats) override;
   void OnExternalCacheHit(const std::string& key) override;
@@ -148,6 +152,13 @@ class NET_EXPORT_PRIVATE SimpleBackendImpl : public Backend,
   void IndexReadyForSizeCalculation(const CompletionCallback& callback,
                                     int result);
 
+  // Calculates the size all cache entries between |initial_time| and
+  // |end_time|. Invoked when the index is ready.
+  void IndexReadyForSizeBetweenCalculation(base::Time initial_time,
+                                           base::Time end_time,
+                                           const CompletionCallback& callback,
+                                           int result);
+
   // Try to create the directory if it doesn't exist. This must run on the IO
   // thread.
   static DiskStatResult InitCacheStructureOnDisk(