Add an IO thread index bitmap to disk cache.

net/disk_cache/entry_unittest.cc

 // Copyright (c) 2012 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 "base/basictypes.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/threading/platform_thread.h"
 #include "base/timer.h"
@@ skipping 1984 matching lines @@
 }
 
 TEST_F(DiskCacheEntryTest, MemoryPartialSparseEntry) {
   SetMemoryOnlyMode();
   InitCache();
   PartialSparseEntry();
 }
 
 // Tests that corrupt sparse children are removed automatically.
 TEST_F(DiskCacheEntryTest, CleanupSparseEntry) {
+  SetDirectMode();
   InitCache();
+  cache_impl_->ClearIndexBitmapForTest();

[rvargas (doing something else), 2013/02/12 01:58:33]

why is this needed?

+
   std::string key("the first key");
   disk_cache::Entry* entry;
   ASSERT_EQ(net::OK, CreateEntry(key, &entry));
 
   const int kSize = 4 * 1024;
   scoped_refptr<net::IOBuffer> buf1(new net::IOBuffer(kSize));
   CacheTestFillBuffer(buf1->data(), kSize, false);
 
   const int k1Meg = 1024 * 1024;
   EXPECT_EQ(kSize, WriteSparseData(entry, 8192, buf1, kSize));
@@ skipping 108 matching lines @@
   store->key_len = 800;
   memset(store->key + key.size(), 'k', sizeof(store->key) - key.size());
   entry_impl->entry()->set_modified();
   entry->Close();
 
   // We have a corrupt entry. Now reload it. We should NOT read beyond the
   // allocated buffer here.
   ASSERT_NE(net::OK, OpenEntry(key, &entry));
   DisableIntegrityCheck();
 }