Show the exact cache size for time ranges if supported

components/browsing_data/content/conditional_cache_counting_helper.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_BROWSING_DATA_CONTENT_CONDITIONAL_CACHE_COUNTING_HELPER_H_
 #define COMPONENTS_BROWSING_DATA_CONTENT_CONDITIONAL_CACHE_COUNTING_HELPER_H_
 
 #include <memory>
 
 #include "base/callback_forward.h"
 #include "net/base/net_errors.h"
 #include "net/disk_cache/disk_cache.h"
 
 namespace content {
 class StoragePartition;
 }
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace browsing_data {
 
 // Helper to count the size of the http cache data from a StoragePartition.
 class ConditionalCacheCountingHelper {
  public:
-  // Returns the number bytes in the selected range.
-  typedef base::Callback<void(int64_t)> CacheCountCallback;
+  // Returns the number bytes in the selected range and if this value is an
+  // upper estimate.
+  typedef base::Callback<void(int64_t, bool)> CacheCountCallback;
 
   static ConditionalCacheCountingHelper* CreateForRange(
       content::StoragePartition* storage_partition,
       base::Time begin_time,
       base::Time end_time);
 
   // Count the cache entries according to the specified time range. Destroys
   // this instance of ConditionalCacheCountingHelper when finished.
   // Must be called on the UI thread!
   //
@@ skipping 24 matching lines @@
 
   void Finished();
 
   void CountHttpCacheOnIOThread();
   void DoCountCache(int rv);
 
   // Stores the cache size computation result before it can be returned
   // via a callback. This is either the sum of size of the the two cache
   // backends, or an error code if the calculation failed.
   int64_t calculation_result_;
+  bool is_upper_limit_;
 
   CacheCountCallback result_callback_;
   const base::Time begin_time_;
   const base::Time end_time_;
 
   bool is_finished_;
 
   const scoped_refptr<net::URLRequestContextGetter> main_context_getter_;
   const scoped_refptr<net::URLRequestContextGetter> media_context_getter_;
 
   CacheState next_cache_state_;
   disk_cache::Backend* cache_;
 
   std::unique_ptr<disk_cache::Backend::Iterator> iterator_;
 
   base::WeakPtrFactory<ConditionalCacheCountingHelper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ConditionalCacheCountingHelper);
 };
 
 }  // namespace browsing_data
 
 #endif  // COMPONENTS_BROWSING_DATA_CONTENT_CONDITIONAL_CACHE_COUNTING_HELPER_H_