Disk cache: Open the disk cache experiment for new users....

net/disk_cache/backend_impl.h

 // Copyright (c) 2006-2008 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.
 
 // See net/disk_cache/disk_cache.h for the public interface of the cache.
 
 #ifndef NET_DISK_CACHE_BACKEND_IMPL_H_
 #define NET_DISK_CACHE_BACKEND_IMPL_H_
 
 #include "base/hash_tables.h"
 #include "base/timer.h"
 #include "net/disk_cache/block_files.h"
 #include "net/disk_cache/disk_cache.h"
 #include "net/disk_cache/eviction.h"
 #include "net/disk_cache/rankings.h"
 #include "net/disk_cache/stats.h"
 #include "net/disk_cache/trace.h"
 
 namespace disk_cache {
 
 enum BackendFlags {
   kMask = 1,
   kMaxSize = 1 << 1,
   kUnitTestMode = 1 << 2,
   kUpgradeMode = 1 << 3,
-  kNewEviction = 1 << 4
+  kNewEviction = 1 << 4,
+  kNoRandom = 1 << 5
 };
 
 // This class implements the Backend interface. An object of this
 // class handles the operations of the cache for a particular profile.
 class BackendImpl : public Backend {
   friend class Eviction;
  public:
   explicit BackendImpl(const std::wstring& path)
       : path_(path), block_files_(path), mask_(0), max_size_(0),
         cache_type_(net::DISK_CACHE), uma_report_(0), user_flags_(0),
@@ skipping 126 matching lines @@
 
   // Sets internal parameters to enable unit testing mode.
   void SetUnitTestMode();
 
   // Sets internal parameters to enable upgrade mode (for internal tools).
   void SetUpgradeMode();
 
   // Sets the eviction algorithm to version 2.
   void SetNewEviction();
 
+  // Sets an explicit set of BackendFlags.
+  void SetFlags(uint32 flags);
+
   // Clears the counter of references to test handling of corruptions.
   void ClearRefCountForTest();
 
   // Peforms a simple self-check, and returns the number of dirty items
   // or an error code (negative value).
   int SelfCheck();
 
   // Same bahavior as OpenNextEntry but walks the list from back to front.
   bool OpenPrevEntry(void** iter, Entry** prev_entry);
 
@@ skipping 96 matching lines @@
 
   DISALLOW_EVIL_CONSTRUCTORS(BackendImpl);
 };
 
 // Returns the prefered max cache size given the available disk space.
 int PreferedCacheSize(int64 available);
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_BACKEND_IMPL_H_