RFC: use some in-memory state in SimpleCache to quickly cache-miss some CantConditionalize cases

net/disk_cache/simple/simple_backend_impl.h

 // Copyright (c) 2013 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 NET_DISK_CACHE_SIMPLE_SIMPLE_BACKEND_IMPL_H_
 #define NET_DISK_CACHE_SIMPLE_SIMPLE_BACKEND_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 80 matching lines @@
   // SimpleIndexDelegate:
   void DoomEntries(std::vector<uint64_t>* entry_hashes,
                    const CompletionCallback& callback) override;
 
   // Backend:
   net::CacheType GetCacheType() const override;
   int32_t GetEntryCount() const override;
   int OpenEntry(const std::string& key,
                 Entry** entry,
                 const CompletionCallback& callback) override;
+  int OpenEntryWithOracleByte(const std::string& key,
+                              Entry** entry,
+                              const OracleCallback& oracle,
+                              const CompletionCallback& callback) override;
   int CreateEntry(const std::string& key,
                   Entry** entry,
                   const CompletionCallback& callback) override;
   int DoomEntry(const std::string& key,
                 const CompletionCallback& callback) override;
   int DoomAllEntries(const CompletionCallback& callback) override;
   int DoomEntriesBetween(base::Time initial_time,
                          base::Time end_time,
                          const CompletionCallback& callback) override;
   int DoomEntriesSince(base::Time initial_time,
@@ skipping 119 matching lines @@
   // operations to be run at the completion of the Doom.
   std::unordered_map<uint64_t, std::vector<base::Closure>>
       entries_pending_doom_;
 
   net::NetLog* const net_log_;
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_SIMPLE_SIMPLE_BACKEND_IMPL_H_