Make sure that net_perftest doesn't leave temporary files.

net/disk_cache/disk_cache_test_util.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.
 
 #ifndef NET_DISK_CACHE_DISK_CACHE_TEST_UTIL_H_
 #define NET_DISK_CACHE_DISK_CACHE_TEST_UTIL_H_
 
 #include <string>
 
+#include "base/file_path.h"
 #include "base/message_loop.h"
 #include "base/task.h"
 
 // Re-creates a given test file inside the cache test folder.
 bool CreateCacheTestFile(const wchar_t* name);
 
 // Deletes all file son the cache.
 bool DeleteCache(const wchar_t* path);
 
 // Gets the path to the cache test folder.
 std::wstring GetCachePath();
 
 // Fills buffer with random values (may contain nulls unless no_nulls is true).
 void CacheTestFillBuffer(char* buffer, size_t len, bool no_nulls);
 
 // Deletes all files matching a pattern.
 // Do not call this function with "*" as search_name.
 bool DeleteFiles(const wchar_t* path, const wchar_t* search_name);
 
 // Generates a random key of up to 200 bytes.
 std::string GenerateKey(bool same_length);
 
 // Returns true if the cache is not corrupt.
 bool CheckCacheIntegrity(const std::wstring& path);
 
+// Helper class which ensures that the cache dir returned by GetCachePath exists
+// and is clear in ctor and that the directory gets deleted in dtor.
+class ScopedTestCache {
+ public:
+  ScopedTestCache();
+  ~ScopedTestCache();
+
+  FilePath path() const { return FilePath::FromWStringHack(path_); }
+  std::wstring path_wstring() const { return path_; }
+
+ private:
+  const std::wstring path_;  // Path to the cache test folder.
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedTestCache);
+};
+
 // -----------------------------------------------------------------------
 
 // Simple callback to process IO completions from the cache.
 class CallbackTest : public CallbackRunner< Tuple1<int> >  {
  public:
   explicit CallbackTest(int id) : id_(id), reuse_(0) {}
   explicit CallbackTest(int id, bool reuse) : id_(id), reuse_(reuse ? 0 : 1) {}
   ~CallbackTest() {}
 
   virtual void RunWithParams(const Tuple1<int>& params);
@@ skipping 29 matching lines @@
   base::RepeatingTimer<MessageLoopHelper> timer_;
   int num_callbacks_;
   int num_iterations_;
   int last_;
   bool completed_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageLoopHelper);
 };
 
 #endif  // NET_DISK_CACHE_DISK_CACHE_TEST_UTIL_H_