Http cache: Add support for a dedicated cache thread.

net/disk_cache/backend_impl.cc

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2006-2010 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.
 
 #include "net/disk_cache/backend_impl.h"
 
 #include "base/field_trial.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/histogram.h"
 #include "base/message_loop.h"
@@ skipping 155 matching lines @@
 
 namespace disk_cache {
 
 Backend* CreateCacheBackend(const FilePath& full_path, bool force,
                             int max_bytes, net::CacheType type) {
   // Create a backend without extra flags.
   return BackendImpl::CreateBackend(full_path, force, max_bytes, type, kNone);
 }
 
 int CreateCacheBackend(net::CacheType type, const FilePath& path, int max_bytes,
-                       bool force, Backend** backend,
+                       bool force, MessageLoop* thread, Backend** backend,
                        CompletionCallback* callback) {
   if (type == net::MEMORY_CACHE)
     *backend = CreateInMemoryCacheBackend(max_bytes);
   else
     *backend = BackendImpl::CreateBackend(path, force, max_bytes, type, kNone);
   return *backend ? net::OK : net::ERR_FAILED;
 }
 
 // Returns the preferred maximum number of bytes for the cache given the
 // number of available bytes.
@@ skipping 1503 matching lines @@
 
   return num_dirty;
 }
 
 bool BackendImpl::CheckEntry(EntryImpl* cache_entry) {
   RankingsNode* rankings = cache_entry->rankings()->Data();
   return !rankings->dummy;
 }
 
 }  // namespace disk_cache